diff --git a/apps/testing/composer/composer/autoload_classmap.php b/apps/testing/composer/composer/autoload_classmap.php
index 83d1fc771fc88..e7f1ce7446640 100644
--- a/apps/testing/composer/composer/autoload_classmap.php
+++ b/apps/testing/composer/composer/autoload_classmap.php
@@ -12,6 +12,7 @@
     'OCA\\Testing\\Controller\\ConfigController' => $baseDir . '/../lib/Controller/ConfigController.php',
     'OCA\\Testing\\Controller\\LockingController' => $baseDir . '/../lib/Controller/LockingController.php',
     'OCA\\Testing\\Controller\\RateLimitTestController' => $baseDir . '/../lib/Controller/RateLimitTestController.php',
+    'OCA\\Testing\\Conversion\\ConversionProvider' => $baseDir . '/../lib/Conversion/ConversionProvider.php',
     'OCA\\Testing\\Listener\\GetDeclarativeSettingsValueListener' => $baseDir . '/../lib/Listener/GetDeclarativeSettingsValueListener.php',
     'OCA\\Testing\\Listener\\RegisterDeclarativeSettingsListener' => $baseDir . '/../lib/Listener/RegisterDeclarativeSettingsListener.php',
     'OCA\\Testing\\Listener\\SetDeclarativeSettingsValueListener' => $baseDir . '/../lib/Listener/SetDeclarativeSettingsValueListener.php',
diff --git a/apps/testing/composer/composer/autoload_static.php b/apps/testing/composer/composer/autoload_static.php
index 3dc4bfe2fd623..f87a822aaf2fc 100644
--- a/apps/testing/composer/composer/autoload_static.php
+++ b/apps/testing/composer/composer/autoload_static.php
@@ -27,6 +27,7 @@ class ComposerStaticInitTesting
         'OCA\\Testing\\Controller\\ConfigController' => __DIR__ . '/..' . '/../lib/Controller/ConfigController.php',
         'OCA\\Testing\\Controller\\LockingController' => __DIR__ . '/..' . '/../lib/Controller/LockingController.php',
         'OCA\\Testing\\Controller\\RateLimitTestController' => __DIR__ . '/..' . '/../lib/Controller/RateLimitTestController.php',
+        'OCA\\Testing\\Conversion\\ConversionProvider' => __DIR__ . '/..' . '/../lib/Conversion/ConversionProvider.php',
         'OCA\\Testing\\Listener\\GetDeclarativeSettingsValueListener' => __DIR__ . '/..' . '/../lib/Listener/GetDeclarativeSettingsValueListener.php',
         'OCA\\Testing\\Listener\\RegisterDeclarativeSettingsListener' => __DIR__ . '/..' . '/../lib/Listener/RegisterDeclarativeSettingsListener.php',
         'OCA\\Testing\\Listener\\SetDeclarativeSettingsValueListener' => __DIR__ . '/..' . '/../lib/Listener/SetDeclarativeSettingsValueListener.php',
diff --git a/apps/testing/lib/AppInfo/Application.php b/apps/testing/lib/AppInfo/Application.php
index 3502b78402e2a..faf25b563fd55 100644
--- a/apps/testing/lib/AppInfo/Application.php
+++ b/apps/testing/lib/AppInfo/Application.php
@@ -7,6 +7,7 @@
 namespace OCA\Testing\AppInfo;
 
 use OCA\Testing\AlternativeHomeUserBackend;
+use OCA\Testing\Conversion\ConversionProvider;
 use OCA\Testing\Listener\GetDeclarativeSettingsValueListener;
 use OCA\Testing\Listener\RegisterDeclarativeSettingsListener;
 use OCA\Testing\Listener\SetDeclarativeSettingsValueListener;
@@ -49,6 +50,8 @@ public function register(IRegistrationContext $context): void {
 		$context->registerTaskProcessingProvider(FakeTranscribeProvider::class);
 		$context->registerTaskProcessingProvider(FakeContextWriteProvider::class);
 
+		$context->registerConversionProvider(ConversionProvider::class);
+
 		$context->registerDeclarativeSettings(DeclarativeSettingsForm::class);
 		$context->registerEventListener(DeclarativeSettingsRegisterFormEvent::class, RegisterDeclarativeSettingsListener::class);
 		$context->registerEventListener(DeclarativeSettingsGetValueEvent::class, GetDeclarativeSettingsValueListener::class);
diff --git a/apps/testing/lib/Conversion/ConversionProvider.php b/apps/testing/lib/Conversion/ConversionProvider.php
new file mode 100644
index 0000000000000..668736e906888
--- /dev/null
+++ b/apps/testing/lib/Conversion/ConversionProvider.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Testing\Conversion;
+
+use OCP\Conversion\ConversionMimeTuple;
+use OCP\Conversion\IConversionProvider;
+use OCP\Files\File;
+
+class ConversionProvider implements IConversionProvider {
+
+	public function getName(): string {
+		return 'testing';
+	}
+
+	public function getSupportedMimeTypes(): array {
+		$jpegConversions = new ConversionMimeTuple('image/jpeg', [
+			'image/png',
+		]);
+
+		return [$jpegConversions];
+	}
+
+	public function convertFile(File $file, string $targetMimeType): mixed {
+		$image = imagecreatefromstring($file->getContent());
+
+		imagepalettetotruecolor($image);
+
+		ob_start();
+		imagepng($image);
+		return ob_get_clean();
+	}
+}
diff --git a/core/Controller/ConversionApiController.php b/core/Controller/ConversionApiController.php
new file mode 100644
index 0000000000000..df2399798be5c
--- /dev/null
+++ b/core/Controller/ConversionApiController.php
@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+
+namespace OC\Core\Controller;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Attribute\ApiRoute;
+use OCP\AppFramework\Http\Attribute\NoAdminRequired;
+use OCP\AppFramework\Http\Attribute\UserRateLimit;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCS\OCSException;
+use OCP\AppFramework\OCS\OCSNotFoundException;
+use OCP\AppFramework\OCSController;
+use OCP\Conversion\IConversionManager;
+use OCP\Files\File;
+use OCP\Files\IRootFolder;
+use OCP\IRequest;
+
+class ConversionApiController extends OCSController {
+	public function __construct(
+		string $appName,
+		IRequest $request,
+		private IConversionManager $conversionManager,
+		private IRootFolder $rootFolder,
+		private ?string $userId,
+	) {
+		parent::__construct($appName, $request);
+	}
+
+	/**
+	 * Converts a file from one MIME type to another
+	 *
+	 * @param int $fileId ID of the file to be converted
+	 * @param string $targetMimeType The MIME type to which you want to convert the file
+	 * @param string|null $destination The target path of the converted file. Written to a temporary file if left empty
+	 *
+	 * @return DataResponse<Http::STATUS_CREATED, array{path: string}, array{}>
+	 *
+	 * 201: File was converted and written to the destination or temporary file
+	 *
+	 * @throws OCSException The file was unable to be converted
+	 * @throws OCSNotFoundException The file to be converted was not found
+	 */
+	#[NoAdminRequired]
+	#[UserRateLimit(limit: 25, period: 120)]
+	#[ApiRoute(verb: 'POST', url: '/convert', root: '/conversion')]
+	public function convert(int $fileId, string $targetMimeType, ?string $destination = null): DataResponse {
+		$userFolder = $this->rootFolder->getUserFolder($this->userId);
+		$file = $userFolder->getFirstNodeById($fileId);
+
+		if (!($file instanceof File)) {
+			throw new OCSNotFoundException();
+		}
+
+		try {
+			if ($destination !== null) {
+				$destination = $userFolder->getFullpath($destination);
+			}
+
+			$convertedFile = $this->conversionManager->convert($file, $targetMimeType, $destination);
+		} catch (\Exception $e) {
+			throw new OCSException($e->getMessage());
+		}
+
+		return new DataResponse([
+			'path' => $convertedFile,
+		], Http::STATUS_CREATED);
+	}
+}
diff --git a/core/openapi-full.json b/core/openapi-full.json
index d6f9837b1c602..24e466a4f9679 100644
--- a/core/openapi-full.json
+++ b/core/openapi-full.json
@@ -2535,6 +2535,133 @@
                 }
             }
         },
+        "/ocs/v2.php/conversion/convert": {
+            "post": {
+                "operationId": "conversion_api-convert",
+                "summary": "Converts a file from one MIME type to another",
+                "tags": [
+                    "conversion_api"
+                ],
+                "security": [
+                    {
+                        "bearer_auth": []
+                    },
+                    {
+                        "basic_auth": []
+                    }
+                ],
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "type": "object",
+                                "required": [
+                                    "fileId",
+                                    "targetMimeType"
+                                ],
+                                "properties": {
+                                    "fileId": {
+                                        "type": "integer",
+                                        "format": "int64",
+                                        "description": "ID of the file to be converted"
+                                    },
+                                    "targetMimeType": {
+                                        "type": "string",
+                                        "description": "The MIME type to which you want to convert the file"
+                                    },
+                                    "destination": {
+                                        "type": "string",
+                                        "nullable": true,
+                                        "description": "The target path of the converted file. Written to a temporary file if left empty"
+                                    }
+                                }
+                            }
+                        }
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "OCS-APIRequest",
+                        "in": "header",
+                        "description": "Required to be true for the API request to pass",
+                        "required": true,
+                        "schema": {
+                            "type": "boolean",
+                            "default": true
+                        }
+                    }
+                ],
+                "responses": {
+                    "201": {
+                        "description": "File was converted and written to the destination or temporary file",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {
+                                                    "type": "object",
+                                                    "required": [
+                                                        "path"
+                                                    ],
+                                                    "properties": {
+                                                        "path": {
+                                                            "type": "string"
+                                                        }
+                                                    }
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "The file to be converted was not found",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {}
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
         "/ocs/v2.php/hovercard/v1/{userId}": {
             "get": {
                 "operationId": "hover_card-get-user",
diff --git a/core/openapi.json b/core/openapi.json
index bf8f2478fbda5..a51e845351c9a 100644
--- a/core/openapi.json
+++ b/core/openapi.json
@@ -2535,6 +2535,133 @@
                 }
             }
         },
+        "/ocs/v2.php/conversion/convert": {
+            "post": {
+                "operationId": "conversion_api-convert",
+                "summary": "Converts a file from one MIME type to another",
+                "tags": [
+                    "conversion_api"
+                ],
+                "security": [
+                    {
+                        "bearer_auth": []
+                    },
+                    {
+                        "basic_auth": []
+                    }
+                ],
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "type": "object",
+                                "required": [
+                                    "fileId",
+                                    "targetMimeType"
+                                ],
+                                "properties": {
+                                    "fileId": {
+                                        "type": "integer",
+                                        "format": "int64",
+                                        "description": "ID of the file to be converted"
+                                    },
+                                    "targetMimeType": {
+                                        "type": "string",
+                                        "description": "The MIME type to which you want to convert the file"
+                                    },
+                                    "destination": {
+                                        "type": "string",
+                                        "nullable": true,
+                                        "description": "The target path of the converted file. Written to a temporary file if left empty"
+                                    }
+                                }
+                            }
+                        }
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "OCS-APIRequest",
+                        "in": "header",
+                        "description": "Required to be true for the API request to pass",
+                        "required": true,
+                        "schema": {
+                            "type": "boolean",
+                            "default": true
+                        }
+                    }
+                ],
+                "responses": {
+                    "201": {
+                        "description": "File was converted and written to the destination or temporary file",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {
+                                                    "type": "object",
+                                                    "required": [
+                                                        "path"
+                                                    ],
+                                                    "properties": {
+                                                        "path": {
+                                                            "type": "string"
+                                                        }
+                                                    }
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "The file to be converted was not found",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {}
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
         "/ocs/v2.php/hovercard/v1/{userId}": {
             "get": {
                 "operationId": "hover_card-get-user",
diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index fd5d9e62ba63e..48c3e9c70dbc7 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -264,6 +264,9 @@
     'OCP\\Contacts\\ContactsMenu\\IProvider' => $baseDir . '/lib/public/Contacts/ContactsMenu/IProvider.php',
     'OCP\\Contacts\\Events\\ContactInteractedWithEvent' => $baseDir . '/lib/public/Contacts/Events/ContactInteractedWithEvent.php',
     'OCP\\Contacts\\IManager' => $baseDir . '/lib/public/Contacts/IManager.php',
+    'OCP\\Conversion\\ConversionMimeTuple' => $baseDir . '/lib/public/Conversion/ConversionMimeTuple.php',
+    'OCP\\Conversion\\IConversionManager' => $baseDir . '/lib/public/Conversion/IConversionManager.php',
+    'OCP\\Conversion\\IConversionProvider' => $baseDir . '/lib/public/Conversion/IConversionProvider.php',
     'OCP\\DB\\Events\\AddMissingColumnsEvent' => $baseDir . '/lib/public/DB/Events/AddMissingColumnsEvent.php',
     'OCP\\DB\\Events\\AddMissingIndicesEvent' => $baseDir . '/lib/public/DB/Events/AddMissingIndicesEvent.php',
     'OCP\\DB\\Events\\AddMissingPrimaryKeyEvent' => $baseDir . '/lib/public/DB/Events/AddMissingPrimaryKeyEvent.php',
@@ -1166,6 +1169,7 @@
     'OC\\Contacts\\ContactsMenu\\Providers\\EMailProvider' => $baseDir . '/lib/private/Contacts/ContactsMenu/Providers/EMailProvider.php',
     'OC\\Contacts\\ContactsMenu\\Providers\\LocalTimeProvider' => $baseDir . '/lib/private/Contacts/ContactsMenu/Providers/LocalTimeProvider.php',
     'OC\\Contacts\\ContactsMenu\\Providers\\ProfileProvider' => $baseDir . '/lib/private/Contacts/ContactsMenu/Providers/ProfileProvider.php',
+    'OC\\Conversion\\ConversionManager' => $baseDir . '/lib/private/Conversion/ConversionManager.php',
     'OC\\Core\\Application' => $baseDir . '/core/Application.php',
     'OC\\Core\\BackgroundJobs\\BackgroundCleanupUpdaterBackupsJob' => $baseDir . '/core/BackgroundJobs/BackgroundCleanupUpdaterBackupsJob.php',
     'OC\\Core\\BackgroundJobs\\CheckForUserCertificates' => $baseDir . '/core/BackgroundJobs/CheckForUserCertificates.php',
@@ -1304,6 +1308,7 @@
     'OC\\Core\\Controller\\ClientFlowLoginV2Controller' => $baseDir . '/core/Controller/ClientFlowLoginV2Controller.php',
     'OC\\Core\\Controller\\CollaborationResourcesController' => $baseDir . '/core/Controller/CollaborationResourcesController.php',
     'OC\\Core\\Controller\\ContactsMenuController' => $baseDir . '/core/Controller/ContactsMenuController.php',
+    'OC\\Core\\Controller\\ConversionApiController' => $baseDir . '/core/Controller/ConversionApiController.php',
     'OC\\Core\\Controller\\CssController' => $baseDir . '/core/Controller/CssController.php',
     'OC\\Core\\Controller\\ErrorController' => $baseDir . '/core/Controller/ErrorController.php',
     'OC\\Core\\Controller\\GuestAvatarController' => $baseDir . '/core/Controller/GuestAvatarController.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index d9af7846bd882..20d16969e37b8 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -313,6 +313,9 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\Contacts\\ContactsMenu\\IProvider' => __DIR__ . '/../../..' . '/lib/public/Contacts/ContactsMenu/IProvider.php',
         'OCP\\Contacts\\Events\\ContactInteractedWithEvent' => __DIR__ . '/../../..' . '/lib/public/Contacts/Events/ContactInteractedWithEvent.php',
         'OCP\\Contacts\\IManager' => __DIR__ . '/../../..' . '/lib/public/Contacts/IManager.php',
+        'OCP\\Conversion\\ConversionMimeTuple' => __DIR__ . '/../../..' . '/lib/public/Conversion/ConversionMimeTuple.php',
+        'OCP\\Conversion\\IConversionManager' => __DIR__ . '/../../..' . '/lib/public/Conversion/IConversionManager.php',
+        'OCP\\Conversion\\IConversionProvider' => __DIR__ . '/../../..' . '/lib/public/Conversion/IConversionProvider.php',
         'OCP\\DB\\Events\\AddMissingColumnsEvent' => __DIR__ . '/../../..' . '/lib/public/DB/Events/AddMissingColumnsEvent.php',
         'OCP\\DB\\Events\\AddMissingIndicesEvent' => __DIR__ . '/../../..' . '/lib/public/DB/Events/AddMissingIndicesEvent.php',
         'OCP\\DB\\Events\\AddMissingPrimaryKeyEvent' => __DIR__ . '/../../..' . '/lib/public/DB/Events/AddMissingPrimaryKeyEvent.php',
@@ -1215,6 +1218,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Contacts\\ContactsMenu\\Providers\\EMailProvider' => __DIR__ . '/../../..' . '/lib/private/Contacts/ContactsMenu/Providers/EMailProvider.php',
         'OC\\Contacts\\ContactsMenu\\Providers\\LocalTimeProvider' => __DIR__ . '/../../..' . '/lib/private/Contacts/ContactsMenu/Providers/LocalTimeProvider.php',
         'OC\\Contacts\\ContactsMenu\\Providers\\ProfileProvider' => __DIR__ . '/../../..' . '/lib/private/Contacts/ContactsMenu/Providers/ProfileProvider.php',
+        'OC\\Conversion\\ConversionManager' => __DIR__ . '/../../..' . '/lib/private/Conversion/ConversionManager.php',
         'OC\\Core\\Application' => __DIR__ . '/../../..' . '/core/Application.php',
         'OC\\Core\\BackgroundJobs\\BackgroundCleanupUpdaterBackupsJob' => __DIR__ . '/../../..' . '/core/BackgroundJobs/BackgroundCleanupUpdaterBackupsJob.php',
         'OC\\Core\\BackgroundJobs\\CheckForUserCertificates' => __DIR__ . '/../../..' . '/core/BackgroundJobs/CheckForUserCertificates.php',
@@ -1353,6 +1357,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Core\\Controller\\ClientFlowLoginV2Controller' => __DIR__ . '/../../..' . '/core/Controller/ClientFlowLoginV2Controller.php',
         'OC\\Core\\Controller\\CollaborationResourcesController' => __DIR__ . '/../../..' . '/core/Controller/CollaborationResourcesController.php',
         'OC\\Core\\Controller\\ContactsMenuController' => __DIR__ . '/../../..' . '/core/Controller/ContactsMenuController.php',
+        'OC\\Core\\Controller\\ConversionApiController' => __DIR__ . '/../../..' . '/core/Controller/ConversionApiController.php',
         'OC\\Core\\Controller\\CssController' => __DIR__ . '/../../..' . '/core/Controller/CssController.php',
         'OC\\Core\\Controller\\ErrorController' => __DIR__ . '/../../..' . '/core/Controller/ErrorController.php',
         'OC\\Core\\Controller\\GuestAvatarController' => __DIR__ . '/../../..' . '/core/Controller/GuestAvatarController.php',
diff --git a/lib/private/AppFramework/Bootstrap/RegistrationContext.php b/lib/private/AppFramework/Bootstrap/RegistrationContext.php
index f3b612edc38bb..8790caf253626 100644
--- a/lib/private/AppFramework/Bootstrap/RegistrationContext.php
+++ b/lib/private/AppFramework/Bootstrap/RegistrationContext.php
@@ -153,6 +153,9 @@ class RegistrationContext {
 
 	/** @var ServiceRegistration<\OCP\TaskProcessing\ITaskType>[] */
 	private array $taskProcessingTaskTypes = [];
+
+	/** @var ServiceRegistration<\OCP\Conversion\IConversionProvider>[] */
+	private array $conversionProviders = [];
 	
 	/** @var ServiceRegistration<IMailProvider>[] */
 	private $mailProviders = [];
@@ -420,6 +423,13 @@ public function registerTaskProcessingTaskType(string $taskProcessingTaskTypeCla
 				);
 			}
 
+			public function registerConversionProvider(string $conversionProviderClass): void {
+				$this->context->registerConversionProvider(
+					$this->appId,
+					$conversionProviderClass
+				);
+			}
+
 			public function registerMailProvider(string $class): void {
 				$this->context->registerMailProvider(
 					$this->appId,
@@ -625,6 +635,14 @@ public function registerTaskProcessingProvider(string $appId, string $taskProces
 	public function registerTaskProcessingTaskType(string $appId, string $taskProcessingTaskTypeClass) {
 		$this->taskProcessingTaskTypes[] = new ServiceRegistration($appId, $taskProcessingTaskTypeClass);
 	}
+
+	/**
+	 * @psalm-param class-string<\OCP\Conversion\IConversionProvider> $conversionProviderClass
+	 */
+	public function registerConversionProvider(string $appId, string $conversionProviderClass): void {
+		$this->conversionProviders[] = new ServiceRegistration($appId, $conversionProviderClass);
+	}
+
 	/**
 	 * @psalm-param class-string<IMailProvider> $migratorClass
 	 */
@@ -984,6 +1002,13 @@ public function getTaskProcessingTaskTypes(): array {
 		return $this->taskProcessingTaskTypes;
 	}
 
+	/**
+	 * @return ServiceRegistration<\OCP\Conversion\IConversionProvider>[]
+	 */
+	public function getConversionProviders(): array {
+		return $this->conversionProviders;
+	}
+
 	/**
 	 * @return ServiceRegistration<IMailProvider>[]
 	 */
diff --git a/lib/private/CapabilitiesManager.php b/lib/private/CapabilitiesManager.php
index d7bf25f078ac0..07076d9aacd80 100644
--- a/lib/private/CapabilitiesManager.php
+++ b/lib/private/CapabilitiesManager.php
@@ -32,7 +32,7 @@ public function __construct(LoggerInterface $logger) {
 	}
 
 	/**
-	 * Get an array of al the capabilities that are registered at this manager
+	 * Get an array of all the capabilities that are registered at this manager
 	 *
 	 * @param bool $public get public capabilities only
 	 * @throws \InvalidArgumentException
diff --git a/lib/private/Conversion/ConversionManager.php b/lib/private/Conversion/ConversionManager.php
new file mode 100644
index 0000000000000..0dff801a02150
--- /dev/null
+++ b/lib/private/Conversion/ConversionManager.php
@@ -0,0 +1,115 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Conversion;
+
+use OC\AppFramework\Bootstrap\Coordinator;
+use OCP\Conversion\ConversionMimeTuple;
+use OCP\Conversion\IConversionManager;
+use OCP\Conversion\IConversionProvider;
+use OCP\Files\File;
+use OCP\Files\IRootFolder;
+use OCP\ITempManager;
+use OCP\PreConditionNotMetException;
+use Psr\Container\ContainerExceptionInterface;
+use Psr\Container\ContainerInterface;
+use Psr\Container\NotFoundExceptionInterface;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Throwable;
+
+class ConversionManager implements IConversionManager {
+	/** @var ?IConversionProvider[] */
+	private ?array $providers = null;
+
+	public function __construct(
+		private Coordinator $coordinator,
+		private ContainerInterface $serverContainer,
+		private IRootFolder $rootFolder,
+		private ITempManager $tempManager,
+		private LoggerInterface $logger,
+	) {
+	}
+
+	public function hasProviders(): bool {
+		$context = $this->coordinator->getRegistrationContext();
+		return !empty($context->getConversionProviders());
+	}
+
+	public function getMimeTypes(): array {
+		$mimeTypes = [];
+
+		foreach ($this->getProviders() as $provider) {
+			$mimeTypes[] = $provider->getSupportedMimeTypes();
+		}
+
+		return $mimeTypes;
+	}
+
+	public function convert(File $file, string $targetMimeType, ?string $destination = null): string {
+		if (!$this->hasProviders()) {
+			throw new PreConditionNotMetException('No conversion providers available');
+		}
+
+		$fileMimeType = $file->getMimetype();
+		foreach ($this->getProviders() as $provider) {
+			$availableProviderConversions = array_filter(
+				$provider->getSupportedMimeTypes(),
+				function (ConversionMimeTuple $mimeTuple) use ($fileMimeType, $targetMimeType) {
+					['from' => $from, 'to' => $to] = $mimeTuple->jsonSerialize();
+
+					return $from === $fileMimeType && in_array($targetMimeType, $to);
+				}
+			);
+
+			if (!empty($availableProviderConversions)) {
+				$convertedFile = $provider->convertFile($file, $targetMimeType);
+
+				if ($destination !== null) {
+					$convertedFile = $this->writeToDestination($destination, $convertedFile);
+					return $convertedFile->getInternalPath();
+				}
+
+				$tmp = $this->tempManager->getTemporaryFile();
+				file_put_contents($tmp, $convertedFile);
+
+				return $tmp;
+			}
+		}
+
+		throw new RuntimeException('Could not convert file');
+	}
+
+	public function getProviders(): array {
+		if ($this->providers !== null) {
+			return $this->providers;
+		}
+
+		$context = $this->coordinator->getRegistrationContext();
+		$this->providers = [];
+
+		foreach ($context->getConversionProviders() as $providerRegistration) {
+			$class = $providerRegistration->getService();
+
+			try {
+				$this->providers[$class] = $this->serverContainer->get($class);
+			} catch (NotFoundExceptionInterface|ContainerExceptionInterface|Throwable $e) {
+				$this->logger->error('Failed to load conversion provider ' . $class, [
+					'exception' => $e,
+				]);
+			}
+		}
+
+		return $this->providers;
+	}
+
+	private function writeToDestination(string $destination, mixed $content): File {
+		return $this->rootFolder->newFile($destination, $content);
+	}
+}
diff --git a/lib/private/OCS/CoreCapabilities.php b/lib/private/OCS/CoreCapabilities.php
index 3d988a8662e76..f67d853dd5dc1 100644
--- a/lib/private/OCS/CoreCapabilities.php
+++ b/lib/private/OCS/CoreCapabilities.php
@@ -8,6 +8,7 @@
 namespace OC\OCS;
 
 use OCP\Capabilities\ICapability;
+use OCP\Conversion\IConversionManager;
 use OCP\IConfig;
 use OCP\IURLGenerator;
 
@@ -22,6 +23,7 @@ class CoreCapabilities implements ICapability {
 	 */
 	public function __construct(
 		private IConfig $config,
+		private IConversionManager $conversionManager,
 	) {
 	}
 
@@ -34,6 +36,7 @@ public function __construct(
 	 *         webdav-root: string,
 	 *         reference-api: boolean,
 	 *         reference-regex: string,
+	 *     	   conversions: array<string, string|array<string>>,
 	 *         mod-rewrite-working: boolean,
 	 *     },
 	 * }
@@ -45,6 +48,7 @@ public function getCapabilities(): array {
 				'webdav-root' => $this->config->getSystemValueString('webdav-root', 'remote.php/webdav'),
 				'reference-api' => true,
 				'reference-regex' => IURLGenerator::URL_REGEX_NO_MODIFIERS,
+				'conversions' => array_merge([], ...$this->conversionManager->getMimeTypes()),
 				'mod-rewrite-working' => $this->config->getSystemValueBool('htaccess.IgnoreFrontController') || getenv('front_controller_active') === 'true',
 			],
 		];
diff --git a/lib/private/Server.php b/lib/private/Server.php
index a20c37732a76e..99bfe14b08440 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -34,6 +34,7 @@
 use OC\Comments\ManagerFactory as CommentsManagerFactory;
 use OC\Contacts\ContactsMenu\ActionFactory;
 use OC\Contacts\ContactsMenu\ContactsStore;
+use OC\Conversion\ConversionManager;
 use OC\DB\Connection;
 use OC\DB\ConnectionAdapter;
 use OC\Diagnostics\EventLogger;
@@ -143,6 +144,7 @@
 use OCP\Comments\ICommentsManager;
 use OCP\Contacts\ContactsMenu\IActionFactory;
 use OCP\Contacts\ContactsMenu\IContactsStore;
+use OCP\Conversion\IConversionManager;
 use OCP\Defaults;
 use OCP\Diagnostics\IEventLogger;
 use OCP\Diagnostics\IQueryLogger;
@@ -1006,7 +1008,10 @@ public function __construct($webRoot, \OC\Config $config) {
 		$this->registerService(CapabilitiesManager::class, function (ContainerInterface $c) {
 			$manager = new CapabilitiesManager($c->get(LoggerInterface::class));
 			$manager->registerCapability(function () use ($c) {
-				return new \OC\OCS\CoreCapabilities($c->get(\OCP\IConfig::class));
+				return new \OC\OCS\CoreCapabilities(
+					$c->get(\OCP\IConfig::class),
+					$c->get(\OCP\Conversion\IConversionManager::class)
+				);
 			});
 			$manager->registerCapability(function () use ($c) {
 				return $c->get(\OC\Security\Bruteforce\Capabilities::class);
@@ -1258,6 +1263,8 @@ public function __construct($webRoot, \OC\Config $config) {
 
 		$this->registerAlias(ITranslationManager::class, TranslationManager::class);
 
+		$this->registerAlias(IConversionManager::class, ConversionManager::class);
+
 		$this->registerAlias(ISpeechToTextManager::class, SpeechToTextManager::class);
 
 		$this->registerAlias(IEventSourceFactory::class, EventSourceFactory::class);
diff --git a/lib/public/AppFramework/Bootstrap/IRegistrationContext.php b/lib/public/AppFramework/Bootstrap/IRegistrationContext.php
index 8a18ec8ae9da0..6a3ed93f12a83 100644
--- a/lib/public/AppFramework/Bootstrap/IRegistrationContext.php
+++ b/lib/public/AppFramework/Bootstrap/IRegistrationContext.php
@@ -414,6 +414,19 @@ public function registerTaskProcessingProvider(string $taskProcessingProviderCla
 	 */
 	public function registerTaskProcessingTaskType(string $taskProcessingTaskTypeClass): void;
 
+	/**
+	 * Register an implementation of \OCP\Conversion\IConversionProvider
+	 * that will handle the conversion of files from one MIME type to another
+	 *
+	 * @param string $conversionProviderClass
+	 * @psalm-param class-string<\OCP\Conversion\IConversionProvider> $conversionProviderClass
+	 *
+	 * @return void
+	 *
+	 * @since 31.0.0
+	 */
+	public function registerConversionProvider(string $conversionProviderClass): void;
+
 	/**
 	 * Register a mail provider
 	 *
diff --git a/lib/public/Conversion/ConversionMimeTuple.php b/lib/public/Conversion/ConversionMimeTuple.php
new file mode 100644
index 0000000000000..59aefc585252d
--- /dev/null
+++ b/lib/public/Conversion/ConversionMimeTuple.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\Conversion;
+
+use JsonSerializable;
+
+/**
+ * A tuple-like object representing both an original and target
+ * MIME type for a file conversion
+ *
+ * @since 31.0.0
+ */
+class ConversionMimeTuple implements JsonSerializable {
+	/**
+	 * @param string $from The original MIME type of a file
+	 * @param array<string> $to The desired MIME type for the file
+	 *
+	 * @since 31.0.0
+	 */
+	public function __construct(
+		private string $from,
+		private array $to,
+	) {
+	}
+
+	public function jsonSerialize(): array {
+		return [
+			'from' => $this->from,
+			'to' => $this->to,
+		];
+	}
+}
diff --git a/lib/public/Conversion/IConversionManager.php b/lib/public/Conversion/IConversionManager.php
new file mode 100644
index 0000000000000..179e33b458277
--- /dev/null
+++ b/lib/public/Conversion/IConversionManager.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\Conversion;
+
+use OCP\Files\File;
+
+/**
+ * @since 31.0.0
+ */
+interface IConversionManager {
+	/**
+	 * Determines whether or not conversion providers are available
+	 *
+	 * @return bool
+	 *
+	 * @since 31.0.0
+	 */
+	public function hasProviders(): bool;
+
+	/**
+	 * Gets all supported MIME type conversions
+	 *
+	 * @return array<ConversionMimeTuple>
+	 *
+	 * @since 31.0.0
+	 */
+	public function getMimeTypes(): array;
+
+	/**
+	 * Convert a file to a given MIME type
+	 *
+	 * @param File $file The file to be converted
+	 * @param string $targetMimeType The MIME type to convert the file to
+	 * @param ?string $destination The destination to save the converted file
+	 *
+	 * @return string Path to the converted file
+	 *
+	 * @since 31.0.0
+	 */
+	public function convert(File $file, string $targetMimeType, ?string $destination = null): string;
+}
diff --git a/lib/public/Conversion/IConversionProvider.php b/lib/public/Conversion/IConversionProvider.php
new file mode 100644
index 0000000000000..6dfba4f5b6cd2
--- /dev/null
+++ b/lib/public/Conversion/IConversionProvider.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\Conversion;
+
+use OCP\Files\File;
+
+/**
+ * This interface is implemented by apps that provide
+ * a file conversion provider
+ *
+ * @since 31.0.0
+ */
+interface IConversionProvider {
+	/**
+	 * Get the name of the provider
+	 *
+	 * @return string
+	 *
+	 * @since 31.0.0
+	 */
+	public function getName(): string;
+
+	/**
+	 * Get an array of MIME types which are available for conversion
+	 *
+	 * @return array<ConversionMimeTuple>
+	 *
+	 * @since 31.0.0
+	 */
+	public function getSupportedMimeTypes(): array;
+
+	/**
+	 * Convert a file to a given MIME type
+	 *
+	 * @param File $file The file to be converted
+	 * @param string $targetMimeType The MIME type to convert the file to
+	 *
+	 * @return resource|string Resource or string content of the file
+	 *
+	 * @since 31.0.0
+	 */
+	public function convertFile(File $file, string $targetMimeType): mixed;
+}
diff --git a/tests/Core/Controller/ConversionApiControllerTest.php b/tests/Core/Controller/ConversionApiControllerTest.php
new file mode 100644
index 0000000000000..07b797dc51218
--- /dev/null
+++ b/tests/Core/Controller/ConversionApiControllerTest.php
@@ -0,0 +1,90 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Core\Controller;
+
+use OC\Core\Controller\ConversionApiController;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCS\OCSException;
+use OCP\AppFramework\OCS\OCSNotFoundException;
+use OCP\Conversion\IConversionManager;
+use OCP\Files\File;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\IRequest;
+use PHPUnit\Framework\MockObject\MockObject;
+use Test\TestCase;
+
+class ConversionApiControllerTest extends TestCase {
+	/** @var ConversionApiController */
+	private $conversionApiController;
+
+	/** @var IRequest|MockObject */
+	private $request;
+
+	/** @var IConversionManager|MockObject */
+	private $conversionManager;
+
+	/** @var IRootFolder|MockObject */
+	private $rootFolder;
+
+	/** @var File|MockObject */
+	private $file;
+
+	/** @var Folder|MockObject */
+	private $userFolder;
+
+	/** @var string */
+	private $user;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->request = $this->createMock(IRequest::class);
+		$this->conversionManager = $this->createMock(IConversionManager::class);
+		$this->file = $this->createMock(File::class);
+		$this->user = 'userid';
+
+		$this->userFolder = $this->createMock(Folder::class);
+		$this->rootFolder = $this->createMock(IRootFolder::class);
+		$this->rootFolder->method('getUserFolder')->with($this->user)->willReturn($this->userFolder);
+
+		$this->conversionApiController = new ConversionApiController(
+			'core',
+			$this->request,
+			$this->conversionManager,
+			$this->rootFolder,
+			$this->user,
+		);
+	}
+
+	public function testThrowsNotFoundException() {
+		$this->expectException(OCSNotFoundException::class);
+		$this->conversionApiController->convert(42, 'image/png');
+	}
+
+	public function testThrowsOcsException() {
+		$this->userFolder->method('getFirstNodeById')->with(42)->willReturn($this->file);
+		$this->conversionManager->method('convert')->willThrowException(new \Exception());
+
+		$this->expectException(OCSException::class);
+		$this->conversionApiController->convert(42, 'image/png');
+	}
+
+	public function testConvert() {
+		$this->userFolder->method('getFirstNodeById')->with(42)->willReturn($this->file);
+		$this->conversionManager->method('convert')->with($this->file, 'image/png')->willReturn('files/test.png');
+
+		$actual = $this->conversionApiController->convert(42, 'image/png');
+		$expected = new DataResponse([
+			'path' => 'files/test.png',
+		], Http::STATUS_CREATED);
+
+		$this->assertEquals($expected, $actual);
+	}
+}