diff --git a/__tests__/fileAction.spec.ts b/__tests__/fileAction.spec.ts
new file mode 100644
index 00000000..6f73dc52
--- /dev/null
+++ b/__tests__/fileAction.spec.ts
@@ -0,0 +1,193 @@
+import { getFileActions, registerFileAction, FileAction } from '../lib/fileAction'
+import logger from '../lib/utils/logger';
+
+declare global {
+	interface Window {
+		OC: any;
+		_nc_fileactions: FileAction[];
+	}
+}
+
+describe('FileActions init', () => {
+	test('Getting empty uninitialized FileActions', () => {
+		logger.debug = jest.fn()
+		const fileActions = getFileActions()
+		expect(window._nc_fileactions).toBeUndefined()
+		expect(fileActions).toHaveLength(0)
+		expect(logger.debug).toHaveBeenCalledTimes(0)
+	})
+
+	test('Initializing FileActions', () => {
+		logger.debug = jest.fn()
+		const action = new FileAction({
+			id: 'test',
+			displayName: () => 'Test',
+			iconSvgInline: () => '<svg></svg>',
+			exec: () => true,
+		})
+
+		expect(action.id).toBe('test')
+		expect(action.displayName([])).toBe('Test')
+		expect(action.iconSvgInline([])).toBe('<svg></svg>')
+
+		registerFileAction(action)
+
+		expect(window._nc_fileactions).toHaveLength(1)
+		expect(getFileActions()).toHaveLength(1)
+		expect(getFileActions()[0]).toStrictEqual(action)
+		expect(logger.debug).toHaveBeenCalled()
+	})
+
+	test('Duplicate FileAction gets rejected', () => {
+		logger.error = jest.fn()
+		const action = new FileAction({
+			id: 'test',
+			displayName: () => 'Test',
+			iconSvgInline: () => '<svg></svg>',
+			exec: () => true,
+		})
+
+		registerFileAction(action)
+		expect(getFileActions()).toHaveLength(1)
+		expect(getFileActions()[0]).toStrictEqual(action)
+
+		const action2 = new FileAction({
+			id: 'test',
+			displayName: () => 'Test 2',
+			iconSvgInline: () => '<svg></svg>',
+			exec: () => true,
+		})
+
+		registerFileAction(action2)
+		expect(getFileActions()).toHaveLength(1)
+		expect(getFileActions()[0]).toStrictEqual(action)
+		expect(logger.error).toHaveBeenCalledWith('FileAction test already registered', { action: action2 })
+	})
+})
+
+describe('Invalid FileAction creation', () => {
+	test('Invalid id', () => {
+		expect(() => {
+			new FileAction({
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+			} as any as FileAction)
+		}).toThrowError('Invalid id')
+	})
+	test('Invalid displayName', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+			} as any as FileAction)
+		}).toThrowError('Invalid displayName function')
+	})
+	test('Invalid iconSvgInline', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: '<svg></svg>',
+				exec: () => true,
+			} as any as FileAction)
+		}).toThrowError('Invalid iconSvgInline function')
+	})
+	test('Invalid exec', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: false,
+			} as any as FileAction)
+		}).toThrowError('Invalid exec function')
+	})
+	test('Invalid enabled', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+				enabled: false,
+			} as any as FileAction)
+		}).toThrowError('Invalid enabled function')
+	})
+	test('Invalid execBatch', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+				execBatch: false,
+			} as any as FileAction)
+		}).toThrowError('Invalid execBatch function')
+	})
+	test('Invalid order', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+				order: 'invalid',
+			} as any as FileAction)
+		}).toThrowError('Invalid order')
+	})
+	test('Invalid default', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+				default: 'invalid',
+			} as any as FileAction)
+		}).toThrowError('Invalid default')
+	})
+	test('Invalid inline', () => {
+		expect(() => {
+			new FileAction({
+				id: 'test',
+				displayName: () => 'Test',
+				iconSvgInline: () => '<svg></svg>',
+				exec: () => true,
+				inline: true,
+			} as any as FileAction)
+		}).toThrowError('Invalid inline function')
+	})
+})
+
+describe('FileActions creation', () => {
+	test('create valid FileAction', () => {
+		logger.debug = jest.fn()
+		const action = new FileAction({
+			id: 'test',
+			displayName: () => 'Test',
+			iconSvgInline: () => '<svg></svg>',
+			exec: () => true,
+			execBatch: () => true,
+			enabled: () => true,
+			order: 100,
+			default: true,
+			inline: (mount) => mount.append('test'),
+		})
+
+		const mount = document.createElement('div')
+
+		expect(action.id).toBe('test')
+		expect(action.displayName([])).toBe('Test')
+		expect(action.iconSvgInline([])).toBe('<svg></svg>')
+		expect(action.exec({} as any)).toBe(true)
+		expect(action.execBatch?.([])).toBe(true)
+		expect(action.enabled?.({} as any, {})).toBe(true)
+		expect(action.order).toBe(100)
+		expect(action.default).toBe(true)
+		action.inline?.(mount)
+		expect(mount.innerHTML).toBe('test')
+	})
+})
\ No newline at end of file
diff --git a/lib/fileAction.ts b/lib/fileAction.ts
new file mode 100644
index 00000000..dd1002a3
--- /dev/null
+++ b/lib/fileAction.ts
@@ -0,0 +1,129 @@
+/**
+ * @copyright Copyright (c) 2021 John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+import { Node } from "./files/node"
+import logger from "./utils/logger"
+
+interface FileActionData {
+	/** Unique ID */
+	id: string
+	/** Translatable string displayed in the menu */
+	displayName: (files: Node[]) => string
+	/** Svg as inline string. <svg><path fill="..." /></svg> */
+	iconSvgInline: (files: Node[]) => string
+	// Condition wether this action is shown or not
+	enabled?: (files: Node[], view) => boolean
+	/** Function executed on single file action
+	 * @returns true if the action was executed, false otherwise
+	 * @throws Error if the action failed
+	 */
+	exec: (file: Node) => boolean,
+	/** Function executed on multiple files action
+	 * @returns true if the action was executed, false otherwise
+	 * @throws Error if the action failed
+	 */
+	execBatch?: (files: Node[]) => boolean
+	/** This action order in the list */
+	order?: number,
+	/** Make this action the default */
+	default?: boolean,
+	/** If defined, will provide a mount point
+	 * to render the action inline.
+	 */
+	inline?: (mount: HTMLElement) => void,
+}
+
+// Allow class/interface merging and proxying
+export interface FileAction extends FileActionData {}
+export class FileAction {
+	private _action: FileActionData
+	
+	constructor(action: FileActionData) {
+		this.validateAction(action)
+		this._action = action
+
+		// Forward any getter to action data
+		return new Proxy(this, {
+			get(target, property: string) {
+				return Reflect.get(target._action, property)
+			}
+		})
+	}
+
+	private validateAction(action: FileActionData) {
+		if (!action.id || typeof action.id !== 'string') {
+			throw new Error('Invalid id')
+		}
+
+		if (!action.displayName || typeof action.displayName !== 'function') {
+			throw new Error('Invalid displayName function')
+		}
+
+		if (!action.iconSvgInline || typeof action.iconSvgInline !== 'function') {
+			throw new Error('Invalid iconSvgInline function')
+		}
+
+		if (!action.exec || typeof action.exec !== 'function') {
+			throw new Error('Invalid exec function')
+		}
+
+		// Optional properties --------------------------------------------
+		if ('enabled' in action && typeof action.execBatch !== 'function') {
+			throw new Error('Invalid enabled function')
+		}
+
+		if ('execBatch' in action && typeof action.execBatch !== 'function') {
+			throw new Error('Invalid execBatch function')
+		}
+
+		if ('order' in action && typeof action.order !== 'number') {
+			throw new Error('Invalid order')
+		}
+
+		if ('default' in action && typeof action.default !== 'boolean') {
+			throw new Error('Invalid default')
+		}
+
+		if ('inline' in action && typeof action.inline !== 'function') {
+			throw new Error('Invalid inline function')
+		}
+	}
+}
+
+export const registerFileAction = function(action: FileAction): void {
+	if (typeof window._nc_fileactions === 'undefined') {
+		window._nc_fileactions = []
+		logger.debug('FileActions initialized')
+	}
+
+	// Check duplicates
+	if (window._nc_fileactions.find(search => search.id === action.id)) {
+		logger.error(`FileAction ${action.id} already registered`, { action })
+		return
+	}
+
+	window._nc_fileactions.push(action)
+}
+
+export const getFileActions = function(): FileAction[] {
+	return window._nc_fileactions || []
+}
diff --git a/lib/index.ts b/lib/index.ts
index 8cd3be86..85ca825a 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -23,6 +23,7 @@
 
 export { formatFileSize } from './humanfilesize'
 export { type Entry } from './newFileMenu'
+import { FileAction } from './fileAction'
 import { type Entry, getNewFileMenu, NewFileMenu } from './newFileMenu'
 
 export { FileType } from './files/fileType'
@@ -35,6 +36,7 @@ declare global {
 	interface Window {
 		OC: any;
 		_nc_newfilemenu: NewFileMenu;
+		_nc_fileactions: FileAction[];
 	}
 }