File Encrypt/Decrypt — Free AES-256 File Encryption Tool
Encrypt and decrypt files with AES-256-GCM — password-based, browser-only, no file uploads.
Drop a file here or click to select
Select any file to encrypt
Frequently Asked Questions
AES-256 File Encryption: Protecting Files at Rest
File encryption protects sensitive files — documents, spreadsheets, archives, images — from unauthorized access. Whether storing files in cloud services, sharing via email, or archiving sensitive data, encryption ensures only those with the password can access the contents.
This tool processes files entirely in your browser — files are never uploaded to any server. The Web Crypto API performs AES-256-GCM encryption locally, and the encrypted file is downloaded directly to your device. Decryption works the same way in reverse.
The encrypted file format includes all necessary metadata (salt and IV) so you don't need to remember separate parameters for decryption. The authentication tag in GCM mode ensures the file hasn't been tampered with. For the best security, use a strong random password (20+ characters) and store it in a password manager.