Free Online File Encrypt & Decrypt Tool - ATools

Free online file encrypt & decrypt tool: Securely encrypt any file with AES-256-GCM + PBKDF2 locally, export compact binary (.enc) or JSON, and decrypt anytime to restore the original file.

View source on GitHub

Note: This tool uses AES-256-GCM + PBKDF2(SHA-256) to strongly encrypt files locally in your browser. It exports compact binary packages (.enc) with zero size overhead, and supports JSON output and legacy decryption. Pure client-side processing without uploading files.

Drop any file here or click to upload.

Encryption Settings

Password *

Export Format

PBKDF2 Iterations200,000

Default 200,000 rounds. Higher numbers increase brute-force resistance.

Encrypted Output

Select a file and enter password, then click 'Encrypt & Export File'

Encrypted locally in browser using AES-256-GCM. No data leaks.