PDF Lock (Encrypt/Decrypt)
Encrypt and decrypt PDF files locally in your browser using password-based encryption. No uploads.
Privacy-first: this tool runs entirely in your browser. No data leaves your device.
How it works
- Encrypt: your PDF is encrypted in-browser with PBKDF2 (SHA-256) + AES-GCM 256.
- Output: the download is a `.pdf.enc` file with salt, IV, and iteration metadata.
- Decrypt: we reverse the process locally using your password.
- Privacy: files and passwords never leave your device.