Free Online PDF Encrypt & Decrypt Tool - ATools

Free online standard PDF encrypt & decrypt tool: Protect PDF files with standard user & owner passwords (AES-256 / RC4), directly export encrypted .pdf compatible with Acrobat and browsers, and unlock password-protected PDFs.

View source on GitHub

Note: This tool creates standard password-protected PDF files conforming to ISO 32000 (AES-256 and RC4 128-bit). Exported files can be opened with your password in Adobe Acrobat, Edge, Chrome, or any standard PDF reader. All processing happens entirely in your browser locally.

Drop PDF file here or click to upload.

Encryption Options & Permission Protection

Open Password (User Password) *

Owner Password (Optional)

Encryption Standard

Permission Restrictions

Allow printingAllow text and content copyingAllow modifying contentAllow annotations and form filling

Encrypted PDF Output

Select a PDF and set password, then click 'Encrypt & Export PDF'

Generated .pdf files can be opened in Adobe Acrobat or any browser with your password