Protect PDF with password
Encrypt your PDF with AES-256.
Process: application/pdf
Process ≤ 50.0 MB
About this tool
Encrypt your PDF with AES-256.
All processing happens in your browser. Your PDF never uploads to our servers. No account required, no usage limits.
Frequently asked questions
Is this PDF password protection free?
Yes, completely free with no usage limits.
How secure is the encryption?
We use AES-128 encryption (PDF 1.6+ standard). For threat models requiring resistance to GPU brute-force, use a strong password with 12+ characters and high entropy.
Will my PDF be uploaded to a server?
No. Encryption happens entirely in your browser — neither we nor anyone else has access to your password or PDF.
Can I recover a forgotten password?
No. There is no recovery mechanism — by design. Anyone (including us) could decrypt your PDF if there were one. Save the password somewhere safe before encrypting.
Does it work offline?
Yes, after the first visit.