PDF Password Protection and Unlock
Protect files or remove known-password encryption locally.
or drop PDF here ·
Files stay on this device. Nothing is uploaded.PDF
- 1
Choose PDF
Pick PDF from your device or drop them on the page. Type is checked from the file’s bytes, not its name.
- 2
Set options
Enter the password twice. AES-256 is the only method in this pack.
- 3
Save PDF
Processing happens in this tab. You download a new copy; your originals are never changed.
How to use this tool
How it works
- Choose an unencrypted PDF to protect, or an encrypted PDF to unlock.
- Enter the password twice. AES-256 is the only method in this pack.
- Protect must fail to open without the password. Unlock with the wrong password fails.
Passwords stay in this tab. They are never in share URLs.
Wrong password fails. Permission flags are advisory, not DRM. pdf-lib ignoreEncryption is not used.
Supported inputs and outputs
PDF in and out. QPDF WASM AES-256 (AESv3) at /engines/qpdf/.
Example
Protect a one-page PDF; pdf-lib load without a password throws PASSWORD_REQUIRED. Unlock with the same password reopens as %PDF-.
Questions and answers
Can I bypass a password?
No. Only the password you type is tried, on this device.
Related: PDF Technical Inspector