Are my passwords uploaded?

No. Locking and unlocking run entirely in your browser, so passwords and files never leave your device.

Can you crack a PDF password I forgot?

No. Unlock only works if you already know the password. We cannot recover or brute-force unknown passwords.

AES-256 is the default (recommended). Choose RC4 only if you need compatibility with very old PDF readers.

Yes. Protect and unlock PDFs online for free after you sign in.

The open password restricts who can view the file. An optional owner password can control printing, copying, and editing permissions.

No. Encrypting and decrypting run in your browser and download a standard PDF.

In browser

Lock a PDF with a password or unlock a protected file. Encryption stays in your browser — passwords never leave your device.

Drop a PDF here or click to browse

Unlocked PDF · up to 100 MB

Nothing is uploaded. Passwords and PDFs stay in your browser memory and are discarded when you close or reload the page.

FormatsPDF

Choose Protect or Unlock, pick a PDF, enter the password, then download. Everything runs in your browser tab.

Are my passwords uploaded?: No. Locking and unlocking run entirely in your browser, so passwords and files never leave your device.
Can you crack a PDF password I forgot?: No. Unlock only works if you already know the password. We cannot recover or brute-force unknown passwords.
What encryption is used?: AES-256 is the default (recommended). Choose RC4 only if you need compatibility with very old PDF readers.
Is Secure PDF free?: Yes. Protect and unlock PDFs online for free after you sign in.
What is an owner password?: The open password restricts who can view the file. An optional owner password can control printing, copying, and editing permissions.
Do I need Adobe Acrobat?: No. Encrypting and decrypting run in your browser and download a standard PDF.