PepsTools

PDF Tools

Protect PDF

Encrypt a PDF with an open password using AES encryption in the browser.

Uses real AES encryption via a pdf-lib fork. Passwords are not stored. Some older readers may not open AES-256 PDFs.

How to use it

Choose an unencrypted PDF, enter an open password, optionally an owner password, then Process PDF and Download. Passwords are cleared from the form after processing and are never sent to the server.

Example

Encryption is real AES via a pdf-lib fork with Web Crypto. The UI alone is not treated as protection.

Input

notes.pdf with open password secret

Result

notes-protected.pdf that requires the password to open

How it works

The document is encrypted before save. The tool verifies the result reports as encrypted. Default algorithm is AES-256 revision 6. Some older readers cannot open AES-256 PDFs.

Common errors

  • The file was already encrypted Unlock it first, then protect again if you need a new password.
  • A blank password was refused Enter at least one character.
  • An old reader cannot open the file That reader may lack AES-256 support. Try a current viewer.

Limitations

Permissions beyond open/owner passwords are not exposed as a full rights editor. Passwords are limited to 64 characters. Files over 15 MB are refused.

Privacy

The file stays in your browser. PepsTools does not upload it, store it, or send it to another service. Clear the tool or leave the page to drop it from memory.

Questions

Do you store the password?

No. It stays in memory only while the page builds the encrypted download.