Lock a PDF with a password
Protect a certificate or a filled form before you send it. Whoever opens it will need the password.
🔒 Your PDF is processed on this device. It is never uploaded.
Before you lock
- Do not lock a file you will upload to an exam portal: portals usually reject password-protected PDFs.
- The password cannot be recovered. Keep a copy of the unlocked file.
- “Block printing” and “Block copying” are respected by most PDF readers, but they are not a strong protection on their own.
Need to remove a password? Unlock PDF.