Add password protection and encryption to your PDF files. Secure sensitive docs.
Add password encryption to PDF files to protect sensitive documents. Real AES encryption applied on our secure engine — your PDF is deleted immediately after.
Upload your file using the tool above.
Adjust any settings to your preference.
Click the process button and wait for results.
Download your output using the download button.
Real AES encryption — the file contents are genuinely scrambled and cannot be read without the password. That is different from permission flags alone, which merely ask viewers politely not to print or copy and are trivially ignored by software that chooses to.
The document is unrecoverable. There is no backdoor, no reset, and no way for us to help — that is precisely what makes the encryption worth having. Store the password in a password manager before you send the file, and never rely on remembering it.
Through a different channel from the file. Emailing an encrypted PDF and its password in the same message defeats the point entirely, since anyone reading that inbox has both. Send the document by email and the password by phone, text or a separate messaging app.
Yes, PDF Password Protector is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.
PDF Password Protector uploads your file over an encrypted connection to our own processing server, converts it, and returns the result. The file is deleted immediately after processing and is never used for anything else. It is not sent to any third party, and we keep no copies.
Drop a PDF to protect
Add a password to restrict access
Drop your file into the stage to begin.
How it works: Your PDF is encrypted with industry-standard AES-256 encryption. The password you set is required to open the document in any PDF reader. Files are processed securely and never stored.
Password strength: A strong password should be at least 8 characters long, include uppercase and lowercase letters, numbers, and at least one special character (like ! @ # $). Avoid dictionary words.
Best practices: Never include the password in the same email or message as the protected file. Share the password through a separate, secure channel.