Documents & PDF tool
Password Protect PDF
Encrypt an unprotected PDF with a password required to open it. Processing stays in your browser using AES-256 encryption.
Your PDF and password stay in this browser. Nothing is uploaded or saved by this tool.
Add a password required to open your PDF
Uses AES-256 encryption. Anyone with the password can open and copy the content; this is not a restriction on printing or editing.
Up to 20 MB to keep browser memory use manageable, especially on phones. Use an unsigned PDF: changing security can invalidate digital signatures.
We cannot recover a forgotten password. Keep your original PDF safely, and send the password separately from the protected file. Password protection does not make a document safe if its password is weak or shared publicly.
Want to protect a photo? Create a PDF from your images first, then select it here. Ordinary JPEG and PNG files do not support a standard opening password.
Processed privately in your browser — your entries are not uploaded.
Good to know
How this tool works
Select an unsigned, unprotected PDF, enter and confirm a strong password, then choose Protect PDF. Download the encrypted copy and test your password before sharing. No account or upload is needed. Keep your original and password safe: we cannot recover them.
Frequently asked questions
What is Password Protect PDF useful for?
Require a password to open a PDF, without uploading your file. Open the downloaded document and check every page, especially page order, clipping and readable text.
Is my information stored?
This tool works in your browser. The information you enter is not sent to us or saved in an account by this tool.
How accurate is the result?
The calculation follows the assumptions shown on the page. Rounding, provider methods and real-world charges can produce small differences.