Protect PDF - Add Password Protection to PDF Free

Upload your PDF, set a strong password, and download the protected file in seconds.

Yes, it is free forever with no signup required.

It uses standard PDF password encryption, which works with common PDF readers.

Your file is uploaded securely for encryption and automatically deleted after 60 minutes. It is not shared with anyone else.

Use a long password with mixed letters, numbers, and symbols, and store it safely.

Protect contracts, invoices, ID copies, and any PDF with personal or financial details before you email or share it. The password means only people you give it to can open the document. Send the password separately, for example by message, never in the same email.

Renaming a file hides nothing, because anyone can still open it and read every page. Password protection encrypts the PDF, so a reader asks for the password before showing any content. Use a long, unique password with letters, numbers, and symbols for documents that truly matter.

First check Caps Lock, keyboard language, and extra spaces if you pasted the password into the reader. Passwords are case-sensitive, so a single changed character will block the file. If it still fails, protect a fresh copy from your original PDF and note the new password carefully.

There is no recovery option for a forgotten PDF password, and the protected file cannot be opened without it. Keep your original unprotected PDF somewhere safe as a backup. Storing the password in a password manager also prevents being locked out of your own documents.

Protect your PDF last, after merging, compressing, or editing is completely finished. A protected file often cannot be merged or changed until it is unlocked again, which adds extra steps. Once the final version is ready, add the password and share that protected copy.