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Lock PDF

Comments Off on Lock PDF | 27/11/2025

Lock PDF Files

Secure your PDF documents with 128-bit AES encryption. Add passwords directly in your browser without uploading files.

Drop PDF to Protect

Encrypt your document instantly

How to password-protect a PDF

Choose a PDF in the lock tool above and follow its available password or security settings. Save the protected output, then close and reopen it in a PDF viewer to confirm the protection works as intended. Store the password separately from the file and share it with authorized recipients through a different secure channel.

Understand password protection and permissions

An opening password can restrict access to a document, while some PDFs also support separate permissions for printing, copying or editing. These controls are not equivalent and may be enforced differently by PDF readers. A password alone is not a substitute for secure storage, careful recipient selection or organizational access policies.

Check the protected file before sharing

Confirm that all pages, text, images and forms remain readable. Changes to a PDF can affect existing digital signatures, so verify signature validity if relevant. Avoid reusing a password from another account, and keep an original copy in a secure location in case a recipient cannot open the protected version.

Frequently asked questions

Will locking a PDF hide its filename? No; filenames and some metadata may remain visible. Can a forgotten password be recovered? Not always, so retain a secure record. Does locking prevent screenshots? No; recipients who can view a document may still capture its contents.