4x Engineer

Unlock PDF

Remove the open password from a PDF when you know the password. Choose your file, type its password and download an unlocked copy. Everything runs in your browser, so your PDF stays on your device and is never uploaded.

  • Free
  • No sign-up
  • Your file never leaves your device

Remove a PDF password

  1. Choose PDF
  2. Enter password
  3. Download

Unlock PDF works inside your browser, so it needs JavaScript and WebAssembly. Please enable JavaScript (or use a current version of Chrome, Edge, Firefox or Safari) and reload this page.

Your PDF and password are processed only in your browser. Nothing is uploaded to 4x Engineer's server.

Use this tool only for PDFs you own or are allowed to unlock.

How to unlock a PDF

  1. Choose your PDF

    Drop the password-protected PDF on the box above, or tap it to pick the file from your device.

  2. Enter the password

    Type the password you use to open the PDF and press Unlock PDF.

  3. Download

    Save the unlocked copy. It opens without a password from now on.

Is it safe? Your file stays on your device

This PDF password remover runs entirely in your web browser. When you choose a file, your browser reads it and a small program (qpdf, built for the browser) decrypts it on your own computer or phone. Your PDF, its name and its password are never uploaded, sent or stored, so you can unlock a PDF without uploading it anywhere. Closing or reloading the page clears everything.

What “unlock” means here

Unlock PDF removes the password protection from a PDF when you enter its correct password, and gives you a decrypted copy that opens without one. It does not recover, guess or crack a forgotten password: if you do not know the password, the file cannot be unlocked with this tool.

Why the result keeps full quality

The tool decrypts the original PDF instead of turning its pages into pictures. Text stays selectable and searchable, and links, fonts, images and the page layout stay exactly as they were in the original file.

Frequently asked questions

Is Unlock PDF free?

Yes. Unlock PDF is free to use, with no sign-up and no account.

Is my PDF uploaded to a server?

No. Your PDF and your password are processed only in your browser, on your own device. Nothing is uploaded to our server, and nothing is stored or logged.

Can it unlock a PDF if I forgot the password?

No. Unlock PDF removes the password only when you enter the correct password. It does not recover, guess or crack forgotten passwords.

Will the unlocked PDF lose quality?

No. The tool decrypts the original file instead of converting its pages to images, so text, links, fonts and images stay exactly as they were, and the text stays selectable and searchable.

Is there a file size limit?

Yes, 100 MB per file. The work happens in your browser, so the limit keeps your device's memory use reasonable.

Does it work on mobile?

Yes. It works on phones and tablets as well as computers: tap the box to choose a PDF from your device.

Which browsers are supported?

Current versions of Chrome, Edge, Firefox and Safari. The tool needs JavaScript and WebAssembly, which these browsers support.

Questions about this tool? Contact us.