Can this open a PDF when I have forgotten the password?

No, and neither can anything else. The document body is encrypted with AES, and the password is the key that decrypts it. Without the key there is nothing to read — the bytes are noise. Any service claiming to recover a forgotten open password is either guessing common words or taking your money.

Then why does it work on my file without a password?

Because your file almost certainly carries an owner password rather than an open one. It was never sealed; it simply asks readers not to print or copy. Removing that request needs no key, which is exactly why the document opened for you in the first place.

Is it legal to remove the restrictions?

That depends on the document and where you are, and it is a question about your rights over the file rather than about the software. Removing a restriction from your own bank statement or a form you were sent to complete is uncontroversial. Circumventing protection on material you have no right to use is not, whatever tool is involved.

Does the document change in any other way?

No. The pages, text layer, images and fonts come through untouched — only the encryption dictionary is dropped. Digital signatures are the exception: a signed document that is rewritten no longer matches what was signed.

Unlock PDF

Remove a PDF's password and encryption, with the password that opens it.

Everything runs inside your browser. Your files never leave your device.

Drop your files here

.pdf · they stay on this device

Ask about Unlock PDF

Questions about what this tool does, which option to pick, or what it can and cannot handle.

This is the one part of the site that uses a server. The question you type here is sent to an AI provider to be answered — your files and whatever you put in the tool above are not, and the assistant cannot see them. Answers are generated and can be wrong; the tool itself is not guessing.

About the Unlock PDF

A locked PDF is locked in one of two ways, and knowing which one you are holding decides everything about what happens next.

The first is a user password, sometimes called an open password. The document's contents are genuinely scrambled with a cipher, and the password is the key. Nothing can read a single word of it — not a reader, not this page, not the person who wrote it — until the correct key is supplied. If you have the password, this removes it and writes a plain copy. If you do not, nobody can help you, and any website promising otherwise is either wrong or selling something.

The second is an owner password, and it is a much stranger thing. The document opens for anyone who clicks it. Inside is a note saying which activities the author would prefer you did not perform: printing, copying text, filling the form, extracting a page. Well-mannered readers obey that note. It is a request rather than a barrier, which is why a document you can already read on screen can still refuse to print. Lifting it needs no password, because there was never anything sealed.

Almost everyone who arrives looking to unlock a PDF has the second kind: a form from an office that will not let itself be filled in, a report that refuses to print, a scan that will not give up its text to a copy-paste. That is a formatting obstacle wearing a padlock icon, and it comes off here in a second.

The work is done by qpdf, the same tool the Unix world has used for two decades, compiled to WebAssembly and running inside this tab. Your document is not sent anywhere. Given the kind of file that tends to be protected in the first place — tax papers, salary slips, legal drafts, medical results — uploading one to an unknown server in order to make it more accessible would be an odd bargain.

The decrypted copy is byte-for-byte the same document underneath: the same pages, the same fonts, the same selectable text. Only the encryption layer is gone.

How to use it

1Drop in the PDF that is refusing to cooperate.
2If it asks for a password when you open it normally, type that password in the box. If it opens fine but blocks printing or copying, leave the box empty.
3Run the tool. The result tells you which of the two kinds of lock it found.
4Download the plain copy.

Questions

Can this open a PDF when I have forgotten the password?: No, and neither can anything else. The document body is encrypted with AES, and the password is the key that decrypts it. Without the key there is nothing to read — the bytes are noise. Any service claiming to recover a forgotten open password is either guessing common words or taking your money.
Then why does it work on my file without a password?: Because your file almost certainly carries an owner password rather than an open one. It was never sealed; it simply asks readers not to print or copy. Removing that request needs no key, which is exactly why the document opened for you in the first place.
Is it legal to remove the restrictions?: That depends on the document and where you are, and it is a question about your rights over the file rather than about the software. Removing a restriction from your own bank statement or a form you were sent to complete is uncontroversial. Circumventing protection on material you have no right to use is not, whatever tool is involved.
Does the document change in any other way?: No. The pages, text layer, images and fonts come through untouched — only the encryption dictionary is dropped. Digital signatures are the exception: a signed document that is rewritten no longer matches what was signed.