Only unlock files you're allowed to open
This tool needs the password. It cannot guess, crack or bypass one, and it can't open a file whose password you don't have. It's meant for documents that are yours, or that you've been given the password to, such as your own statements, payslips or ID.
Removing a password doesn't change who owns a document. Don't remove restrictions from files you aren't permitted to copy or share.
Why it's safer than upload sites
Most online unlockers send your PDF, and often its password, to a server. A bank statement or ID card is exactly the kind of file you don't want sitting on someone else's machine.
Here, the file is read and processed inside this browser tab. The page's security policy blocks network requests to other sites, so the file and password have nowhere to go. After the first visit it also works offline.
What encryption is used
When you add a password, the PDF is encrypted with AES-256 (PDF 2.0, security revision 6). It works in current versions of Adobe Acrobat, Chrome, Edge, Firefox, Preview on macOS and most mobile viewers. Very old readers from before 2006 may not open it.
The strength of the lock depends mostly on your password: a long, unique one is far harder to guess than a short one.
Questions
Can this tool recover a forgotten password?
No. It only works when you already know the password. It does not guess or crack passwords, and a strongly encrypted PDF can't be opened without it.
Is my PDF or password uploaded anywhere?
No. Everything happens in your browser, and the page is not allowed to make network requests to other sites. The password is held only in memory while the tab is open.
Will the unlocked copy look the same?
Pages, text and images are kept as they are. Interactive extras such as form fields and bookmarks aren't carried over to the unlocked copy.
What does "owner password" mean?
Some PDFs open freely but restrict printing, copying or editing. Those limits are set by an owner password. If you have the right to, this tool can save a copy without them.