Two Kinds of PDF Password
PDFs can carry two different passwords. A user password (sometimes called the open password) is required just to view the document — without it the file won't open at all. An owner password (the permissions password) lets the file open freely but restricts actions like editing, copying or printing. This tool handles the everyday case: a document you can open — with the open password if it has one — that you want to save as a clean, unrestricted copy you can freely print and share.
Because the work happens entirely on your machine, the password you type is used only by the local decryption routine and is never transmitted anywhere.
How Local Decryption Works
When you supply the password, the pdf.js engine — the same renderer built into Firefox — decrypts the document inside your browser's sandbox. The pages are then rebuilt into a new PDF with no password and no restrictions, which is handed to you as a download. There is no upload step anywhere in the process: your confidential file never travels across the network, which is exactly what you want for contracts, statements and personal records.
Please use this only on documents you own or are authorized to modify. The tool is not a password cracker — it needs the correct password to decrypt a protected file, exactly as any legitimate reader would.
A Note on the Output
Because the unlocked copy is rebuilt by re-rendering each page, the text in the output becomes image-based and is no longer selectable. That trade-off is what lets the rebuild run entirely in the browser. Keep your original as the editable master, and use the unlocked copy for sharing and printing.