Xóa hạn chế

Use Unlock PDF when a PDF asks for a password before it will open. Use this tool when the PDF opens but blocks printing, copying, editing, or commenting; it strips those restrictions and writes a copy with no encryption at all.

If the PDF opens without asking for a password, leave the field empty and the restrictions are removed as is. If a password is required, enter it in the Owner Password field. The tool doesn't crack, guess, or brute-force passwords.

Password protection, printing limits, editing locks, text and image copying restrictions, annotation and commenting limits, and the usage restrictions attached to some digitally signed PDFs. The output has zero encryption, so anyone who receives it can open it freely.

That depends on your rights to the document and on local law. Removing restrictions from files you own or are licensed to use, for example to run accessibility tools or copy quotes for notes, is the intended use. Don't use it to get around someone else's copyright or licensing terms.

No. QPDF rewrites only the encryption layer; pages, text, images, bookmarks, and form fields are untouched, and the output keeps the original file name.

That error appears when QPDF can't open the file with the password you entered, or with no password. Check for typos and caps lock, and if the file needs a password to open, enter that one.

Not with this tool, which removes all security. To keep a password and adjust individual permissions such as printing or copying, use Change Permissions instead.

No. QPDF runs as WebAssembly inside your browser tab, so the file and any password you enter stay on your device.