Unlock PDF
Honest answer: this isn't available yet, on purpose. Here's why, and what to use instead.
This tool would only ever be for removing a password from a PDF you own and already know the password to — never for bypassing protection on a file that isn't yours.
Why we don't offer this
Removing a password means correctly decrypting every encrypted string and stream in the file using the PDF standard security handler (RC4 or AES per the spec), then rewriting the file without encryption. The library this site uses for reading/writing PDFs client-side (pdf-lib) doesn't implement PDF decryption — it can only ignore the encryption dictionary, not actually decrypt encrypted content. That means the output would be corrupted rather than actually unlocked.
Rather than ship a tool that silently produces a broken file, we're leaving this out until we can support it with a properly reviewed decryption implementation.
What to use instead right now
- Adobe Acrobat: open the file with the password, then use "Remove Security" under Protect → File Security.
- macOS Preview: open the file with the password, then File → Export as PDF produces an unencrypted copy.
- qpdf (free, open-source, runs on your own machine):
qpdf --password=yourpassword --decrypt in.pdf out.pdf.