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No. It needs the current password and doesn't crack, guess, or brute-force anything. If the PDF opens without a password but blocks printing or copying, use Remove Restrictions instead.

Either. Enter whichever password you have; the tool authenticates with it and saves a copy with the encryption removed entirely, so no residual restrictions remain.

Yes, as long as they share the same password. Upload them all, enter the password once, and you get decrypted-pdfs.zip with the files under their original names. PDFs with different passwords need separate batches; any file that fails is counted in the summary while the rest still download.

The password didn't match the file. Check caps lock and trailing spaces, and make sure you're using this file's password rather than one from a similar document. A damaged file shows a Decryption Failed message instead; Repair PDF may help there.

No. Pages, text, images, forms, and bookmarks are kept; only the encryption layer is removed, and the file keeps its name. The output has no security at all, so re-protect it with Protect PDF if it needs a new password.

Common reasons: a document management system that rejects encrypted files, merging with other PDFs (many merge tools can't read encrypted input), long-term archiving, or a password that's no longer needed.

No. Decryption runs in your browser with WebAssembly PDF engines (CoherentPDF, with PyMuPDF as a fallback), so the file and the password stay on your device.

Yes. Decrypt PDF was renamed to Unlock PDF; it's the same tool with the same behavior.