Can this crack a PDF I do not have the password for?

No, and it does not try. You supply the password you already have and it is removed from the copy you download. A PDF whose password is genuinely unknown cannot be opened by this or any honest tool.

Why remove a password at all?

Usually because the protection has served its purpose — an archived statement or payslip you now want to search, print, or store without a prompt every time.

Remove a PDF Password

Strip the password from a PDF when you already know it, so you stop retyping it. Runs in your browser; the file and the password stay on your machine.

Runs entirely in your browser — your file is never uploaded.

Questions

Can this crack a PDF I do not have the password for?: No, and it does not try. You supply the password you already have and it is removed from the copy you download. A PDF whose password is genuinely unknown cannot be opened by this or any honest tool.
Why remove a password at all?: Usually because the protection has served its purpose — an archived statement or payslip you now want to search, print, or store without a prompt every time.

Password-Protect a PDFPDFs
Fill In a PDF FormPDF forms
Merge PDF FilesPDFs

Or open the full PDF tool.

Questions

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