Secure
Digital signature
Cryptographically sign a PDF with your P12/PFX certificate (PAdES) — the certificate never leaves your browser. Optional visible signature.
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Related tools
Protect PDF
Add a password (AES-256), remove a known password, or repair a damaged PDF — with optional fast web view.
Unlock PDF
Remove the password from a PDF you can already open — you must know the current one. It doesn't crack protected files.
Redact PDF
Black out sensitive content with permanent rectangles you draw on the page.
Redact by search
Type words or patterns and redact every match across the entire PDF.