PDF Security and Privacy Tools
Security tools protect a PDF with a password, remove a password you are entitled to remove, black out text, strip scripts, attachments and metadata, check or remove digital signatures, and show what a file contains.
Use the tools that remove protection only on files you own or are allowed to open. Each tool page states what it can and cannot do.
- Password Protect PDFAdd Password encrypts a PDF with a password you choose, using qpdf and a 256-bit key, so opening the file requires that password. We cannot reset a forgotten password.
- Unlock PDFRemove Password decrypts a password-protected PDF when you enter the password that opens it, and returns an unprotected copy. It does not guess, crack or recover forgotten passwords.
- Add WatermarkAdd Watermark repeats your text in a diagonal grid across every page of a PDF. You choose the text, size, angle and color; the text is drawn in Helvetica, so it supports Latin letters, digits and punctuation.
- Sanitize PDFSanitize PDF removes selected active and hidden content from a PDF: document-open and additional JavaScript actions, embedded files, XMP and Info metadata and link annotations, with optional font removal. It is share hygiene, not an antivirus scan or redaction.
- Redact PDFAuto Redact replaces every page whose text contains one of your search terms with a solid black page. Matching ignores case, and the old content of a redacted page is removed. It works on text layers, not scans.
- Remove PDF SignatureRemove Certificate Signature deletes the digital signature fields from a PDF, together with the certification lock that blocks edits, so the file no longer reports as signed. Ordinary form fields are kept.
- Validate PDF SignatureValidate Signature reads the digital signatures in a PDF and reports what OpenSSL finds as a JSON list. It does not change the file, and without a trust anchor it cannot confirm that the signer's chain is trusted.
- Add PDF StampAdd Stamp places one line of text, such as APPROVED, a company name or a date, at the same spot on every page, like a rubber stamp. The text is drawn in Helvetica, so Latin characters only.