Guides

Redaction is one of the few tasks where the interface tells you nothing when you get it wrong: a covered name and a removed name look identical on screen. These pages cover how it actually works, how to check your own files, and where the sharp edges are.

• Why PDF redaction fails

  A black rectangle over text does not remove the text. What actually happens inside the file, the ten-second test that exposes it, and the cases where governments and law firms got it wrong.

• How to redact a PDF properly

  Step by step, in the browser and in Acrobat — including the verification step most instructions leave out, and the six mistakes that produce a file that only looks redacted.

• Redacting without uploading

  Most online tools transmit your unredacted document to a server first. What that commits you to, how to test whether a tool really works locally, and what the trade-offs cost you.

• UK GDPR and subject access requests

  Removing third-party personal data before disclosure, why identification by context defeats automatic tools, and how a drawn box can turn a formatting slip into a reportable breach.

The tool these came out of redacts PDFs entirely in your browser, with nothing uploaded. Try it — the first export is free.