Guides

What redaction actually is, what the usual tools do instead, and what a badly redacted file still carries.

• Why a black box on a PDF hides nothing

  The rectangle is drawn on top; the words stay underneath, where a copy-paste finds them. How to check a file you have already sent.

• How to redact a PDF without uploading it

  Most online redaction tools send your document to a server. What that means, and how a browser can do the work instead.

• The risks of a badly redacted document

  What stays reachable in a file when a rectangle removes nothing, what that can lead to, and the checks worth running before sharing a PDF.

• Frequently asked questions

  Short answers: file size limits, scanned documents, metadata, what the tool refuses to do.

These guides also exist in French.