Black out the sensitive part. Prove the rest is untouched.
Redacting a document normally destroys its credibility: once you've edited it, the reader has no way to know what else you changed. Here you remove what must stay private and hand over a proof that every other paragraph is byte-identical to the original — checked on their device, with nothing uploaded from yours.
Drop a Word document (.docx)
Runs entirely in this tab. The document is never uploaded.
Pick the paragraphs
Your document is read in this tab and shown as a list. Tick what to hide. Nothing is uploaded — there is no server to trust.
Redacted, not covered
The chosen text is removed from the file itself, not hidden behind a black rectangle you could copy out. Everything else keeps its original bytes.
The rest is proven
You get a proof alongside the document. The recipient checks it and sees that every part you didn't redact is byte-identical to your original — and that nothing was added.
What the proof does and doesn't say
It proves integrity: every document part and every paragraph you kept hashes to the commitment made before the redaction, so nothing was quietly altered, added or removed along the way, and the redacted text is genuinely absent from the file rather than merely hidden. It does not prove where the document came from — for that, the source has to be anchored (a signed email, a signed PDF), which is what the document verification flow adds. And it can't tell you whether the right things were redacted; that judgement stays yours.