Lock a PDF so it can't be changed on the way to someone. If a single number, word, or bank account is altered in transit, the seal breaks — and anyone can spot it in seconds.
📎 Seal a document
1. Pick the type, attach your PDF. 2. Click Seal — a sealed copy downloads. 3. Send that copy. If it's changed on the way, the seal breaks.
Several PDFs at once (up to 20)? Pick them together — you get one ZIP of sealed copies and a short report.
✅ Check a document you received
Drop in a PDF and we'll tell you instantly: genuine & unchanged, or tampered with. No account, no login.
Up to 20 at once — one line per file.
💡 Agents can seal what they send automatically — turn on "Auto-stamp the output" on any agent, and its documents and emails are sealed with no manual step.