Drop in a PDF, a photo, a spreadsheet, anything. Sign it in seconds, and download a sealed copy with an audit certificate that proves exactly what was signed, by whom and when.
- Processed in your browser
- SHA-256 fingerprint
- Audit certificate
Three steps. No printer.
- 01
Drop in any file
- 02
Draw, type or upload your signature
- 03
Download it sealed
If you can open it,
you can sign it.
Visual files get your signature drawn right onto the page. Everything else is sealed with a signed certificate bound to the file's exact fingerprint, so the original stays untouched and provably yours.
- .pdfPDFSigned on the page
- .pngImagesSigned on the image
- .jpgPhotos & scansSigned on the image
- .docxWordSealed with a certificate
- .xlsxExcelSealed with a certificate
- .pptxSlidesSealed with a certificate
- .zipArchivesSealed with a certificate
- .*Anything elseSealed with a certificate
One plan.
Every document.
Less than a single courier trip. Sign as many files as you like, every month, and cancel whenever you want.
Proof that holds after you hit send.
A signature is only as good as the evidence behind it. HazardSign seals every document with a fingerprint anyone can recheck.
- Your files stay on your device
Documents are opened, signed and sealed inside your browser. They are never uploaded to our servers.
- Tamper-evident by design
Every certificate records the SHA-256 fingerprint of the exact bytes you signed. Any later change, even a comma, breaks the match.
- A clear audit trail
Signer name, email, date, time zone and device are written into the certificate page of every signed file.