SealZero

What it does

SealZero lets you prove image and document authenticity using zero-knowledge proofs — fully client-side. You can selectively mask sensitive parts of a document, share the modified version, and provide a cryptographic proof that guarantees authenticity and integrity. No data ever leaves the browser. Proof size is under 11kB. Open-source and built for real-world use.

Your photo is authentic. Prove it — without showing the original. SealZero gives editorial offices a cryptographic certificate in seconds. Free, no registration, no uploads.

Editorial offices need to trust your redacted images and PDFs. SealZero gives them a cryptographic verification certificate — instantly. Free. No registration. No uploads. Runs entirely in your browser. Not another watermark. Not a metadata tag. A cryptographic proof. Anyone who edits images or PDFs and needs to prove the edit is honest. No. All processing happens entirely in your browser. No images or PDFs ever leave your device. No. The original never leaves the reporter's device. The editorial office receives only the edited image and a verification certificate link. Yes. Watermarks can be cropped out and metadata can be stripped. SealZero creates a cryptographic proof tied to the actual…from sealzero.dev

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  TLDR, Let's Seal gives the finger to Adobe and every doc signing tool (docusign, google, etc) who pay to play with the Adobe Approved Trust List and then charge you for something that should be free. Currently even the person checking if a document/contract is sealed or code is authentic has to also be inside the same Adobe walled garden too. Verification, the part that should be free is the part everyone charges for. Thats the shape Let's Encrypt fixed for TLS, and I wanted the same thing for documents and files. The core idea therefore needed to go a bit beyond e signatures and i…

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