Timestamp any file.
Verify it later.
Create a portable proof package with an RFC 3161 cryptographic timestamp. Your file never leaves your browser — only the SHA-256 hash is used.
Seal a file now · $2Drop your file
SHA-256 hash computed locally. Nothing uploaded.
Instant timestamp
RFC 3161 timestamp response from FreeTSA.org included as evidence.
Download .proof
Portable package you can verify anytime, anywhere.
File never leaves your browser
RFC 3161 timestamp standard
Open verification format
No account needed
Already have a .proof package?
Verify any InkSeal package directly in your browser — free, no upload.
Open Verifier