Create a private fingerprint
Your browser gives the file a unique SHA-256 code without uploading it.
A timestamped record for important files
Give an important file a date you can point to.
Choose one file. ProofStamp creates a unique fingerprint and prepares a ProofStamp email you can send to yourself. Your file stays on your device.
- No account
- Nothing uploaded
- Works in your browser
- 1Select file
- 2Add context
- 3Email ProofStamp
Step 1
Choose one file
Your file is read only inside this browser. It is never uploaded to ProofStamp.
Step 2
Add a short description
Unique file fingerprint (SHA-256)
Step 3
Your ProofStamp is ready
Open your email app, check the ProofStamp, and send it to yourself.
ProofStamp
1 inbox
Keep the original file.
You do not need to email it. Keep this exact file so you can check it against the ProofStamp later.
Check a saved file
Does this file match the ProofStamp?
Choose one file and paste the fingerprint or ProofStamp email. ProofStamp checks everything in your browser.
Look for the 64-character file fingerprint in your ProofStamp email.
How it helps
A simple record you can check later.
Email the ProofStamp
Your inbox stores the fingerprint, your description, and the email received time.
Check the file later
A matching fingerprint shows that the saved file has exactly the same contents.
What a ProofStamp does not prove
It does not prove when or where the file was originally created, who made it, whether it was edited before the ProofStamp, or whether its contents are true. The email received time records when the ProofStamp reached your inbox.