Fingerprint locally
SHA-256 identifies the exact file bytes without uploading the file.
Simple evidence for important files
Email yourself a file fingerprint.
Create a SHA-256 receipt in your browser, add a description, and send it to your own inbox. Your original file never leaves this device.
- No account
- No upload
- No blockchain
- 1Select file
- 2Describe it
- 3Email receipt
Step 1
Choose a photo or document
Only your browser reads the file. Nothing is uploaded to ProofStamp.
Step 2
Describe the evidence
SHA-256 fingerprint
Step 3
Your receipt is ready
Open your email app, review the message, and send it to yourself.
ProofStamp Email Receipt
1 inbox
Keep the original file.
You do not need to email it. You will need the same file later to verify the fingerprint.
Local verification
Check a file against a receipt
Select the preserved file and provide the SHA-256 from the email or JSON receipt.
Or paste the fingerprint below.
This file also stays on your device.
What this gives you
A practical email record, not a claim of truth.
Store it in your inbox
Your email provider records when it received the hash receipt.
Verify it later
A matching hash shows the preserved file has exactly the same bytes.
Important limitation
This receipt does not prove when or where a photo was taken, who created the file, whether it was edited before the receipt was made, or whether its contents are true. The email received time is a practical record, not an independent public timestamp.