Register File
Drop your file here or click to browse
Your file never leaves your browser. Only its fingerprint is sent.
Selected:
Select a file to register its fingerprint.
Email confirmation required
Success!
Filename
Hashtag
SHA-256 Hash
How it works
1. Register
Select a file. Your file never leaves your browser — a unique fingerprint (SHA-256 hash) is computed on your device and recorded with a timestamp.
2. Proof record
You receive a certificate with a hashtag, the SHA-256 hash, and the registration timestamp. This is your proof that the file was registered in its current state.
3. Share & Verify
Share the verification link or hashtag. Anyone can select the same file on hashtagfile.com to confirm it is authentic and unchanged.
Verify File
Drop your file here or click to browse
Your file never leaves your browser. Only its fingerprint is sent.
Selected:
Select a file to verify its fingerprint.
Enter the issuer domain exactly as shown on the document, or as you assume it should be.
Filename
Hashtag
Proof ID
Checked Hash (SHA-256)
Registered
Registered Filename
Domain
Registered Domain
Mismatch Warning
Mismatch detected for Registered Filename / Registered Domain. We recommend verifying directly with the issuer.
No Registration Credits
You have no registration credits remaining. Purchase a credit package to continue registering files.
Credits are used for registrations. Verification is always free.
Company Credits
Restore Your Actions
Do you have an earlier purchase? Enter your Secret Code to restore access.
Actions restored successfully!
Invalid code
The code you received after your purchase