Proof of Existence
for Any File
Create a timestamped certificate that proves your file existed at a specific moment. Useful for original work, contracts, and audit trails.
Drop a file here
or click to browse
How It Works
- 1
Select or paste your content
Drop a file or paste text. Your data stays in your browser.
- 2
We compute a SHA-256 hash locally
The hash is a unique fingerprint of your exact file contents.
- 3
Pay once and download your certificate
Your signed certificate includes the hash, timestamp, and a verification signature.
$4.99
per certificate
100%
client-side hashing
No account
required
Frequently Asked Questions
What is file hash timestamping?▼
File hash timestamping creates a cryptographic fingerprint (SHA-256 hash) of your file and records when that fingerprint was created. This proves your file existed in its exact form at that specific moment.
What is proof of existence?▼
Proof of existence is evidence that a specific piece of data existed at a certain point in time. FileStamp provides this by generating a signed certificate linking your file's unique hash to an immutable timestamp.
Does my file get uploaded?▼
No. Your file never leaves your device. FileStamp computes the SHA-256 hash entirely in your browser. Only the hash (a 64-character string) is sent to our server to generate your certificate.
What can I use this for?▼
Common uses include proving when you created original work (art, writing, code), documenting the state of contracts or agreements, creating audit trails for compliance, and establishing prior art for inventions.
How do I verify my certificate later?▼
Re-hash your original file using any SHA-256 tool. If the hash matches the one on your certificate, it proves the file is unchanged since the timestamp was created.