How to Timestamp a Document Online for Free

August 11, 2026 · 5 min read

You can timestamp any document online in seconds — no account required, no file upload, no storage. All you need is the document and a browser.

What does it mean to timestamp a document online?

Timestamping a document means creating a verifiable record proving the document existed at a specific moment in time. When you do this online with a cryptographic tool, the proof is mathematically unforgeable — it cannot be backdated or altered without detection.

Unlike a screenshot or an email, a cryptographic timestamp is independent of any platform, server, or third party. Even if the service you used disappears tomorrow, the proof remains valid.

How it works

When you timestamp a document online with DocProof, the process has three steps:

1. Your file is hashed locally. A SHA-256 fingerprint of your document is computed in your browser. The file never leaves your device.
2. The hash is recorded with a timestamp. DocProof stores the fingerprint and the UTC timestamp. Not the file — only its mathematical signature.
3. A proof ID is issued. You receive a unique proof ID. Anyone with the original file and this ID can verify the document existed at that moment.

Why not just email the document to myself?

Self-emailing is a common workaround, but it has serious weaknesses:

• Email timestamps can be spoofed or disputed
• Email providers can edit metadata
• A court or arbitrator may not accept it as independent proof

A cryptographic hash timestamp is different. The SHA-256 hash of a file is deterministic — it always produces the same output for the same input. If the file changes even by a single character, the hash changes completely. This makes it mathematically impossible to forge.

What types of documents can be timestamped?

Any file can be timestamped — the process works on the file's binary content, not its format. Common use cases include:

• Contracts and agreements before signing
• Creative work — designs, writing, music, code
• Business proposals and pitches
• Research notes and drafts
• Evidence and screenshots
• Any document where the date matters

How to timestamp a document online with DocProof

1. Go to docproof.app
2. Drop your file into the upload area
3. Your file is hashed locally — it never leaves your device
4. Pay once to record the proof ($9 for a permanent proof)
5. Receive your proof ID and share it with anyone who needs to verify

How to verify a timestamp later

Verification is always free. Anyone with the original file and the proof ID can go to docproof.app/verify-proof, enter the proof ID, upload the original file, and instantly confirm whether the file matches the recorded hash and timestamp.

If even one byte has changed, verification will fail — making any tampering immediately visible.