🔒 Privacy-first • No account • File never stored

Prove your work existed
before you shared it.

Before you send a pitch deck, contract, or code snapshot — generate a cryptographic timestamp proving it existed at a precise moment. No account. No file storage. $9 one-time.

Protect this file — $9 How it works
👁 Preview the official certificate → (sample)
🗓️ Verifiable UTC timestamp 🧾 PDF certificate (instant download) 🔗 Shareable public verification link 🧠 SHA-256 cryptographic fingerprint
Used by founders, freelancers, lawyers, and developers who ship fast and need to prove it.

Create your proof

$9 one-time
🔒 Your file is hashed in memory and immediately discarded — we never see its contents.
One-time payment · Permanent proof · No subscription · No account
You get instantly:
  • Unique Proof ID you can reference forever
  • SHA-256 fingerprint of the exact file bytes
  • Public verification page — shareable, no login
  • Downloadable PDF certificate to archive

See the certificate before you pay

Every proof includes a printable PDF certificate with your unique Proof ID, SHA-256 fingerprint, UTC timestamp, and a public verification link.

Create a proof — $9 Preview certificate →
One-time payment · Instant PDF · No account required
This is a sample preview. Your certificate will include your file's fingerprint, timestamp, and Proof ID.

Why people use DocProof

📤
Before pitching investors
Prove your deck or roadmap existed before the meeting
💻
Before hiring developers
Prove what version of your idea or code existed
🤝
Before signing partnerships
Timestamp the exact agreement version both parties saw
✍️
Before publishing
Secure authorship of original designs, writing, or art
Step 1

Select your file

Choose any file up to 25 MB (PDF, image, doc, ZIP, code). We fingerprint the exact bytes in memory.

Step 2

Get your timestamp

After the one-time $9 payment, we create a cryptographic proof with a UTC timestamp. PDF certificate ready in seconds.

Step 3

Verify anytime

Share the link. Anyone can verify by re-uploading the original file — the SHA-256 hashes must match. No account needed.

🔐
Privacy by design: DocProof never stores your file. Only the cryptographic fingerprint and timestamp required for verification are kept. Even if our servers were breached, nobody could reconstruct your document from a SHA-256 hash.
Read our Privacy Policy →

Don't send it without proof.

$9, no account, 30 seconds. Your file stays private — only its cryptographic fingerprint is stored.

Create a proof now →

View pricing  •  API for developers  •  Verify an existing proof

Frequently asked questions

Is my file ever stored on your servers?

No. Your file is hashed in memory in your browser and immediately discarded. Only the SHA-256 fingerprint and UTC timestamp are stored — never the file itself.

What types of files can I timestamp?

Any file up to 25 MB — PDF, Word, Excel, images, ZIP archives, source code, video, or any other format. The proof works on the file's bytes, not its format.

Is this legally valid?

Cryptographic timestamps are recognized as evidence in many jurisdictions. While we don't provide legal advice, a verifiable SHA-256 proof is significantly stronger than file metadata alone. For high-stakes situations, consult a lawyer.

What if I modify the file after timestamping?

Even a single character change produces a completely different SHA-256 fingerprint. The proof only covers the exact version of the file that was timestamped — any modification creates a mismatch that anyone can detect.

Do I need an account?

No. DocProof requires no account, no login, and no subscription. You pay $9 once and receive your proof immediately. The Proof ID lets anyone verify it forever at docproof.app/verify-proof.

Who uses DocProof?

Freelancers, developers, lawyers, writers, researchers — see real scenarios where a timestamp makes all the difference.

See use cases →

Learn how it works

Guides on document timestamping, SHA-256 file integrity, and proof of existence — in plain language.

Read the blog →