🔒 Privacy-first • No account • No file storage

Prove a document existed
without storing it.

DocProof generates a cryptographic fingerprint (SHA-256 for now) to prove a document existed at a given time. Your file is never stored.

Create a proof How it works
Works with PDFs, images, contracts, invoices, source code, and more.

Create a proof

SHA-256
The file is hashed in memory and immediately discarded.
Creating a timestamped proof is a paid feature.
You will receive
  • Proof ID + fingerprint
  • Public verify link
  • Downloadable PDF certificate
Step 1

Upload

Select any file. We compute a cryptographic fingerprint from the exact bytes.

Step 2

Certificate

Download a PDF certificate containing the proof ID, fingerprint, and timestamp.

Step 3

Verify

Anyone can re-upload the original file to independently verify integrity.

Privacy guarantee: DocProof never stores your file. Verification relies solely on matching the cryptographic fingerprint.