What is proof of existence for a file?
Proof of existence shows that a specific file already existed at a certain time, without revealing its contents to anyone.
PRIVATE DOCUMENT TIMESTAMPCreate private proof of existence for any file.
Create private proof of existence for any file.
Without uploading the file itself.
Create a document timestamp in your browser, save the proof to your dashboard, keep a dated certificate, and come back to it later. This is useful for contracts, drafts, copyright evidence, client deliverables, and any file where timing matters.
Every proof is anchored to a global, independent timestamp network maintained by thousands of computers worldwide — no single company or server can alter or erase the record. A free account keeps your recent proofs easy to find again in one place.
How it works
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Pick any file
PDF, photo, contract, video, ZIP — any file works, from contracts to source code.
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Nothing leaves your device
We create a private digital fingerprint right here in your browser. Your file is never uploaded or stored.
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Get your dated proof
Save the proof in your dashboard and keep a dated certificate ready to share or verify later.
Ready? Drop your file on the rightarrow_forward
dashboardFREE ACCOUNT DASHBOARD
lockSTAYS ON YOUR DEVICE
picture_as_pdfPDF CERTIFICATE INCLUDED
inventory_2KEEP EVERY PROOF ORGANISED
Why it matters
What a document timestamp actually gives you.
You do not need blockchain expertise. What matters is that your file stays private, the proof is dated, and anyone can check the same fingerprint later.
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PRIVATE FROM THE START
Your file stays on this device. We only use a digital fingerprint created in your browser, so the original file never needs to be uploaded.
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DATED PROOF YOU CAN KEEP
You get a certificate that records when the proof was created, giving you something clear to save with the original file.
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CAN BE CHECKED LATER
The proof is tied to a permanent public record, so it can be verified later without relying on screenshots, email trails, or memory.
USEFUL WHEN TIMING MATTERS
Helpful for contracts, drafts, photos, creative work, and any file you may need to prove later.
Create a dated certificate in a few clicks and keep it with the original file. When someone asks when it existed, you have something verifiable to show.
EASY TO SHARE
Your PDF certificate includes the key details and a verification link you can send to a client, colleague, or yourself.
WORKS FOR ANY FILE
PDFs, images, videos, ZIPs, spreadsheets, design exports. If you can choose the file, you can create proof for it.
POPULAR GUIDES
VIEW ALL GUIDESLearn the workflows behind proof of existence.
Start with the key questions people search for before they need evidence: what a timestamp proves, how to create one privately, and how to verify a file later.
How to timestamp a document without uploading it
The simplest way: let your browser create a fingerprint of the file, save only the fingerprint to the record, and keep the original with the certificate.
How to prove you created a file first
A timestamp won’t replace every legal process, but it creates strong evidence that your file existed before a later dispute.
FREE TO START
shield_with_heartCREATE A PROOF FREE