PDF Fingerprint (Sign)

Generate a SHA-256 cryptographic fingerprint of a PDF and a signed manifest you can share, so any later change to the file is detectable. Computed in your browser — nothing is uploaded.

How to use PDF Fingerprint (Sign): Open PDF Fingerprint (Sign) — no sign-up or software download is required. Drag and drop your file(s) into the tool, or click to browse and select them from your device. Choose any options you need, such as order, quality, page range or output format. Everything runs inside your browser, so your data never leaves your device.

Select a PDF to fingerprint

Processed locally in your browser — never uploaded.

Generate a SHA-256 cryptographic fingerprint of a PDF and a signed manifest you can share, so any later change to the file is detectable. Computed in your browser — nothing is uploaded. PDF Fingerprint (Sign) is a free, browser-based tool in the Filevane pdf tools collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.

How to use PDF Fingerprint (Sign)

Open PDF Fingerprint (Sign) — no sign-up or software download is required.
Drag and drop your file(s) into the tool, or click to browse and select them from your device.
Choose any options you need, such as order, quality, page range or output format.
Click the action button and let the tool process everything locally in your browser.
Download the finished file. Your originals are never changed or uploaded.

Why use PDF Fingerprint (Sign)?

100% free with no limits, no sign-up and no watermarks.
Private by design — your files are processed in your browser and never uploaded to a server.
Fast and lightweight, with instant results even on a phone or a slow connection.
Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
Part of a full pdf tools suite, so related pdf digital signature tasks are one click away.

What people use PDF Fingerprint (Sign) for

Creating a tamper-evident fingerprint of a document before sending it.
Recording a checksum so a recipient can verify nothing changed in transit.
Establishing that two copies of a document are byte-identical.

PDF Fingerprint (Sign): limits and things worth knowing

This computes a SHA-256 hash of the file. Any change to the document at all, however small, produces a completely different fingerprint — which is what makes it tamper-evident.
A hash proves integrity, not identity. It shows the file has not changed; it does not prove who produced it. That requires a certificate-based digital signature from a trusted authority.
The fingerprint must reach the recipient through a different channel from the file. Sending both together lets anyone who alters the document simply recompute the hash.
Verification is done with Verify PDF Signature.

Is it private and secure?

Your privacy is built in. PDF Fingerprint (Sign) does all processing on your own device using client-side code, so your files are never transmitted, stored or seen by anyone — including us.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

We also measured the competition. Our PDF upload audit recorded how many bytes each of 20 online PDF tools actually transmits: 12 of the 13 measurable services uploaded the whole test file, and Filevane transmitted 0.00 MB.

Learn more

How to Sign a PDF Electronically for Free — Add your signature to a PDF by drawing, typing or uploading it — no printer, no scanner. A quick guide to e-signing safely.

See all free pdf tools or browse the full tool catalogue.