Will it work on a phone?

Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.

Because the expensive part — the server farm — does not exist. Processing runs on your device, so the site can stay free without a signup wall in front of it or an upsell in the middle of a job.

Which file types does Verify Digital PDF Signature accept?

The drop area takes PDF. Files are read from your device in the browser, so the format has to be one a browser can decode — that is why the accepted list on this page is finite and honest rather than "everything".

Verify Digital PDF Signature

Beta

Inspect signature fields present in a PDF.

Lists signature fields and signer metadata; full cryptographic validation against certificate chains/trust lists requires system trust stores not available in the browser.

Drag & drop the signed PDF

or click to browse — .pdf · up to 1 files

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About Verify Digital PDF Signature

Verify Digital PDF Signature is here for controlling who can open, change or read a document: inspect signature fields present in a PDF. The answer is shown on the page — there is no converted file to download. What it does today: lists signature fields and signer metadata; full cryptographic validation against certificate chains/trust lists requires system trust stores not available in the browser.

Useful when the job is controlling who can open, change or read a document and you would rather not install software, join a queue or hand the file to a stranger.

How to use Verify Digital PDF Signature in 3 steps

Start by dropping the PDF you want to work on; the limit is 100 MB per file.
There is nothing to configure for Verify Digital PDF Signature — nothing else; the signature state is read from the document.
Press Inspect signatures and read the answer on the screen; nothing leaves your device to be computed.

What you get with Verify Digital PDF Signature

Answers on the page, with no file to open afterwards
Nothing to configure — drop the file and press the button
Honest scope: lists signature fields and signer metadata; full cryptographic validation against certificate chains/trust lists requires system trust stores not available in the browser.
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

Verify Digital PDF Signature: questions

What can't Verify Digital PDF Signature do?: Lists signature fields and signer metadata; full cryptographic validation against certificate chains/trust lists requires system trust stores not available in the browser. That limit is stated on the page and in the alert above the tool, not buried in a footnote.
Will it work on a phone?: Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.
Why is it free?: Because the expensive part — the server farm — does not exist. Processing runs on your device, so the site can stay free without a signup wall in front of it or an upsell in the middle of a job.
Which file types does Verify Digital PDF Signature accept?: The drop area takes PDF. Files are read from your device in the browser, so the format has to be one a browser can decode — that is why the accepted list on this page is finite and honest rather than "everything".