Sada Files
  1. 1
  2. 2
  3. 3

Upload PDF

Add PDF from your device to get started

Drop your PDF here

Drag & drop, paste, or click to select PDF for Verify PDF Signature.

Or drag and drop a file here

PDF

Verify PDF Signature online, free

Validate digital signatures — certificate chain, signer, timestamp and whether the document changed after signing.

  • Runs in your browser — no upload
  • Free, no sign-up, no watermark
  • PDF

How to use Verify PDF Signature

  1. 1

    Add your PDF file

    Drop a file on the page, paste it, or click Select Files. Nothing is uploaded — it opens straight in your browser.

  2. 2

    Fine-tune the settings

    The defaults already suit most files; change them only if you need to.

  3. 3

    Run Verify PDF Signature

    Press the start button. Processing happens on your device, usually in seconds.

  4. 4

    Download the result

    Save the finished file, or continue with another tool without downloading in between.

What Verify PDF Signature can do

  • Private by design — files are processed in your browser and never uploaded
  • Free with no sign-up, no watermark and no daily limit

Verify PDF Signature — frequently asked questions

Is Verify PDF Signature really free?

Yes. Verify PDF Signature is free forever on Sada Files — no ads, no premium tier, no watermark, no daily cap that pushes you to pay. Every option on this page is available to everyone.

Do I need to sign up or create an account?

No. There is no account system at Sada Files. Open the page, drop your file, pick your options and save the result. History and saved workflows stay on your device.

Is my file uploaded anywhere?

No. Verify PDF Signature runs on your device — in your browser using WebAssembly, or inside the free native app. Your file never leaves your computer or phone, which is why there is no upload wait.

Which formats does Verify PDF Signature accept?

Verify PDF Signature accepts PDF. Files are identified by their content, not their extension, so a mislabelled file still works.

Is there a file size or file count limit?

Only what your device can handle. Because processing happens locally there is no server cap, no queue and no "upgrade for larger files" message.

Can I chain Verify PDF Signature with other tools?

Yes. After every result a Continue with… menu lists every tool that accepts this output, and the file is handed over in memory. Save the chain as a workflow and re-run it on hundreds of files, or call it in one API request.

Does Verify PDF Signature work on my phone?

Yes. The web app works on Android and iOS browsers, and the free Sada Files app for Android, iOS, Windows, Linux and macOS runs Verify PDF Signature fully offline.

Related tools

All PDF Tools