PDF Signature Verify
FreeVerify digital signatures and certificate validity in PDF files
About PDF Signature Verify
Received a PDF that claims to be digitally signed and want to know if you can trust it? A digital signature is only meaningful if it actually checks out. This tool inspects the signatures embedded in a PDF and reports whether they're valid and whether the certificate behind them holds up.
Upload the signed document and the tool reads its signature data, checking the certificate and whether the content was changed after signing. The analysis runs in your browser, so the file stays on your device. It's free, needs no account, and produces a verification result rather than a new file. It's a quick way to confirm a document's authenticity before you rely on it.
Common uses
- Confirm a signed contract hasn't been altered after signing
- Check the certificate details on a digitally signed PDF
- Verify the authenticity of an official document you received
- Spot a signature that's broken or invalid
- Review who signed a document and when
How to use
- 1
Upload your file
Click the upload area or drag & drop your file. Supports APPLICATION/PDF. Up to 50 MB.
- 2
Click "Process — PDF Signature Verify"
Click the process button. Your file is converted instantly on our secure servers.
- 3
Download your result
Preview and download your converted file. No watermarks, no quality loss, no expiry.
Why ToolHub?
- 100% Free — no account needed
- Works in your browser — no software required
- Instant results
- Secure and private
- No data stored
- Simple to use
FAQ
What does a valid result actually tell me?
It indicates the signature matches the document content and the certificate checks out, meaning the file wasn't tampered with after signing.
Does this tool sign documents?
No. It only verifies existing digital signatures and certificates. It doesn't add a signature to your PDF.
Why might a signature show as invalid?
Common reasons include the document being changed after signing, an expired or untrusted certificate, or damaged signature data.
Can I use PDF Signature Verify on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.