How to use Check signatures
- Choose a signed PDF.
- Read the signature report.
- Use a trusted PDF reader for legal or identity validation.
Processed on your device
Check signatures
See what can be verified about a PDF's digital signatures on this device: whether the signed content is intact, whether the file changed after signing, and the certificate details. Identity trust is not verified.
Your files stay on your device. No account. No upload.
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Files you choose stay on this device.
Your file stays on your device
Check signatures runs entirely in this browser tab. The PDF is read from your device, processed here, and saved back to your device. It is not uploaded, and LittleOrMore never receives it. How privacy works
Questions
Are my files uploaded?
The file is read and processed by this browser tab. It is never uploaded to LittleOrMore or anyone else.
Does this prove who signed?
No. It checks the signature's structure and cryptography. Whether the signer's certificate is trusted needs a trust-chain and revocation check, which this tool doesn't perform.
What does “changed after signing” mean?
The file has content added after the signature (an incremental update). That can be legitimate, such as a second signature, but the later part isn't covered by the first signature.