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Protect & Sign
Verify the digital signatures in a PDF.
Find out whether a signed PDF is still exactly as it was signed. Pyrbit PDF reads each digital signature and shows the signer, the signing time, the document’s integrity and the certificate chain.
Runs in your browser·Files are never uploaded·One free document every 24 hours with a Google account
How it works
Verify PDF Signature in three steps.
Choose the signed PDF
Select a contract, certificate or statement with a digital signature.
Read the result
You see whether the signature is valid, not valid or of unknown validity, plus whether the document was changed after it was last signed.
Check the details
Each signature shows who signed, their organisation, when, whether the document is unchanged and the certificate chain status.
What you can do
What Verify PDF Signature does.
- Signer name and organisation
- Signing time (and whether it was only claimed by the signer)
- “Document unchanged” integrity check
- Certificate chain status, with a warning if the file changed after signing
Private by design
Your PDF never leaves your device.
Verify PDF Signature runs inside your browser tab. The file you choose is read from your device, processed there, and the result is saved back to your device — it is never uploaded to a Pyrbit server, so there is no copy to keep or delete.
Processed in your browser
The Pyrbit PDF engine runs on your computer or phone, not in the cloud.
No upload
Your document isn’t sent anywhere — not to us, and not to a third-party converter.
Sign-in is for your plan only
Your Google account keeps track of your free daily document and Pyrbit Pro. It never gives us your files.
Prefer offline?
The Pyrbit PDF apps do the same work on your phone, tablet or Mac — even without a connection.
Web or app
Use Verify Signature in your browser, or in the free app.
Web browser
Works on any computer, tablet or phone with a modern browser. Sign in with a Google account to use the web app: one free document every 24 hours, with any tool. Pyrbit Pro (₹79/month or ₹599/year) gives unlimited use with no ads.
iPhone, iPad & Mac
Every tool, including Verify Signature, with no file-size limit and offline use. Free on iPhone and iPad (with ads); the Mac app is paid.
Android & Chromebook
Every tool, including Verify Signature, with no file-size limit and offline use. Free, supported by ads.
FAQ
Verify PDF Signature questions.
What does “Validity unknown” mean?
The document is intact and the signature is mathematically correct, but the signer’s certificate issuer isn’t in a trust list here — common for e-Aadhaar in readers that don’t include the CCA India roots.
Is a drawn signature a digital signature?
No. A drawn or typed signature is a picture. A digital signature is cryptographic data embedded in the file; if a PDF has none, the tool tells you.
Can I check the signature on an e-Aadhaar?
Yes — use Aadhaar Digital Signature. It includes the CCA India root certificates, so e-Aadhaar and Indian DSC signatures can show as valid. Verification is read-only and never changes the file.
Is Verify PDF Signature free?
On the web, sign in with a Google account and you can use Verify PDF Signature — or any other tool — on one free document every 24 hours. Pyrbit Pro (₹79/month or ₹599/year) gives unlimited use with no ads. The Pyrbit PDF apps for iPhone, iPad and Android are free, supported by ads.
Ready when you are.
Open Verify Signature in your browser — your file stays on your device.