Verify Signature Online — Free & Instant

Verify and validate digital signatures in PDF files online for free. Check certificate authenticity instantly.

🔐Verify Signature — Free, No Signup

How to verify signature in 4 steps

Upload a PDF with a digital signature
Click "Verify Signature"
PDFKit checks the certificate chain and signature validity
View the verification result and certificate details

Why verify signature your PDF?

Verify that a signed PDF has not been altered and that the signer's certificate is genuine. Required for legal, government, and financial documents that use digital certificates.

Tips for best results

A valid signature means the document hasn't changed since it was signed
Certificate trust depends on the issuing CA — government-issued certificates show highest trust
An expired certificate does not automatically invalidate the signature if it was valid when signed

Related PDF tools

🔒Protect PDF 🔓Unlock PDF ✍️Sign PDF 💧Add Watermark

Frequently asked questions

Is Verify Signature free to use?+

Yes. Verify Signature is free for files up to 25MB with up to 3 tasks per day. Upgrade to Pro for unlimited use.

Do I need to create an account?+

No account is needed for free tasks. Sign up to unlock more daily tasks and larger file sizes.

Is my file secure?+

All files are encrypted during transfer and automatically deleted 1 hour after processing. PDFKit never accesses your document content.

Does this work on mobile?+

Yes. PDFKit is fully optimised for iOS and Android browsers. No app download required.

🔒 HTTPS encrypted🕐 Files deleted in 60 minutes🚫 Never read by humans✅ Free, no signup required