Validate Signatures
Verify authenticity of digitally signed PDFs.
Drag & drop files here, or click to select
How to Verify PDF Signatures
Select the signed document you wish to verify.
Allow the validator to inspect the internal signature records.
Read the validation report detailing certificate validity and modification status.
Export the signature validation details if needed for documentation.
Precise Signature Validation Tools
Certificate Chain Check
Verify the certificate authority chain and check if the signing key has expired or been revoked.
Tamper Detection
Analyze if any changes have been made to the document bytes since the signature was applied.
Detailed Signer Reports
Extract signer name, contact details, signing location, and precise digital timestamp information.
Private Analysis
Validation is computed inside your browser, so document contents and certificates are never uploaded.
Frequently Asked Questions about Signature Validation
It means the document was signed by the certificate owner and has not been altered since the signing occurred.
A signature may be invalid if the document contents were modified, or if the digital certificate has expired.
The validator parses standard cryptographic headers locally, utilizing built-in certificate data libraries.