验证您的 PDF 文件中的数字签名。检查证书有效性、查看签名者详情并确认文档完整性。所有处理都在您的浏览器中进行。
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Upload a trusted X.509 certificate to validate against a custom trust source.
Upload certificate (.pem, .crt, .cer)
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Select a digitally signed PDF file from your device
The tool extracts and parses all digital signatures in the document
See signer information, certificate validity, and signature status
This tool validates PKCS#7 digital signatures created with X.509 certificates, the standard format used by most PDF signing tools and certificate authorities.
A self-signed certificate is one where the issuer and subject are the same. While the signature is technically valid, it means the certificate wasn't issued by a trusted Certificate Authority (CA).
No, all processing happens entirely in your browser. Your PDF files never leave your device, ensuring complete privacy and security.