Chọn tệp PDF
Kéo và thả tệp vào đây, hoặc nhấp để chọn
Xác minh chữ ký số
Chọn tệp PDF
Kéo và thả tệp vào đây, hoặc nhấp để chọn
Validate Signature allows you to verify digital signatures in PDF documents. Check if signatures are valid, view certificate information, and confirm document integrity.
Upload a signed PDF to see all signatures, their validity status, signer information, and whether the document has been modified after signing.
All validation happens locally in your browser. Your documents are never uploaded to any server.
Upload a PDF document that contains digital signatures.
See all signatures found in the document with their validity status.
View certificate information, signer details, and signing timestamp.
Optionally download a JSON report of the validation results.
Verify that signed documents are authentic and have not been tampered with.
Check signature validity for compliance and audit purposes.
View certificate details and expiration dates for signed documents.
A valid signature means the document has not been modified since signing and the certificate chain is intact.
Yes, you can upload multiple PDFs and validate all signatures in batch.
Signatures may be invalid if the document was modified, the certificate expired, or the certificate is not trusted.