Chọn tệp PDF
Kéo và thả tệp vào đây, hoặc nhấp để chọn
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Chọn tệp PDF
Kéo và thả tệp vào đây, hoặc nhấp để chọn
Digital Signature allows you to add cryptographic X.509 digital signatures to PDF documents. Unlike simple drawn signatures, digital signatures provide legal validity and document integrity verification.
Upload your certificate file (PFX, P12, or PEM format), enter the password, and sign your PDF. You can add visible signatures with custom text, images, and positioning, or invisible signatures for document integrity only.
All signing happens locally in your browser. Your certificate and documents are never uploaded to any server.
Upload the PDF document you want to digitally sign.
Upload your X.509 certificate file (.pfx, .p12, or .pem) and enter the password.
Optionally add reason, location, and visible signature with custom text or image.
Click Sign PDF to apply the digital signature and download the signed document.
Sign contracts, agreements, and legal documents with legally binding digital signatures.
Digitally sign invoices, purchase orders, and approval documents for audit trails.
Ensure documents have not been tampered with after signing.
PFX (.pfx), PKCS#12 (.p12), and PEM (.pem) certificate formats are supported.
Yes, X.509 digital signatures are legally recognized in most jurisdictions when using a valid certificate.
Yes, you can add a visible signature with custom text, image, position, and styling.