Digital signatures using certificates provide legal validity and cryptographic proof of document authenticity. Unlike electronic signatures, digital certificates verify the signer's identity and ensure document integrity.
Digital vs Electronic Signatures
Understanding the difference helps choose the right signing method.
- Cryptographic verification
- Signer identity confirmation
- Document integrity protection
- Legal acceptance globally
- Tamper detection
Signing Options Compared
Choose the best method based on your legal requirements and workflow.
| Method | Legal Status | Identity |
|---|---|---|
| Self-signed Cert | Limited | Self-declared |
| CA Certificate | Full | |
| e-Signature | ||
| Digital ID Service |
"Digital certificates turn signatures into cryptographic proof, providing legally admissible evidence of document authenticity."
How to Sign with Certificate
Follow these steps to add a digital signature:
- Obtain or create a digital certificate
- Import certificate to your system
- Open PDF in signing tool
- Select digital signature placement
- Choose certificate for signing
- Apply and save signed PDF
1. Get digital certificate
2. Import to system
3. Open PDF file
4. Place signature
5. Select certificate
6. Sign and saveSign PDF with Certificate
Add legally-binding digital signatures to your documents. Secure and verified.
Digital Sign PDFFrequently Asked Questions
Do digital signatures require a certificate authority?
Self-signed certificates work for basic use, but CA-issued certificates provide legal recognition in most jurisdictions.
Are digital signatures legally binding?
Yes, digital signatures are legally binding in most countries, including the US (ESIGN Act) and EU (eIDAS).
Can I verify a digital signature?
Yes, PDF readers can verify signatures by checking the certificate and showing signature validity status.
How long do certificates last?
Certificates typically expire in 1-3 years. You'll need to renew and re-sign documents with new certificates.