Sign with Certificate
Digitally sign PDF using X.509 certificates.
Drag & drop files here, or click to select
Certificate Details
How to Apply a Certificate Signature
Upload the document you want to sign with a digital certificate.
Choose your certificate file (such as a PFX or P12 file) from your device.
Enter the password associated with your digital certificate.
Apply the cryptographic signature and save the certified document.
Secure Certificate Signing Options
Cryptographic Authentication
Embed a cryptographic signature that verifies your identity and guarantees the document has not been altered.
Industry Formats
Supports standard digital certificate formats including PFX and P12 key stores.
Integrity Checks
Discovers any changes made to the document post-signature, alerting readers if tampering occurs.
Device Level Safety
Password entry and signature computation occur fully in your browser, protecting private keys.
Frequently Asked Questions about Certificate Signing
It is a signature that uses a digital certificate to verify the identity of the signer and ensure document integrity.
Yes, the decryption and signing processes occur locally on your machine. Your credentials never travel over the internet.
No, the certificate adds security signatures without changing text contents or formatting structures.