Digital Signature
Apply a certificate-based digital signature (PKCS#7) using your own .p12/.pfx certificate, privately in your browser.
Runs in your browser Premium
Digital Signature is a premium tool
Sign in with a plan that includes premium tools. You'll come straight back here afterwards.
How to use Digital Signature
- 1
Choose or drop your file
- 2
Adjust the options
- 3
Process and download the result
Good to know
- Signs with your PKCS#12 (.p12/.pfx) RSA certificate entirely in your browser. Your private key is never uploaded.
- Any later modification of the signed PDF invalidates the signature.
Frequently asked questions
Is Digital Signature private?
Yes. This tool runs entirely in your web browser. Your files are processed on your device and are never uploaded to our servers.
Is there a file size limit?
Without an account you can process files up to 50 MB. Paid plans raise the limits.
Do I need to install anything?
No. It works in any modern browser on Windows, macOS, Linux, Android and iOS.