Add a PDF file to sign and add a X509 certificate, whose extensions can be .pfx or .p12. The image is optional, but recommended if you want to display a signature block. Click on sign and you will get a digitally signed PDF.
From languages such as PHP, Java, Ruby, Python or .NET, you can digitally sign your PDF with a X509 certificate using POST or JSON calls. API
As a web application, you can sign PDFs on all operating systems using the latest web browsers. It works on Windows, Mac and Linux.
When we sign a PDF with a X509 certificate, we make this PDF legally valid, unique and non-modifiable. Getting our PDFs certified has never been so easy with this tool.