Customize the signature to your liking. You can append a visible or invisible signature. Visible signatures can be further customized.

Hi Producthunt, thanks for hunting @__tosh As developers, @cproof and me were frustrated with the lack of options for easily signing PDFs via CLI. Most solutions were either proprietary, had no CLI interface or had restrictive licenses, making it difficult for us to use them in our projects. That's why we created open-pdf-sign - a simple, easy-to-use tool for signing PDF from the commandline. We designed it with developers in mind and released it under the Apache-2.0-license. We also added a configurator that automatically configures your Nginx server so all your PDFs will be signed with your SSL certificate on the fly. You can even use your existing Let’s Encrypt certificates. Hope you find this useful and give us a star on Github :)

Love open source tools. Congratulations on the launch.