Mac OS Nitro Pro is a Portable Document Format (PDF) editing application[2] and electronic signature software.

The company developed PDF software as an alternative to Adobe Acrobat.

[5] In June 2021, the company acquired PDFPen, a PDF editing app for Mac, iPad, and iPhone.

Subscription services feature cloud-based user management, deployment, and analytics tools.

Nitro Software's desktop products are compatible with Windows and Mac.