Nitro Pro


Nitro PDF Pro is a Portable Document Format editing application and electronic signature software.
WWW Official Site

History

Nitro Software was founded in Melbourne, Australia in 2005 to develop an alternative PDF software to Adobe Acrobat.
In 2015, the company had sold 1 million licenses.
In June 2021, the company acquired PDFPen, a PDF editing app for Mac, iPad, and iPhone.

Controversy

In May 2025, the company sent a letter to all owners of perpetual licenses older than version 13, informing them that their previously lifetime license will be deactivated unless they upgraded to a subscription model.
As of June 2025, Nitro Software was graded F by the Better Business Bureau for the company's failure to respond to customer complaints. As a result, Nitro Software is no longer rated by Better Business Bureau.