Google's Nik Collection of photo-editing tools are now free to use for Mac and Windows. That's because Google is turning its attention to its mobile tools.

On Nik's Google+ page, Google explained: "As we continue to focus our long-term investments in building incredible photo editing tools for mobile, including Google Photos and Snapseed, we've decided to make the Nik Collection desktop suite available for free, so that now anyone can use it."

If you purchased the Nik Collection this year, Google will automatically issue a full refund in the coming days. The move comes a month after Google decided to shelve Picasa, another desktop image-editing tool. Google acquired the popular collection of filters and editing tools for Adobe Photoshop and Lightroom in 2012. A year later, it dropped the price from $499 to $149. The mobile version of Snapseed (Android, iOS), which Google also acquired with the Nik Collection, offers a solid collection of image-editing tools for Android and iOS devices.

Clifford Colby follows the Mac and Android markets for Download.com. He's been an editor at Peachpit Press and a handful of now-dead computer magazines, including MacWeek, MacUser, and Corporate Computing.