Do you have a photograph that you'd like to sharpen? Adjust the brightness? Add a filter? Polarr is a photo-editing tool that can be used on a wide number of devices: visitors can download Polarr for iOS or Android devices; for Mac, Linux, or Windows computers, or as a Google Chrome Extension. Users can also use Polarr on their web browser. Polarr's basic account is available for free; with a paid Pro account, users have access to additional filter options and editing tools.