Pixlr claims to be "the most popular online photo editor in the world", which may have something to do with the fact that it's free graphic design software.
But it also boasts more than 600 effects, overlays, and borders and lets you do all the main things you'd expect from a photo editor, from cropping and re-sizing to removing red-eye and whitening teeth.
And if you're used to using Photoshop, then you'll find Pixlr's user interface easy to pick up quickly, as it's very similar. This free app is available in both iOS and Android varieties.For photo editing, free graphic design software Paint.net is an excellent alternative to Photoshop
Paint.net is a Windows-based alternative to the Paint editor that Microsoft shipped with versions of Windows. Don’t let that put you off, though, as it's surprisingly capable, useful and free graphic design software.
The focus is on ease of use, and there's a definite tendancy towards photo editing rather than artistic creation. That said, there are a range of special effects available, allowing you to easily create fake perspective, blend and push pixels around the canvas, tile and repeat selections, and so on.
A good range of selection tools, support for layers, and adjustments such as curves and brightness/contrast mean that Paint.net is a great alternative to Photoshop for photo editing, especially if you can do without some of the more recent additions to Photoshop’s toolset.Free graphic design software Sumopaint works in the browser, and requires Adobe Flash to use
- Platform: Web browser (requires Adobe Flash Player)
Sumopaint is a highly capable browser-based image editor. All the standard features you’d expect from a desktop tool are present and correct (and by buying the Pro version for you can install a desktop version of the app if you prefer).
The standard range of tools and adjustments you’d expect are all included. Brushes, pencils, shapes, text, cloning, gradients, etc are all quickly accessed from the Photoshop-esque floating toolbar. It can also open saved documents from your hard drive, making Sumopaint a perfectly viable option for editing and reediting.GIMP is a popular, free graphic design software alternative to Photoshop
- Platform: Linux, Windows, Mac
Open-source free graphic design software that debuted on Unix-based platforms, GIMP stands for GNU Image Manipulation Program. Today it’s available in versions for Linux, Windows, and Mac.
GIMP's interface differs somewhat from Photoshop, but a version of GIMP is available that mimics Adobe's look and feel, making it easier to migrate over if you're ditching Photoshop. The full suite of tools is available here – everything you're accustomed to is within easy reach, including painting tools, colour correction, cloning, selection, and enhancement.
The team that oversees development has worked hard to ensure compatibility too, so you'll be able to work with all the popular file formats without any trouble at all. You'll also find a very capable file manager built in, along similar lines to Adobe’s Bridge.