Snapseed is one of the most feature-rich photo editors for mobile out there and it’s completely free, unspoiled by any kind of in-app purchases or other bloat.
Now, it's also gotten an impressive new feature: the ability to edit RAW format photos (in version 2.1) that many top-end smartphone are capable of shooting these days. Officially, RAW image capture was introduced with the Camera 2.0 API and Android 5, but it depends on the phone maker whether to introduce the feature or not. Even if you can shoot RAW images, question remains: how do you edit those files on a phone?
Google engineer Anton Daupert explained:
"A photo in RAW format preserves all of the original data that was captured by the camera. This allows you to perform edits – such as recovering blown-out highlights – that are impossible with the more commonly used JPEG format."
You can find a couple of examples right below and a link to the app further below.