Don't use Adobe and such photo editors. Trackers and metadata should be in your hands, not in the hands of corporations.
Online image editor lets you create, edit images using HTML5 technologies. No need to buy, download, install or have obsolete Flash. No ads. Key features: layers, filters, HTML5, open-source, Photoshop alternative.
miniPaint operates directly in the browser. You can create images, paste from the clipboard (ctrl+v) or upload from the computer (using menu or drag & drop). Nothing will be sent to any server. Everything stays in your browser.
Open-SourceBrowser
GIMP is a cross-platform image editor available for GNU/Linux, macOS, Windows and more operating systems. It is free software, you can change its source code and distribute your changes.
Whether you are a graphic designer, photographer, illustrator, or scientist, GIMP provides you with sophisticated tools to get your job done. You can further enhance your productivity with GIMP thanks to many customization options and 3rd party plugins.
Open-Source Windows Linux macOS Highly Recommended
Krita is a free and open-source digital painting application. It is for artists who want to create professional work from start to end. Krita is used by comic book artists, illustrators, concept artists, matte, and texture painters and in the digital VFX industry.
Open-Source Windows macOS Linux
Professional Photo Management with the Power of Open-Source
Open-Source Windows macOS Linux
Inkscape is a free and open-source vector graphics editor used to create vector images.
Open-Source Linux macOS Windows