PhotoDemon provides a comprehensive selection of photo editing tools in an 8 MB download. It runs on any Windows machine (XP through Win 10) and does not require installation. It can easily be run from a USB stick or SD card. PhotoDemon is completely open-source and available under a permissive BSD license. Outside contributions from coders, designers, translators, and enthusiasts are always welcome. It is lightweight and completely portable, integrates macro recording and batch processing, provides a comprehensive selection of pro-grade features and tools:

Extensive file format support, including all major RAW formats Powerful selection tools, with support for antialiasing, feathering, and on-canvas sizing/moving Color-managed workflow, including full support for embedded ICC profiles Non-destructive editing for select features, including resizing and common adjustments 2D transformations: advanced rescale operators (Sinc, Catmull-Rom, etc), content-aware scaling (seam carving), crop, rotate, shear, zoom, tiling Pro adjustment tools: levels, curves, HDR, white balance, split-toning, sepia, full-featured histogram, green screen, Wratten filters, and many more Filters and effects: perspective correction, edge detection, noise removal, content-aware blur, unsharp masking, lens diffraction, vignetting, film grain, and many more 150+ tools are provided in the current build.