PalTool

PalTool is a free and open source utility for converting palettes and optimizing image file sizes. It handles the kind of work that comes up when you need to reduce color depth, convert between animation formats, or prepare graphics for environments with strict size or palette constraints. Whether you are working with pixel art, game sprites, or web animations, PalTool gives you granular control over how colors get quantized and how files get compressed.

The tool converts between several animation formats including APNG, animated WebP, and GIF. On the input side it accepts a wide range of formats like PNG, WebP, GIF, JPG, BMP, PSD, TGA, and HDR files. This flexibility means you can bring in assets from most common sources and output them in whatever format your target platform needs. If you have ever struggled to get an animated graphic under a file size limit while keeping it looking decent, this is the kind of tool that helps.

Color quantization is where PalTool gets interesting. It offers multiple dithering algorithms and lets you configure color depth precisely. You can set per block color limits, generate palettes from scratch, or apply existing palettes to new images. For anyone working with indexed color modes or trying to match a specific aesthetic like retro game graphics, these controls matter more than they might sound.

PalTool runs in two forms. There is a web based version that works in any modern browser with JavaScript enabled. For heavier workloads or automation, there are native command line binaries for Linux and Windows. The command line version can be scripted into build pipelines or batch processing workflows, which is useful if you are processing hundreds of sprites or regularly exporting animation sets.

The project is licensed under GPLv3 and the full source code is available on GitLab. You can inspect exactly what it does, fork it, or contribute improvements. For developers who care about understanding their tools or need to modify behavior for specific use cases, having the source available is a real advantage over closed alternatives.

It targets a specific audience, developers and artists who work with paletted graphics and need precise control over color reduction. If you are building for the modern web with no constraints, you probably do not need it. But if you are making pixel art games, optimizing animations for bandwidth limited environments, or working with hardware that expects indexed color, PalTool fills a gap that general purpose image editors often handle poorly.

Because it is completely free with no premium tier or usage limits, you can use it as much as you need without worrying about costs. The trade off is that support comes through GitLab issues rather than a dedicated team, which is typical for open source projects of this scope.