MutaSprite [Toolkit] — Free Green-Screen Sprite Cleaner

Green screen in. Clean sprite out. Free.

MutaSprite ChromaKey Cleaner is a small, fast, 100% local Windows tool: drop a green-keyed sprite or sprite sheet in, get a clean transparent PNG out — hard pixel-art edges, no scaling, no cloud, no account. Every keying profile is included; quality is never gated.

What the free tool does

• Every keying profile, free — Green, Green (hard, content-safe), Auto, Custom Color, Magenta Sprite, Magenta FX, FX Glow (soft-matte). The right key for sprites, outlines, water/glow FX and mixed-colour subjects.
• Pixel-exact, never scaled — hard edges (alpha 0/255), no resampling. 64×64 in, 64×64 out.
• Despill & edge cleanup — pulls the green cast out of the fringe and repairs contaminated outline pixels — none of the muddy halo from “shrink + nearest-neighbour”.
• Residue Repair — already cut out, but a green haze or speckles still cling to the edge (typical after upscaling)? Strip them band-limited — soft Detox or a crisp, guaranteed green-free edge — content untouched.

How to use it

Download below and run MutaSprite — portable, no installer. Drop in your sprite, pick a profile, export. That’s it. Runs entirely on your machine.

FAQ

Is it really free? Yes — the ChromaKey core is free and full-quality. No trial, no watermark, no account.
Does it scale my art? No — keying is pixel-exact and never resamples. Resizing is a separate operation.
Windows only? Yes for now — a portable Windows build.

Part of the MutaSprite toolkit

ChromaKey gets backgrounds off. When you need to transform sprites, optional one-time modules slot into the same app — Pixelize (painterly or AI art → real pixel art with console-authentic palettes), Undetail, Slice + SliceX and Batch & Automation. See the whole toolkit at mutatool.com.

Built in the open by a solo dev — questions or sprite-pipeline talk welcome at mutatool.com/help.