Pixel Art Image Converter

Convert images into pixel art with palettes, dithering and retro effects.

Try an example: A small red pixel sprite · Moss ordered dither

How it works

Resize a photo or drawing, adjust its colors, and apply an automatic or imported palette with ordered or error-diffusion dithering. Download a transparent PNG, editable pixel sprite and reusable recipe.

Auto-orient and convert the source to sRGB, then sample native output pixels using nearest-neighbor fit, centered fill or stretch. Images are limited to 4 MB and 2 MP.
Apply RGB offsets, brightness and contrast, gamma, then saturation. Palette matching uses squared sRGB distance with first-entry tie-breaking. Automatic palettes select frequent adjusted colors.
Ordered dithering uses a 4 × 4 Bayer bias. Serpentine Floyd–Steinberg distributes errors with 7/16, 3/16, 5/16 and 1/16 weights; transparent pixels neither receive nor spread errors. Strength zero equals no dithering.
Alpha below the threshold becomes transparent. PNG integer scaling repeats pixels exactly. Dithering runs on native pixels and does not change with preview zoom or export scale.

Sources

PixaTool: palette conversion, effects and batch workflow inspiration (Kronbits)
ImageMagick: color quantization and dithering (ImageMagick)

For scripts and AI agents

JSON API: POST https://fliplinepixelquantizer.usefulweb.site/api/v1/calculate (same calculation as this page)
Interface description: OpenAPI 3.1 · AI guide: llms.txt
MCP server (Streamable HTTP): https://fliplinepixelquantizer.usefulweb.site/mcp · tool name flipline_pixel_quantizer

Example request

curl -s -X POST https://fliplinepixelquantizer.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"image":{"filename":"red.png","contentType":"image/png","contentBase64":"iVBORw0KGgoAAAANSUhEUgAAACAAAAAgAQMAAABJtOi3AAAABlBMVEX/////AADrWueTAAAAEklEQVQI12NgIBb8/09dgjgAAPcnH+GApkH4AAAAAElFTkSuQmCC"},"width":8,"height":8,"colors":4,"scale":4}'