Pixel sprite format for GitHub Actions

Give your GitHub Actions logs a mascot. The pixel sprite format describes small pixel-art characters as plain JSON: a grid of characters, a legend that maps each character to an xterm-256 colour, and optional colour variants. The editor exports ANSI text built for the GitHub Actions log viewer, where ordinary terminal pixel art smears into stripes.

Draw a sprite in the browser, export it, and cat it from any workflow step. No install, no account, no build step.

Documentation

• Tutorial
  Draw your first sprite

  Paint a sprite in the editor and print it in a GitHub Actions log, start to finish.

• How-to guides
  Get a specific job done

  Print in a workflow, add colour variants, store a symmetric sprite as half, validate a file.

• Reference
  Sprite format v1

  Every field, the grid and lighting rules, rendering targets and conformance.

• Explanation
  Why it works this way

  Why half-blocks smear in GitHub logs, and why the format uses characters, xterm-256 and fixed lighting.