PNG Coords CLI is a cross-platform command-line tool for reading and editing coordinate maps embedded in PNG files via the private ancillary chunk pcRd.

Each map stores normalized points (x, y in [0, 1]) with text descriptions—useful for annotated images, hotspots, and metadata that travels with the PNG itself.

Commands: list, put, update, remove, and clear. Writing commands overwrite the input file by default, or write a copy with --out.

Built with Java 17 and picocli on top of the pl.koder95:png-coords library. Releases include native app-image packages for Windows, Linux, and macOS (no separate JDK required on the target machine), plus optional shaded JAR builds. Release integrity is verified with SHA-256 checksums and GPG signatures.

Homepage / source: https://github.com/koder95/png-coords-cli

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2026-08-09
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