GBS Asset Preflight checks simple-sprite and background PNGs for size, palette, frame and tile problems before import. It works offline in your browser; your files stay on your computer.
Free to download. If it helps, an optional $1 donation is appreciated.
Choose your asset type, add your PNGs and click Analyze locally. You can also export a CSV report.
Version 0.1.0 has a CSV issue: after changing files or settings, rerun analysis, keep inputs unchanged until it finishes, then click Export CSV again. A PASS doesn't guarantee your whole scene will build.
Did it catch a useful problem, or does your current workflow work better? Let me know in a comment—no private files needed.
Unofficial tool with AI-assisted code and text; not affiliated with GB Studio.
