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Collision Polygon Generator

Trace collision polygons from the alpha silhouette and see the vertex count and the error.

Drop image files hereProcess many files at once
No upload · processed on this device

Collision Polygon Generator

Trace collision polygons from the alpha silhouette and see the vertex count and the error.

How it works

  1. Add images
  2. Adjust settings and review the result
  3. Download a new file

Supported formats

PNG / JPG / WebP / AVIF / HEIC → PNG + JSON (ZIP) — Input decoding depends on browser support and optional engines.

What this tool does

Trace collision polygons from the alpha silhouette and see the vertex count and the error.

Implementation and verified quality

advanced · Studio Sprite workspace: measured grid (margin, spacing) or alpha islands, colour key, previewed import decisions; GIF/APNG/.aseprite decoders; timeline, pivots, boxes, alpha contour collision. Quality qualification is in progress. Pro/Flagship quality has not been established.

Before you export

No convex decomposition: use the convex hull when an engine needs convex shapes.

Frequently asked questions

What are this tool’s limitations?

No convex decomposition: use the convex hull when an engine needs convex shapes.

Are my files uploaded?

Nerulio processes selected files on your device and has no file-upload API. Optional engines and models are downloaded from third parties; those requests expose connection information such as your IP address.

Will my work be saved automatically?

No. Images and editing state stay in this tab; media output can use local temporary storage. Changing language preserves your work; reloading, closing the tab, or following a link to another page can clear it.