Polygon Collider

Turn a sprite’s alpha channel into a polygon collider in the browser: extract outer contours and optional holes, simplify with Ramer–Douglas–Peucker, and preview the mesh on the original image. Export Unity PolygonCollider2D C#, Sprite .png.meta physicsShape, and Godot 4 CollisionPolygon2D / .tscn. Batch PNGs or GIF frames, ZIP the sidecars, or send the overlay to the asset tray. Everything runs locally in a Worker — nothing is uploaded.