Have a sprite sheet whose frames don’t fit one grid? PNG Slice Workbench lets you choose each rectangle, refine its pixel bounds, name and order the frames, then download separate PNGs plus a uniform-cell atlas and coordinate JSON.
It uses the included sheets only; custom imports and exports are disabled. You can also inspect a free source-and-output example in the Download demo section.
For a quick test, select irregular-demo.png, draw a rectangle and click Add crop as frame, then refine numeric bounds and Apply edits.
The full local HTML download is $2.99 and accepts your PNGs. Atlas cells follow the largest crop with top-left alignment; no tight packing, engine importer or project save. Export before closing. Built with AI-assisted scripting and reviewed examples.
Actual full-tool interface using the original sample sheet:
