Sprite Sheet Studio — Slice & Pack Sprite Sheets in Your Browser

Slice a sprite sheet into individual frames, or pack loose images into a single sheet plus a coordinate (atlas) JSON. A game-dev tool that runs right in your browser, on both Windows and Mac — no install needed.

Single HTML, no install, no account, fully offline. Just double-click the file. English / 日本語 toggle included.

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SLICE — sheet image -> individual frames
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- By count (cols x rows) — an even grid by column and row count
- By cell size (px) — cell width/height, outer margin, spacing
- Auto-detect (split by transparency) — finds clusters of pixels separated
by transparency (best with transparent-background PNGs)
- Trim transparent edges per frame / overlay the slice grid on the preview
- "Export frames (ZIP)" downloads every frame as PNGs in one ZIP
- Optionally include coordinate data (JSON) with each frame's position/size

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PACK — loose images -> one sheet
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- Drop many sprites at once (keep adding more anytime)
- Padding between sprites / max sheet width
- Trim transparent edges to pack tightly
- Force power-of-two size (for engines)
- Pack largest first to reduce wasted space
- "Export sheet" saves the packed PNG and coordinate data (JSON)

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COORDINATE DATA (JSON)
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- A common atlas format with each frame's name, position (x,y) and size
(w,h). It follows the TexturePacker-style JSON (Hash) layout, so
frameworks that read it (e.g. Phaser) can load the result.

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NOTES
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- Code-drawn, no image/audio assets — tiny and fast
- Tested on current Chrome / Edge. No internet needed
- Works on Windows AND Mac — nothing to install
- Everything is processed in your browser — nothing is ever uploaded
- Your settings are remembered next time
- Commercial use OK (see included terms)

FOR: 2D / pixel-art game devs who want to slice or pack sprite sheets fast, without installing a Windows-only desktop app.

Found a bug or want a feature? Message me.