Hey everyone! I made PackPix, a small offline tool that turns a batch of PNG frames into a packed sprite sheet — right in your browser.

• Drop in PNG frames (or load demo frames) — processed locally, nothing is uploaded
• 3 free layouts / 6 full layouts including MaxRects dense packing
• Padding 0–16 px, live atlas preview with numbered cells, fill ratio stats
• Trim transparent margins & 90° rotation, power-of-two sizing (full edition)
• One-click PNG export; JSON atlas + batch ZIP export (full edition)
• Deterministic packing — the same frames always produce the same sheet
• One HTML file — double-click, no install, nothing ever leaves your computer, works offline forever
• English & Japanese UI

Free edition (3 layouts, PNG export): https://capsuloom.itch.io/packpix
Full edition ($5 — MaxRects, JSON atlas, batch ZIP): https://capsuloom.itch.io/packpix-full

It's made by me, so feedback is very welcome — happy to hear which layouts or export formats you'd want next.