Free · runs in your browser · nothing uploaded
Nerulio is a free game asset studio: slice sprite sheets, build animations, pack atlases and generate autotile tilesets — exported for Godot, Unity, Phaser and more. No install, nothing uploaded.
or drop a sprite sheet, frames, a GIF, an .aseprite file or a tileset anywhere on this page
Workflow
Each workspace does one part of the pipeline and hands its result to the next. Everything runs in this browser tab.
Sprite
Drop a sheet, numbered frames, a GIF or an .aseprite file. The grid is detected with a confidence you can overrule; tags, timing, pivots, hit and hurt boxes are edited on a real timeline.
Open the Sprite workspace
Pack & Export
MaxRects packing with trim, rotation, padding, extrusion and multipack. One click writes the files each engine expects; the engine list below says which exports were loaded back in the real engine.
Open Pack & Export
Tile
The layout of a 47-tile blob or Wang sheet is recognised from the pixels, terrain bits are filled in, and a test map is painted with the same rule Godot 4 uses.
Open the Tile workspace
Pixel
Pencil, bucket, selections and layers on Aseprite keys, indexed palettes and Lospec, onion skin. Upscaled or resized pixel art is measured and turned back into one pixel per pixel.
Open the Pixel workspace
Single-purpose tools next to the Studio: frame palette locking and ramps, texture channel packing and PBR checks, 9-slice panels and bitmap fonts. UI runs as a Lab until its Studio workspace is built.
Every export is loaded back into the engine and compared field by field and pixel by pixel. GameMaker and LDtk: format checks only.
Every game tool also has its own page. Search, or open the full list.
Sprites · atlases · tilesets · Godot · Unity · Phaser
PNG / GIF / APNG / .aseprite / TexturePacker·Aseprite JSON / Starling XML → PNG atlas + Godot 4 · Unity 6 · Phaser · PixiJS · Defold · LÖVE · Spine · Tiled · LDtk · GameMaker · .aseprite — Input decoding and output encoding depend on browser support.
One studio covers the whole 2D asset pipeline: slicing, animation tags and timing, pivots and hitboxes, trimmed and rotated atlas packing, and autotile tilesets with terrain rules. Exports load in Godot 4, Unity 6, Phaser, PixiJS, Defold, LÖVE, Spine, Tiled and Aseprite, and each was checked by loading it back into that engine.
Pixel, texture and UI work still uses the Lab tools while their Studio workspaces are built. GameMaker and LDtk exports are format-checked, not run in the engine. Browser evidence so far is Chromium.
No. .aseprite files are read and written in the browser (checked against the real Aseprite on 231 files), and the packer, exporters and tileset tools run on your device with nothing uploaded.
Everything on these pages is free and works without an account. There is no watermark and no export that is held back.
No. The Studio decodes, packs and exports in this browser tab. Projects are autosaved in the browser (IndexedDB) and can be saved as a .nerulio file.
