Spritesheet vs Aseprite
Aseprite is a beloved pixel art editor with spritesheet export - but it costs $20, needs a desktop install, and the spritesheet workflow is a secondary feature. Spritesheet Generator is purpose-built for sprite packing.
A dedicated spritesheet tool vs a pixel art editor
Aseprite excels as a pixel art drawing tool, and its spritesheet export is a nice bonus. But if your main goal is packing, splitting, and managing spritesheets, a dedicated tool saves time. Spritesheet Generator lets you import sprites from any source - including Aseprite exports - and gives you full control over layout, spacing, and multi-format export.
What Aseprite actually is
Aseprite is a pixel art editor first. It is where you draw the frames: a timeline with layers and cels, onion skinning, tilemap mode, a palette system with colour ramps and shading modes, and a brush engine built specifically for placing individual pixels. Nothing here competes with that, and this page is not going to pretend otherwise.
Its Export Sprite Sheet dialog is genuinely capable. You get layout types (horizontal strip, vertical strip, by rows, by columns, and a packed layout), padding and spacing controls, trim, merge duplicate frames, and a JSON data file in either hash or array form. There is also a command line interface, which is the piece most people miss, and it is the right answer if you want sheet export wired into a build script.
The catch is that the dialog works on one Aseprite document. It exports the frames of the file you have open. That is the correct design for an editor, and it is also the shape of the problem it does not solve.
Where a dedicated packer earns its place
The jobs that fall outside a single .aseprite document are the ones this tool is built for. Frames that came from three different artists in three different files. A folder of PNGs somebody exported two years ago with no source project. An animated GIF a client sent that needs to become a sheet. An existing sprite sheet, shipped and in the repo, that needs one frame changed and no .aseprite file exists anywhere.
That last case is the common one, and it is why the splitter matters. Drop a finished sheet in, get the frames back out, edit, repack. Aseprite can import a sheet as frames too, but the round trip through a document you did not author is friction you do not need for a five-minute fix.
The other gap is engine-specific output. Aseprite writes its own JSON, which Phaser and PixiJS read happily because it is close enough to the TexturePacker shape. Godot SpriteFrames resources, Tiled .tsj tilesets, and Sparrow XML for FNF mods are not in that dialog, and hand-converting JSON into a .tres is nobody idea of a good afternoon.
The honest workflow: use both
The setup that works is draw in Aseprite, pack here. Export your frames from Aseprite as individual PNGs (File, Export, or the CLI with a frame name pattern), drop the folder in, set columns and padding, preview the timing, and export whichever format your engine wants.
If you are already exporting sheets straight out of Aseprite and your engine reads its JSON, keep doing that. Adding a second tool to a pipeline that already works is a cost, not a feature.
Pick Aseprite when
You are drawing the art yourself, you want one tool from first pixel to final sheet, and your engine reads Aseprite JSON or slices a plain grid. The $19.99 buys a genuinely excellent editor and supports its developer.
Pick Spritesheet Generator when
Your frames already exist and came from somewhere else, you need to pull apart a sheet you did not author, or your engine wants a SpriteFrames .tres, a Tiled tileset, or Sparrow XML that the Aseprite dialog does not write.
| Feature | UsUs | Aseprite |
|---|---|---|
| Free to use Aseprite costs $19.99 (or compile from source) | ||
| Works in the browser Aseprite requires a desktop install | ||
| Drag & drop sprite upload Aseprite opens PNGs and imports file sequences as frames | ||
| Auto grid layout | ||
| PNG export | ||
| JSON atlas export | ||
| GIF export | ||
| Engine-specific formats Unity, Godot, Phaser, Tiled | ||
| Built-in pixel art editor Aseprite has a more advanced editor | ||
| Spritesheet splitting Aseprite has Import Sprite Sheet; ours runs on a dropped file with no project | ||
| Animation preview | ||
| Multi-layer support | ||
| Onion skinning | ||
| Advanced drawing tools Tilemap mode, shading, etc. | ||
| No account required | ||
| Command-line export Aseprite has a CLI for build pipelines |
Purpose-built for spritesheets
Every feature is focused on creating, splitting, and exporting spritesheets - not a secondary feature tucked into a menu.
No install, no license
Open a tab and start packing. Works on any device with a browser - Chromebook, tablet, shared machines.
Import from any editor
Export your frames from Aseprite, Photoshop, or any tool - then import them here for full control over the final spritesheet layout.
Engine-specific export
Export directly in formats optimized for Unity, Godot, Phaser, and Tiled. No manual JSON editing required.
More questions? See the full FAQ.
Pack what you drew
Export your frames from Aseprite, drop the folder here, pick your engine format.