Slice, pack and convert
sprite sheets in your browser.

Yes. Slicing, packing, converting and exporting all run in your browser, so there is nothing for us to meter — no credits, no account and no watermark, however many sheets you make. The AI generators elsewhere on AnnoMotion do spend credits; this toolkit does not.

No. The toolkit on this page works without an account. If you already have one, the same toolkit is also in your dashboard.

No. The files you choose are read by your browser and processed on your own device. They are never sent to our servers, and nothing you make here is stored by us — so download your sheet or your frames before you close the tab.

Load the sheet as a PNG, WebP or JPG — or a GIF that holds a single image; an animated PNG or WebP is read as its first frame only — then give it either the number of columns and rows or the size of one cell — with an offset and a spacing if the sheet has a margin or gaps between frames. On a sheet with a transparent background the toolkit can also detect the grid, find sprites that were not laid out on a regular grid, and drop empty cells; a JPG, or a sheet on a flat background colour, needs that colour made transparent first, which the toolkit can do. When the toolkit is not sure of the layout it shows its best guess and leaves it to you to apply. You can preview the animation, and the frames download as PNGs in one zip.

Add your frame images. They are ordered by filename in natural order — frame2 before frame10 — and you can reorder them. Choose the number of columns and the padding, optionally trim every frame to the bounds they share and make the sheet power-of-two, then download it as a PNG. The packer lays frames out on a uniform grid of equal cells; it does not fit differently sized rectangles together the way a tight atlas packer does.

Both. An animated GIF can be split into frames or packed straight into a sheet, and a sheet can be exported as an animated GIF. A GIF too long for one sheet can keep every second (or third…) frame, or be scaled down, and be put back as it was. A GIF that holds a single image opens as a sprite sheet instead, ready to slice. GIF is an old format with real limits: at most 256 colours in a frame, and each pixel is either fully transparent or fully opaque. A sprite with soft, semi-transparent edges will look rougher as a GIF than it does as a PNG sheet. GIF timing is stored in hundredths of a second, and a GIF whose frames have different lengths is read at its average speed.

Yes, if your browser can play the video. The decoding is done by the browser itself, so which formats work depends on the browser you are using — MP4 and WebM are the usual ones, and a file your browser cannot play cannot be converted. The frames can be downloaded on their own or packed into a sheet. Frames are scaled down to 512 pixels on the longest side unless you pick another size, up to 2048 pixels.

Beside the sheet you can download, in one zip: a JSON atlas for Phaser and PixiJS (Aseprite's format), a JSON file of sprite rects and pivots for Unity (a reference for the Sprite Editor or an editor script — Unity does not import it by itself), a Godot 4 SpriteFrames .tres resource, GameMaker strips (an animation too long to fit one strip is left out, and the download tells you which), a CSS sprite stylesheet for the web, and a manifest, plus a README. Before you export you can name your animations — a range of frames with its own frame rate (from 0.1 to 60 frames per second) and loop setting — or create one clip per row in a single step.

It can make one solid background colour transparent, which is what a sheet exported on a flat colour needs. It is a colour key rather than an AI cut-out, so it suits a single flat colour and not a photograph or a gradient. When the background is one colour — a JPG's included, compression noise and all — the colour and a tolerance wide enough for it are filled in for you; on a pattern or a gradient (a chequerboard, say) the toolkit says so and leaves the colour and tolerance to you. A magenta, green or blue key colour is removed everywhere, including the gaps between a character's legs, unless you choose to remove it only from the edges in. The Trim the edge setting takes a pixel or two more off each sprite if a thin halo of the background is left.

A sheet can be up to 4096 × 4096 pixels in area and 8192 pixels on a side, with up to 1024 frames. A separate frame image, a GIF or a video frame can be up to 2048 pixels a side, with about 64 megapixels of frames loaded at once (half that once a background colour has been removed, because the originals are kept so you can undo it); an image or GIF file can be up to 64 MB and a video up to 256 MB. Everything is held in your browser's memory, and those ceilings keep the result inside what browsers and game engines load reliably.

No. Nothing is added to your frames or your sheet, and we make no claim on files you process here — what was yours going in is yours coming out.

Then you need something to make them, and the toolkit does not generate art. AnnoMotion's Spritesheet Generator animates a single character image into a transparent sprite sheet, and VFX / Particle Sprite Sheets does the same for an effect such as an explosion or smoke. Both are AI generators and spend credits; this toolkit is free whether you use them or not.