AI sprite sheet generator
Turn your character into an animated sprite sheet
Give your hero a run, your explorer a walk, or your slime a bounce. Start from a character idea or your own reference and choose the moves for your game.
The short answer
Create a sprite sheet from a character prompt or a reference image in Summer Engine. Choose Idle, Run, Walk, Punch or a custom motion. Each animation downloads as an 8-frame PNG strip: eight equal cells in one horizontal row.
Choose a character idea below to fill an editable prompt, or start with your own. Opening an idea does not start generation. Generation uses credits and the account access shown in Studio.
Choose your starting point
Create, pack or convert a sprite sheet
Make new animation with AI, browse existing sprites, or use the free browser tools with your own files.
Animate a character with AI
Start with a prompt or reference, choose motions and press Generate in Studio. Requires the account access and credits shown there. Download an 8-frame PNG strip; no JSON atlas.
OpenPack existing frames
Already drew or exported the frames? Arrange them in your browser with the free packer. Download a PNG atlas and JSON frame coordinates. It does not create new poses or a GameMaker animation.
OpenBrowse existing sprites
Find a starting asset, then inspect its preview, file details and license before use. Check whether it contains the motion and frames your game needs.
OpenGIF to sprite sheet
Turn an animated GIF into a PNG atlas and a JSON list of frame positions and timing.
OpenSlice a PNG sprite sheet
Set the grid for your PNG sheet, then download separate PNG frames and their JSON frame list in a ZIP.
OpenSprite sheet to GIF
Choose your PNG sheet’s grid, frame rate and loop setting, then download an animated GIF. GIF colors and transparency are limited.
OpenStart here
Choose a character idea
Pick an idea and make it yours. Each opens the generator with an editable character prompt.
Platformer hero
Start with a side-view adventurer, then choose the moves your platformer needs in Studio.
OpenRPG explorer
Give a fantasy explorer a look, then bring it to life with a walk, run or custom move.
OpenSlime enemy
Try a simple creature. Choose a preset move or describe its motion in the form.
OpenHow it works
How the sprite sheet generator works
From one character to a set of moves in three steps.
1. Start with a character
Describe a character or add your own reference. Without a reference, Studio first generates one character image for the animation tasks.
2. Choose its moves
Run is selected initially. Add Idle, Walk, Punch or a custom motion, then press Generate. Each selected move uses the same character reference.
3. Take it into your game
Download the sheets for your animation workflow, or import them from Studio with a project open in the Summer Engine desktop app.
Motions
Choose an animation
Build a set for your character, from a quiet idle to an attack. Choose one or several moves.
Idle
Give your character an idle loop. This is separate from the still character reference.
Run
A run to the right for a side-view character. This is the initial selection.
Walk
A walk to the right for explorers, townspeople and side-view adventures.
Punch
A punch to the right for a brawler or action character.
Custom
Describe a slime bouncing, a character raising a staff, or another clear action.
Export
Bring the animation into your engine
The AI download is an 8-column, 1-row PNG strip. Divide its full width by 8 to get the frame width; the frame height is the full image height. Check the actual file dimensions before slicing.
| Engine | Import step | Animation setup |
|---|---|---|
| Summer Engine | Import from Studio with a desktop project open | Configure the animation in your project |
| Godot 4 | Add frames from the sheet to SpriteFrames using 8 columns and 1 row | Frame order and AnimatedSprite2D playback |
| Unity | Use Sprite Mode Multiple and slice by an 8 by 1 cell count | Frame order and Animation clip playback |
| GameMaker | Import the sheet as 8 frames with 8 frames per row | Frame size, origin and sprite playback speed |
Worked example
How to format a sprite sheet for GameMaker
Worked example: an 8-frame strip measuring 3168 × 336 px has cells of 396 × 336 px. Frames are not necessarily square. Use your downloaded PNG dimensions if they differ.
1. Open the strip importer
Create a sprite. In its Inspector, choose Import Strip, or open the Image Editor and use Image → Import Strip Image. Select the PNG to open Convert to Frames.
2. Check all eight cells
Use the settings below for this example. Confirm every cell contains one complete pose, ordered from left to right. If a cell cuts off feet or includes part of the next pose, check its size and spacing against the source image.
3. Set origin and playback
Choose a consistent origin, such as Bottom Centre for a standing character. Try 8 frames per second: eight frames take one second. Preview for alignment jumps and unwanted end-to-start changes, then check playback in your game.
| Setting | Example value | How to check your file |
|---|---|---|
| Number of Frames | 8 | One frame for each pose |
| Frames per Row | 8 | All eight frames are on one horizontal row |
| Frame Width | 396 px | 3168 ÷ 8; divide your strip width by its frame count |
| Frame Height | 336 px | The full height of this single-row PNG |
| Cell and Pixel Offsets | 0 | Only when there is no outer border or starting offset |
| Horizontal and Vertical Separation | 0 | Only when there are no gutters between cells |
Import a strip, not a packed atlas
The free packer can place images of different sizes on multiple rows, with padding. Its JSON records each frame rectangle; it is not a GameMaker importer format. For equal-cell slicing, use evenly sized frames in a regular layout or import your original frame images separately.
Check the animation in context
A shared origin cannot fix a character that shifts within its frames. Adjust alignment where needed. The editor preview loop setting does not configure game behavior; test the transition and timing in your own scene.
For AI agents
Prepare the Studio form with an AI agent
Use the Summer Engine MCP to fill the Studio prompt and motion controls with your AI agent.
Describe your character
Turn a character idea into a filled Studio prompt.
Fill the sprite-sheet prompt with a small slime enemy with two large eyes.Choose the motion
Select a preset move or add a custom action in the same form.
Select Walk and add a custom bouncing motion for the slime.Honest limits
A few things to know
Generated frames need a look
Character details, poses and alignment can vary. Check the sheet before use; a simpler motion can help.
Background removal
The workflow removes the background. Inspect the edges for leftover pixels or missing details.
PNG output
Each AI animation is an 8-frame PNG strip, without a JSON atlas or character controller. Set up cropping, frame order and playback in your engine.
AI sprite sheet generator FAQ
- How do I start a sprite sheet?
- Choose a character idea on this page or open the generator. Describe a character or add your own reference, choose its motions, then press Generate in Studio.
- Does choosing an idea start generation?
- No. It fills an editable character prompt. Generation starts when you press Generate in Studio.
- Is generation free?
- Generation uses credits and the account access shown in Studio. Opening the form does not generate or spend credits.
- Can I use my own character image?
- Yes. Add your character as a reference image. Studio can animate from that reference; without one, it first generates a character image.
- Which animations can I choose?
- Idle, Run, Walk, Punch and custom motions. Run, Walk and Punch use right-facing motion prompts. Each downloaded animation has 8 frames in one horizontal row.
- Does the AI generator export PNG and JSON?
- The AI animation download is PNG only. The separate free sprite-sheet packer exports a PNG atlas and JSON frame coordinates from images you supply. Its JSON is not a GameMaker animation importer.
- Can I request pixel art?
- Yes. Describe a pixel-art character and the look you want in the prompt.
- Can I use the result in another engine?
- Download the PNG strip and configure its frame size, origin and playback in your engine. Studio also has an import action for an open Summer Engine desktop project.
Build a game around your character
Download Summer Engine for macOS or Windows. Bring your sprite sheets into a project and build the world around them.