Sprite Sheet Packer — PNG Atlas + JSON Map

How it works

1. 1

   Upload frame images

   Add equally sized frames or icons, or resize first for uniform cells.

2. 2

   Define grid layout

   Set columns and spacing so each frame maps to a predictable cell position.

3. 3

   Add padding and spacing

   Insert pixels between frames to prevent bleeding in game engines or GPU filtering.

4. 4

   Preview the atlas

   Verify frame order matches your animation sequence or CSS coordinate map.

5. 5

   Download sheet + JSON

   Export a ZIP with sprites.png and sprites.json listing each frame’s x, y, width, and height.

Why use this tool

• •2D game animation frames in one texture atlas
• •CSS image sprites for legacy web icon sets
• •Emoji or sticker packs for chat app prototypes
• •UI icon bundles for mobile app design handoff

Frequently asked questions

Is this a sprite sheet packer or an AI sprite generator?

A packer. You supply existing frame or icon images; the tool combines them into one PNG atlas with JSON coordinates. It does not invent characters or animation frames from a text prompt.

What is a sprite sheet used for?

A sprite sheet combines many small images into one file. Games and websites load it once, then display regions as individual sprites or animation frames.

Do all frames need the same size?

Uniform cell sizes simplify animation math. This tool packs frames into equal cells; resize first if your sources differ.

PNG or WebP for sprite sheets?

This tool exports a PNG atlas in the ZIP. PNG is standard for transparency and broad tool support.

Why add padding between sprites?

Padding prevents color bleed from neighboring frames when GPUs sample textures with linear filtering.

Can I generate a JSON map file for the sprites?

Yes. Download includes sprites.json with each frame’s coordinates (x, y, width, height) keyed by the source file name, plus the combined PNG in one ZIP.

Is this the same as a photo collage?

No. A collage is a shareable grid of photos. A sprite sheet is a packed atlas with coordinates for games or CSS — use Collage when you want a finished montage.

Are my images uploaded?

No. Packing runs in your browser on your device.

How do I use a sprite sheet in CSS?

Set background-image to the sheet and shift background-position to show each icon cell by its x/y offset from the JSON map.

Related tools

• Resize Image
• Crop Photo Online — Free Aspect Ratio & Custom Crop
• File Conversion
• Photo Collage Maker Online — Grid Layout

Related guides

• Pack game sprites into one sheet + JSON
• Icon sprite sheet for web apps