What is a sprite sheet and why is it used in game development?

A sprite sheet is a single image file that contains multiple smaller images (sprites or frames) arranged in a grid. Game engines load this single image and use the JSON data to render specific parts of it, which is much more efficient than loading hundreds of individual small image files.

What format is the JSON data map in?

The JSON file is generated in a format compatible with many popular game development frameworks like Phaser or PixiJS. It typically includes a 'frames' object where each key is the original filename, and the value contains the 'frame' (x, y, width, height) and 'sourceSize' information.

What happens if my images have different sizes?

This tool calculates the layout based on the largest width and height among all uploaded images. Each cell in the grid will be sized to fit the largest image plus padding. Smaller images will be placed at the top-left corner of their cell.

Can I use this sprite sheet generator for CSS sprites?

Yes. While the JSON format is geared towards game engines, the generated sprite sheet image and the coordinate data within the JSON can be easily adapted for use in CSS to create animated sprites or reduce background image requests on a website.

Is this a free tool and are my images safe?

Yes, our sprite sheet maker is completely free. All processing is done client-side in your browser, meaning your images are never uploaded to our servers, ensuring your work remains private and secure.

Free Online Sprite Sheet Maker - Generate Sprite Sheet with JSON

Drag & drop images here, or click to select frames

PNG, JPG, WebP supported. Max 5MB per image.

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