Sprite Sheet Packer — Texture Atlas Generator for Unity, Godot & Phaser

Upload Sprites

How to Use the Sprite Sheet Packer Online Free

Upload Your Sprites

Select multiple image files (PNG, JPG, SVG) from your computer. You can upload dozens of images at once.

Pack Sprites

Click the Pack Sprites button. Our algorithm will arrange the images efficiently into a single texture atlas generator online layout.

Export Data

Download the packed image and the accompanying JSON file containing the UV coordinates for each sprite.

About This Sprite Sheet Packer & Texture Atlas Generator for Game Engines

A sprite sheet packer is an essential tool for game developers and web designers looking to optimize performance. By combining multiple small images into a single larger file, you can significantly reduce the number of HTTP requests and draw calls, leading to faster load times and smoother animations.

Our free online texture atlas generator is designed with privacy in mind. Unlike other tools that require you to upload your assets to a server, Privacy Pix Tools processes everything locally in your browser. Your game assets and personal designs never leave your device.

Key Features of Our Sprite Sheet Creator:

Efficient Packing: Automatically arranges images to minimize wasted space.
JSON Export: Generates a standard JSON file with coordinates (x, y, width, height) for each sprite.
CSS Sprite Support: Perfect for creating CSS sprites to optimize web icons and UI elements.
Privacy First: Secure, no-upload processing ensuring your intellectual property remains private.
Free to Use: No registration or subscription required for the best free sprite sheet tool.

Frequently Asked Questions

What is a sprite sheet?

A sprite sheet is a single image file that contains multiple smaller graphics (sprites). It is widely used in 2D game development and web design to manage many small assets efficiently.

Why should I use a texture atlas generator?

Using a texture atlas generator online free helps in reducing memory overhead and improving rendering speed. Instead of the browser or game engine loading 50 separate images, it only loads one, which is much faster.

Does this tool support JSON coordinates?

Yes! Our online sprite sheet maker automatically generates a JSON data file alongside the image. This file contains the precise location and size of every sprite within the sheet.

Can I use this for CSS sprites?

Absolutely. You can create CSS sprites online free by packing your UI icons and using the generated coordinates in your CSS `background-position` properties.

Are my images uploaded to any server?

No. This is a secure sprite sheet maker no upload. All processing occurs locally on your machine using your browser's capabilities.

How do I use a sprite sheet in Unity?

Drop the packed PNG into your project's Assets folder, select it, and in the Inspector set Texture Type to Sprite (2D and UI) and Sprite Mode to Multiple. Open the Sprite Editor and slice the sheet — Automatic slicing works for irregular packing, or use Grid By Cell Size if your frames are uniform. Apply, then drag the individual sub-sprites into the scene or into an Animation clip. The exported JSON gives you exact frame rectangles if you prefer to slice by script instead of by hand.

Does this work for Godot 4?

Yes. Import the PNG into your Godot 4 project, add a Sprite2D or AnimatedSprite2D, and use an AtlasTexture (or the SpriteFrames editor) with the region rectangles from the exported JSON. For pixel art, set the texture's filter to Nearest in the Import tab so frames stay crisp. The same sheet and JSON also feed Phaser 3 directly via this.load.atlas().

Are my game assets uploaded anywhere?

No — everything stays on your device. The packing runs on an HTML canvas inside your browser, and the PNG and JSON are generated and saved locally. Unreleased character art, tilesets and UI kits never leave your machine, so there is nothing to leak from a server and no account or licence to worry about.

🔎 Verify it yourself: nothing uploads

Don’t take our word for it. Open your browser’s DevTools (F12 → Network tab), then run this tool on any image. You’ll see no upload request at all — your file never leaves this tab. You can even turn off Wi‑Fi once the page has loaded and keep working. Every tool on this site works the same way — all processing happens on your device.