GameImageToolkit Atlas Packer

At a glance

• Editor score
  7.6 / 10
• Pricing
  Free plan
• Best for
  Free browser packing with animation and project saving
• Free plan
  Yes
• Paid from
  Free
• Sprite trimming
  Yes
• Facts checked
  14 Nov 2026

• Where it wins

  • Trims transparent margins while retaining original size and offset in metadata.
  • Supports rotation, multiple atlas pages, padding, and edge extrusion.
  • Exports metadata for engines and formats including Unity, Godot, and Phaser.

• Where it doesn't

  • Its browser-extension deployment may not suit every workflow.
  • A 16,384 px browser canvas limit may constrain some projects.
  • Animation clips require frames named with animation sequences.

Our verdict on GameImageToolkit Atlas Packer

GameImageToolkit Atlas Packer is a free browser-based tool for arranging sprite images into one or more texture atlases. It is aimed at solo developers and small teams who need to prepare sprite sheets and engine-ready metadata without a paid plan. MaxRects bin packing and automatic size search handle placement; trimming transparent margins, optional 90-degree rotation, padding, and edge extrusion give users control over atlas layout. Processing runs locally in the browser, and the vendor says files are not uploaded.

Its export and animation features make it more than a basic packing utility. It can output PNG atlases and metadata for Unity, Godot, TexturePacker, Cocos, Phaser, Spine, libGDX, DragonBones, and CSS sprites. Frames named with animation sequences can be grouped into clips, with animation data and Godot animations available for export. Atlas occupancy and sprite bounds can be previewed, and projects can be saved and reopened. Those features are useful when iterating on a game asset set or handing packed resources into one of the supported workflows.

The trade-off is its browser-extension deployment and the stated 16,384 px browser canvas limit, which may be inconvenient for projects that need a different workflow or very large canvas operations. The tool supports per-page maximum side-size settings and can split overflow across atlas pages, but those controls do not remove the browser canvas limit. Choose it for free in-browser packing, project continuity, and animation-aware exports; look elsewhere if browser-extension use or the canvas ceiling conflicts with your pipeline.

Your product? Our editors can test GameImageToolkit Atlas Packer in depth and publish a review, labelled as paid · from $149/mo →

GameImageToolkit Atlas Packer pricing

GameImageToolkit Atlas Packer fact sheet

Alternatives to GameImageToolkit Atlas Packer

• AAsepriteA focused desktop editor for pixel animation, tilemaps, and sprite-sheet export.9.3
• LibreSpriteA free, open-source pixel-art editor with animation and sprite-sheet export.8.4
• APAtlas PackerA free atlas packer with practical trimming, preview, and common engine exports.8.1

See all GameImageToolkit Atlas Packer alternatives →

Featured on iTechGuides

GameImageToolkit Atlas Packer is listed in our Sprite Sheet Maker Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

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Last updated 14 Nov 2026 · How we research and update