Corundum Spritepacker review
A free, open-source CLI atlas packer with trimming, JSON metadata, and frame checks.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Corundum Spritepacker is a pre-alpha command-line utility for turning PNG sprite frames into texture atlases. It is aimed at solo developers and small teams working with sprite sheets, especially those who want an open-source tool that can validate directional animation sets. The workflow accepts file names or glob patterns, trims transparent padding, and can deduplicate pixel-identical frames after trimming. Sprite pivots, including full-canvas pivots, are configurable. The project is built with C++23 and CMake and supports Windows, macOS, and Linux.
Packing is a notable strength for projects with more frames than fit on one sheet: Spritepacker uses MaxRects and can emit multiple numbered atlas sheets. Users can configure padding and the maximum sheet size, up to 2048 pixels. Output consists of PNG atlas images and corresponding JSON metadata. Its animation checks focus on consistency across facings, making it useful for spotting uneven directional frame sets as part of an asset pipeline. This is a focused packing and validation utility rather than a general-purpose graphical sprite editor, so teams wanting a visual editing workflow should look elsewhere.
The project is free and open source, with no paid tiers described. That makes it a fit for developers comfortable with a CLI and a tool that is still under active development; the pre-alpha status is a meaningful consideration for production pipelines. Choose it when multipage packing, trimming, deduplication, metadata export, and frame consistency checks matter more than a polished interface or a larger sheet-size ceiling. If the 2048-pixel maximum or pre-alpha maturity is unsuitable, another atlas tool may be a better match.
Corundum Spritepacker pros and cons
- Where it wins
- Trims transparent padding and deduplicates identical frames after trimming
- Packs multiple MaxRects atlas sheets with PNG and JSON output
- Checks animation-frame consistency across facings
- Where it doesn't
- Pre-alpha software is still under active development
- Maximum atlas size is 2048 pixels per sheet
- Command-line workflow may not suit users seeking a graphical editor
Corundum Spritepacker fact sheet, pricing and score →
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