During school projects, artists often gave me sprites with dimensions like 543x981 or 1381x737.
Those can't be compressed to DXTn/BCn formats, thus bloating our final build size.
However, By resizing their dimensions to multiples of four, we witness significant smaller size:
 Original |
 Quad-Divisible (Way Smaller) |
- Resize textures to be quad-divisible with minimal quality loss
- Batch process multiple textures at once
- Works with PNG, JPG, TGA, EXR (TGA and EXR are usually quad-divisible already)
Package Manager - Install Package from Git URL
https://github.com/Maoyeedy/QuadSpriteProcessor.git
Or use OpenUPM CLI
openupm add com.maoyeedy.quad-sprite-processor
Note: Only supports Unity 2021.3 Onwards. (As it utilizes Texture2D.Reinitialize)
- (Multi-Select and) right-click assets in project panel.
- Resize to be Quad-Divisible
- Tools - Texture Processing
- Set path, Scan, Select, Process
- Bug Fixes (There can definitely be potential bugs, so Issues/PR are welcome)
- An option to use it as AssetPostprocessor, with some matching rules. So that it will auto-convert every sprite you import.
- Backup of the original sprites? (I think this bloats your unity project size. Also if you want to revert them, why not rely on VCS)
- For Tansparent-Background PNG, instead of resize, add transparent pixel to the border.
- Option to "Round to nearest power of two" (For mipmap needs)
As most of my projects are showcased with WebGL, I've been trying to squeeze my build size even smaller for faster loading time.
I once optimized a 2D game WebGL Build from 100MB to merely 40MB. For that, I wrote a custom Powershell script to recursively process all textures. However, that requires CLI and ImageMagick, so I made it integrated into Unity Editor to be more user-friendly.
Lastly, if you have never think about build size, I highly recommend ProjectAuditor, or manually open your Editor.log to check 'Build Report'. You may be very likely surprised at the results.