See what's heavy
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HTML5OptimizationFree Tool
Game Build Size Optimizer
Make your HTML5, Unity WebGL or Godot web build smaller. See what takes up space, remove junk files, recompress images and repack at maximum compression, free and entirely in your browser.
Drop your game build ZIP
Unity WebGL, Godot, Construct, Phaser or any HTML5 export. See what's taking up space, then download a smaller ZIP.
How the optimizer works
Optimize safely
Junk files are removed, JPEGs and JSON are recompressed, and everything is repacked at maximum compression. File names and folders stay the same.
Download and test
Get a smaller ZIP plus engine-specific tips for anything that has to be fixed in Unity, Godot or Construct.
Why build size matters
Every megabyte is time a player spends watching a loading bar, often on mobile data. Smaller web builds start faster, lose fewer players before the first tap, and fit within hosting limits such as PixelPicked's 50 MB cap for playable demos.
Frequently asked questions
How do I reduce the size of my HTML5 game build?
Start with the biggest wins: convert WAV audio to OGG or MP3, compress large PNG and JPEG images (WebP is often 25–60% smaller), remove junk files like source maps and __MACOSX folders, and zip the build at maximum compression. This tool does the last three automatically.
How do I make a Unity WebGL build smaller?
In Player Settings → Publishing Settings, set Compression Format to Gzip or Brotli. Lower texture Max Size and enable Crunch Compression, set audio to Vorbis, and set Managed Stripping Level to High. Unity packs assets into the .data file, so they have to be optimized inside Unity.
Will optimizing break my game?
Removing junk files, maximum ZIP compression and JSON minification don't change how your game runs. Converting images to WebP and downscaling images do change files, so they are off by default. Test the game after using them.
Is my build uploaded anywhere?
No. The ZIP is opened, optimized and repacked inside your browser. Nothing is sent to PixelPicked or anyone else.
What is PixelPicked's build size limit?
Playable demos on PixelPicked can be up to 50 MB as a ZIP. Smaller builds also load faster, which keeps more players past the loading screen.