How to Reduce HTML5 Banner File Size Below 150 KB

Keeping an HTML5 creative near a 150 KB initial payload is a strong performance target, even though current Google Ads uploads can be up to 600 KB and CM360 display creatives up to 9.5 MB. Follow these compression strategies to improve load speed and reduce trafficking risk.

5 Actionable Compression Techniques

1. Convert PNGs to WebP / Lossy JPEGs: WebP files are up to 35% smaller than transparent PNGs while preserving image quality.
2. Use Google Hosted CDN Libraries: Replace bundled GSAP or jQuery scripts with Google's allowlisted CDN URLs.
3. Inline SVGs for Logos & Icons: Vector graphics take up fractions of a kilobyte when inserted directly into the HTML document.
4. Minify CSS & JavaScript: Remove whitespace, console logs, and comments using Terser or CSSNano.
5. Strip Image Metadata (EXIF): Remove camera metadata from exported assets.

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