A banner that weighs 4 MB will hurt your page speed and your SEO. The good news: you can usually cut that by 80% with no visible difference.
Pick the right format
- WebP: best all-round quality-to-size, ~90% quality is invisible.
- AVIF: even smaller, great for photos, slightly slower to encode.
- JPEG: universal fallback.
- PNG: only when you need transparency or crisp text/logos.
BannerCrop AI shows a live file-size estimate as you change format and quality, so you can dial it in before downloading.