Choosing the right image format can reduce page size by 40-60% without losing quality. Let's break down each format and when to use it.
Format Comparison
| Format | Compression | Transparency | Animation | Support |
|---|---|---|---|---|
| JPEG | Lossy | No | No | 100% |
| PNG | Lossless | Yes | APNG | 100% |
| WebP | Both | Yes | Yes | 97%+ |
| AVIF | Both | Yes | Yes | 92%+ |
| SVG | Vector | Yes | Yes | 100% |
When to Use Each Format
JPEG โ Photos and Complex Images
Perfect for photos with millions of colors. Quality at 80-85% provides the best quality/size ratio.
PNG โ Graphics with Transparency
Logos, icons, screenshots โ whenever transparency or sharp text edges are needed.
WebP โ The Versatile Modern Format
25-35% smaller than JPEG at the same quality. Recommended for most cases.
SVG โ Vector Graphics
Scalable without losing quality. Ideal for icons, logos, and illustrations.
Image Conversion
Use Xuvero tools:
- Image Converter โ convert between PNG, JPG, WebP
- Image Compressor โ compress images without visible quality loss
- Image Resizer โ change image dimensions
SEO Optimization
- Lazy loading โ use
loading="lazy"for images below the fold - Alt text โ describe what's depicted for Google Images
- Dimensions โ always specify width and height to avoid CLS
- Srcset โ provide different sizes for various screens
