Choosing the wrong image format can double your file size, break transparency, or reduce image quality. Here's a complete breakdown of every common web image format and when to use each.
Quick decision chart
| Use case | Best format |
|---|---|
| Photos and gradients | WebP (or JPEG as fallback) |
| Images with transparency | WebP (or PNG as fallback) |
| Logos and simple graphics | SVG (or PNG) |
| Animated content | WebP (or GIF as fallback) |
| Maximum compression (modern browsers) | AVIF |
| Screenshots with text | PNG |
| Print-quality images | TIFF or PNG |
JPEG / JPG
Best for: Photos, complex images with gradients, no transparency needed
JPEG uses lossy compression, discarding image data that's imperceptible to the human eye. It achieves excellent file sizes for photographs but is not suitable for images with sharp edges (text, logos) or transparency.
- Compression: Lossy
- Transparency: ❌ Not supported
- Animation: ❌ Not supported
- Browser support: Universal
- Typical use: Product photos, blog images, social media
PNG
Best for: Screenshots, logos, images requiring transparency or sharp edges
PNG uses lossless compression — no image data is discarded. This makes PNG ideal for graphics where pixel-perfect accuracy matters. PNGs can be large for photos but are necessary when transparency is needed and WebP isn't an option.
- Compression: Lossless
- Transparency: ✅ Alpha channel
- Animation: ✅ APNG (limited support)
- Browser support: Universal
- Typical use: Logos, UI screenshots, icons, diagrams
WebP
Best for: All web images where modern browser support is acceptable
WebP supports both lossy and lossless compression, transparency, and animation — making it a versatile replacement for JPEG, PNG, and GIF simultaneously. It's 25–35% smaller than JPEG at equivalent quality.
- Compression: Lossy and lossless
- Transparency: ✅ Supported
- Animation: ✅ Supported
- Browser support: All modern browsers (Chrome, Firefox, Safari 14+, Edge)
- Typical use: All web images for sites targeting modern browsers
AVIF
Best for: Maximum compression when browser support allows
AVIF (AV1 Image File Format) achieves 50% smaller files than JPEG at equivalent quality. Browser support is growing rapidly but still not universal.
- Compression: Lossy and lossless
- Transparency: ✅ Supported
- Animation: ✅ Supported
- Browser support: Chrome, Firefox, Opera (Safari 16+)
- Typical use: Next-generation web images where every KB matters
GIF
Best for: Short animations (legacy use — prefer animated WebP or video)
GIF is limited to 256 colors, making it poor for photos. It remains in use for simple animations where backward compatibility is required, but animated WebP or short MP4 video is superior in every way.
- Compression: Lossless (but limited palette)
- Transparency: ✅ 1-bit (no alpha)
- Animation: ✅ Supported everywhere
- Typical use: Simple animations on platforms without WebP support
File size comparison (same image)
| Format | File size | Notes |
|---|---|---|
| PNG | 450 KB | Lossless baseline |
| JPEG (85% quality) | 120 KB | Visible at 100% zoom |
| WebP (lossy) | 85 KB | Near-identical to JPEG quality |
| AVIF | 60 KB | Smallest, best quality |
Recommendation for web developers
Use this pattern in HTML for maximum compatibility:
<picture>
<source srcset="image.avif" type="image/avif">
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="Description" width="800" height="600">
</picture>
This serves AVIF to browsers that support it, WebP to those that don't, and JPEG as the universal fallback.