Images take up 60% or more of a typical page's weight. Choosing the wrong format adds kilobytes for no reason. WebP, PNG, and JPEG each solve different problems. Here is how to pick the right one and convert between them.
JPEG — Best for Photos
JPEG is the default for photographs and complex images with gradients. It uses lossy compression, which means it discards some data to shrink file size. The result is a small file with acceptable quality loss for human eyes.
- Use for: photos, hero images, product photos, blog post images
- Supports: 24-bit color, no transparency
- Typical size: 50–200 KB for a 1200px photo
PNG — Best for Graphics and Transparency
PNG uses lossless compression. Every pixel is preserved exactly. It also supports full alpha transparency, making it the only choice for logos, icons, and UI elements that need sharp edges over variable backgrounds.
- Use for: logos, icons, screenshots, text-heavy graphics, transparent assets
- Supports: 24-bit color + alpha channel, lossless
- Typical size: 20–500 KB depending on complexity
WebP — The Modern All-Rounder
WebP is Google's modern format. It supports both lossy and lossless compression, plus transparency. At similar quality, WebP files are 25–35% smaller than JPEG and 26% smaller than PNG. Browser support is now above 95%.
- Use for: everything — photos, graphics, transparent assets
- Supports: lossy, lossless, transparency, animation
- Typical size: 30–150 KB for a 1200px photo
Format comparison table:
| Feature | JPEG | PNG | WebP |
|---|---|---|---|
| Lossy compression | Yes | No | Yes |
| Lossless compression | No | Yes | Yes |
| Transparency | No | Yes | Yes |
| Animation | No | No | Yes |
| Browser support | 100% | 100% | 95%+ |
Step 1: Choose the Right Format
Start with the content type. Photos get JPEG or WebP. Logos and icons get PNG or WebP. If you need transparency and older browser support, PNG is the safe fallback. For everything else, WebP wins on size.
Step 2: Compress Without Visible Quality Loss
All formats benefit from compression. For JPEG, target 75–85 quality. For PNG, use tools that reduce color palettes without destroying edges. For WebP, start at 80 quality and adjust. Always compare the compressed result against the original at 100% zoom.
Pro tip: Serve WebP with a JPEG fallback using the <picture> element. Browsers that support WebP load the smaller file; older browsers fall back to JPEG automatically.
Step 3: Use Responsive Images
One image size does not fit all devices. Use srcset and sizes to serve appropriately sized images for mobile, tablet, and desktop. A 1200px image on a 375px mobile screen wastes bandwidth.
Responsive image example:
<img srcset="small.webp 480w, medium.webp 768w, large.webp 1200w"
sizes="(max-width: 600px) 480px, (max-width: 1024px) 768px, 1200px"
src="medium.webp" alt="Product photo">Step 4: Convert Images Instantly
Stop opening Photoshop for simple format changes. The Image Converter converts between JPEG, PNG, WebP, and more in seconds. Drag and drop, pick the output format, and download the result.
Browse all tools: AllOmnitools.com/all-tools/ – 20+ free online utilities, no account required.