The Three Core Web Image Formats
Choosing the right image format can dramatically improve your website's performance and visual quality. Here's when to use each format.
SVG (Scalable Vector Graphics)
SVG is a vector format — it describes images using mathematical shapes rather than pixels.
Best for:
- Logos and icons that need to be sharp at any size
- Simple illustrations, charts, and diagrams
- Animated graphics (CSS/JS animations on SVG elements)
- UI elements that must look crisp on retina/high-DPI screens
Advantages:
- Infinitely scalable — perfect quality at any size
- Very small file size for simple graphics
- Editable with CSS and JavaScript
- Accessible (text remains as text inside the SVG)
Limitations:
- Not suitable for photographs or complex images
- Can become very large for complex illustrations
PNG (Portable Network Graphics)
PNG is a lossless raster format — it stores every pixel exactly.
Best for:
- Screenshots and UI mockups where sharpness matters
- Images with transparency (PNG supports alpha channel)
- Illustrations with sharp edges and flat colors
- Images that will be edited further
Advantages:
- Perfect quality — no compression artifacts
- Supports transparency
- Great for text-heavy images
Limitations:
- Larger file sizes than JPG for photographs
JPG / JPEG (Joint Photographic Experts Group)
JPG is a lossy raster format — it discards some data to achieve smaller file sizes.
Best for:
- Photographs and realistic images
- Images with gradients and complex color variations
- When file size is the priority
Advantages:
- Excellent compression for photographs (often 10x smaller than PNG)
- Universally supported
Limitations:
- Lossy — quality degrades with each save
- No transparency support
- Compression artifacts visible at high compression levels
Quick Decision Guide
| Use Case | Best Format |
|---|---|
| Logo / Icon | SVG |
| Photograph | JPG (or WebP) |
| Screenshot with text | PNG |
| Image with transparency | PNG or SVG |
| Animated graphic | SVG or WebP |
| UI illustration | SVG or PNG |
The Modern Alternative: WebP
WebP, developed by Google, offers 25-35% better compression than both PNG and JPG while supporting transparency and animation. It is supported by all modern browsers and should be your default choice for raster images in 2024.
Use our free Image to Base64 Converter and SVG Viewer to work with your image files directly in the browser.