There are more image formats than most people realize, and each one was designed for a specific set of constraints. Knowing which format fits your use case prevents both bloated files and compromised quality. Here is a practical breakdown of the formats you will encounter most often.
JPG (JPEG)
The workhorse of web photography since the mid-1990s. JPG uses lossy compression optimized for continuous-tone images — photographs, complex scenes, anything with millions of smooth color transitions. It does not support transparency. Repeatedly saving and re-opening a JPG degrades quality each time because data is permanently discarded on every save. Use JPG for photographs, social media images, and any web content where file size matters more than pixel-perfect accuracy.
PNG
PNG provides lossless compression with full alpha transparency support. Every pixel is preserved exactly, making it ideal for logos, icons, screenshots, and any graphic where crisp edges matter. The cost is larger file sizes — a PNG photograph can be 5–10x larger than a JPG equivalent. PNG is also the standard format for images that will undergo repeated editing, since there is no generational quality loss.
WebP
Developed by Google, WebP supports both lossy and lossless compression, transparency, and animation. In lossy mode it matches JPG quality at 25–35% smaller file sizes. In lossless mode it beats PNG by 20–30%. Browser support is universal as of 2026. WebP is the strongest general-purpose format for web delivery, though some older email clients and applications may not render it.
AVIF
AVIF is the newer successor to WebP, based on the AV1 video codec. It offers even better compression — typically 20–50% smaller than WebP at equivalent quality. The tradeoff is encoding speed and browser support: AVIF is supported by Chrome, Firefox, and Edge, but Safari support arrived more recently and encoding is slower than WebP. AVIF is an excellent choice for performance-critical web applications where encoding time is acceptable.
GIF
GIF is limited to 256 colors, which makes it unsuitable for photographs but perfect for simple animations and low-color graphics. Its transparency is binary — a pixel is either fully transparent or fully opaque, with no semi-transparent blending. For modern animation needs, animated WebP or video formats (MP4, WebM) offer far better quality at smaller file sizes.
SVG
SVG is fundamentally different from the others: it is a vector format, not raster. Instead of a pixel grid, it stores shapes, paths, and mathematical descriptions. This means SVG scales infinitely without quality loss — a 100×100 SVG logo looks sharp at any size. It also means SVGs are ideal for logos, icons, diagrams, and illustrations that are built from geometric shapes. Photographs cannot be meaningfully represented as SVG.
Quick decision guide
- Photographs for web: WebP (lossy), with JPG as a fallback
- Logos with transparency: SVG first, then PNG or WebP (lossless)
- Screenshots: PNG for text clarity, WebP lossless for smaller size
- Simple animations: Animated WebP or MP4, not GIF
- Print production: TIFF or high-quality JPG/PNG depending on the workflow
- Performance-critical web: AVIF with WebP fallback