图片压缩格式2026：完整指南 [AVIF, WebP, JPEG]

The Format Landscape

2025 presents web developers with more image format choices than ever before. Understanding each format's purpose prevents analysis paralysis.

Image formats divide into two fundamental categories: raster (pixel-based) and vector. Within raster formats, we further distinguish between lossy and lossless compression approaches.

The 'best' format depends entirely on your specific image and use case. A one-size-fits-all approach guarantees suboptimal results for at least some of your images.

Raster Formats Compared

Detailed analysis of pixel-based image formats.

• AVIF: Best compression, excellent quality, full feature set. The future of web images.
• WebP: Mature middle ground. Better than JPEG, broader support than AVIF.
• JPEG: Universal fallback. Fast encoding/decoding. Still dominates by volume.
• PNG: Lossless with transparency. Essential for screenshots and graphics.
• GIF: Legacy animation format. Use AVIF/WebP animations instead when possible.

Vector Format (SVG)

SVG stands alone as the web's vector format, serving fundamentally different needs than raster formats.

SVG (Scalable Vector Graphics) stores images as mathematical descriptions rather than pixels. This makes SVG infinitely scalable—a logo SVG looks perfectly sharp at any size from favicon to billboard.

Use SVG for logos, icons, illustrations, charts, and any graphic with solid colors and defined shapes. File sizes are typically tiny (1-10KB) and can be styled with CSS.

Decision Framework

A practical framework for format selection.

• Is it a logo, icon, or illustration?: → SVG. No question.
• Is it a photograph?: → AVIF (primary) with WebP/JPEG fallbacks.
• Does it need transparency?: → AVIF or WebP for photos, PNG for graphics.
• Is it an animation?: → AVIF or WebP animation. GIF only as last resort.
• Must be pixel-perfect lossless?: → PNG or lossless AVIF.
• Unknown viewing environment?: → JPEG for guaranteed compatibility.