Best Image Formats for Websites in 2025
Choosing the right image format directly impacts your website's performance, SEO ranking, and user experience. With new formats like WebP and AVIF gaining broad browser support, the landscape has shifted significantly. This guide covers every format you should consider in 2025 and when to use each one.
JPG: still the workhorse
JPG remains the most widely supported image format on the web. It offers excellent compression for photographs, with quality level 80-85 providing a good balance between file size and visual fidelity. JPG does not support transparency or animation. Use it as a fallback when newer formats are not supported.
PNG: when you need transparency
PNG is essential for images that require transparency, such as logos, icons, and overlays. PNG-8 works well for simple graphics with limited colors, while PNG-24 handles complex images with full color depth. The downside is larger file sizes compared to JPG for photographic content.
WebP: the modern default
WebP is supported by all major browsers and offers 25-35% smaller files than JPG at equivalent quality. It supports both lossy and lossless compression, transparency, and animation. For most websites, WebP should be your default format in 2025. Use the HTML picture element to serve WebP with JPG fallback for older browsers.
AVIF: the next generation
AVIF delivers even better compression than WebP, with files typically 20% smaller. Browser support has expanded rapidly, with Chrome, Firefox, and Safari all supporting it. The trade-off is slower encoding times, which can be an issue for dynamic image processing. Consider AVIF for static assets where you can encode once and serve many times.
SVG: for vector graphics
SVG is the only vector format on this list, meaning it scales to any size without quality loss. Use SVG for logos, icons, illustrations, and any graphic that needs to look sharp on all screen sizes. SVG files are often smaller than their raster equivalents for simple graphics and can be styled with CSS.
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