Understanding Image Formats

Choosing the right image format can dramatically affect your website's performance, visual quality, and SEO ranking. This guide breaks down the most common formats.

JPEG (.jpg / .jpeg)

Best for: Photographs, complex images with gradients.

JPEG uses lossy compression, meaning some data is discarded each time the file is saved. This makes JPEG files very small, but repeated editing degrades quality.

• ✅ Very small file sizes
• ✅ Universally supported
• ❌ No transparency support
• ❌ Loses quality when re-saved

PNG (.png)

Best for: Logos, illustrations, images requiring transparency.

PNG uses lossless compression — no data is lost. Files are larger than JPEG but retain perfect quality.

• ✅ Supports transparency (alpha channel)
• ✅ Perfect quality for text/lines
• ❌ Larger file sizes than JPEG

WebP (.webp)

Best for: Web images — the modern replacement for both JPEG and PNG.

Developed by Google, WebP provides 25–35% better compression than JPEG at equivalent quality, with support for transparency.

• ✅ Smaller than JPEG & PNG
• ✅ Supports transparency
• ✅ Excellent for Core Web Vitals
• ❌ Older browsers may not support it (though coverage is now >97%)

SVG (.svg)

Best for: Icons, logos, illustrations that need to scale to any size.

SVG is an XML-based vector format. Unlike the others, it doesn't store pixels — it stores drawing instructions, so it looks perfect at any resolution.

• ✅ Scales infinitely without quality loss
• ✅ Small file size for simple shapes
• ✅ Can be animated with CSS
• ❌ Not suitable for photographs

Quick Decision Guide

TNPixel Tip: Use our Image Optimizer tool to convert and compress your images to the best format automatically.