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Practical knowledge on image formats, compression, and web performance.

The English edition is being built incrementally. The full German blog has 75+ articles available today.

JPG vs JPEG — is there a difference?

The short answer: no. The long answer takes us back to the 1980s — DOS, the Joint Photographic Experts Group, and a 3-character extension limit.

AVIF is 20–30% smaller than WebP at the same quality. Browser support, strengths, weaknesses and when AVIF makes sense in 2025.

Smaller files, better quality, broad browser support. Everything you need to know about WebP.

Photos or graphics? Transparency or file size? The differences and when to pick which.

GIF is 37 years old and still everywhere. Animated WebP is smaller and better. When should you switch?