There is no single "best" image format — only the best format for a specific job. This guide gives you a simple decision path so you never have to guess again.
Ask three questions
- Is it a photograph or a graphic? Photographs compress well with lossy formats (JPG, WebP, AVIF). Graphics with flat colours and sharp edges belong in lossless formats (PNG, WebP) or vectors (SVG).
- Do you need transparency? If yes, rule out JPG. Use PNG, WebP, AVIF or SVG.
- Where will it be shown? Modern website → WebP/AVIF. Email or older software → JPG/PNG. Infinite scaling (logos, icons) → SVG. Print → TIFF or high-quality JPG in the correct colour profile.
Format-by-format cheat sheet
- JPG — photos, thumbnails, anywhere small size matters and transparency doesn't.
- PNG — logos, screenshots, diagrams, images needing crisp edges or transparency.
- WebP — the modern all-rounder; smaller than JPG and PNG with full transparency support.
- AVIF — the smallest files of all, ideal for image-heavy pages where every kilobyte counts.
- SVG — logos, icons and illustrations that must stay sharp at any size.
- GIF — mostly legacy; for animation, MP4/WebM are far more efficient.
A flowchart you can memorise
Need infinite scaling? → SVG. Otherwise, is it a photo? → yes: WebP/AVIF (fallback JPG); no: does it need transparency or sharp edges? → yes: WebP/PNG; no: WebP/JPG. That single chain covers the vast majority of real-world decisions.
Don't forget the workflow
Keep a high-quality master (PNG or your editor's native file) and export web-ready copies from it. Never edit-and-re-save lossy files repeatedly — quality degrades each time. When in doubt, convert to WebP: it is the safest modern default.