Picking the wrong image format quietly taxes everything you publish: pages load slower, files transfer heavier, and quality suffers for no reason. This is the practical comparison — what each format is good at, what it costs, and the decision to make for every common situation in 2026.
Not sure how your image fares in each format? Run it through the compressor with WebP and JPG output and compare size at the same visual quality.
Compare formats on my imageThe one-minute comparison
| JPG | PNG | WebP | AVIF | |
|---|---|---|---|---|
| Compression | Lossy | Lossless | Both | Both |
| Transparency | No | Yes | Yes | Yes |
| Animation | No | No (APNG rare) | Yes | Yes |
| Photo efficiency | Baseline | Poor | ~30% better than JPG | ~45% better than JPG |
| Browser support | Universal | Universal | All modern browsers | All modern browsers |
| Best for | Photos, compatibility | Screenshots, text, logos | Most web images | Next-gen photo delivery |
JPG — the universal baseline
JPEG has been the photo format for three decades. Every device, every browser, every upload form accepts it. Its lossy compression is well understood and good at photographic content. Choose JPG when: the receiving system demands it (common for official forms), you need animation-free photos with zero compatibility risk, or you're stuck on legacy tooling. Its weaknesses: no transparency, and it's now clearly beaten on size by WebP and AVIF.
PNG — precision over weight
PNG stores every pixel exactly. That makes it unbeatable for screenshots, diagrams, UI captures, and any graphic with sharp text or hard edges — and its alpha channel keeps transparency intact. For photos, it's the wrong tool: the same photo as PNG is commonly 5–10× the JPG size. If your PNG is heavy, read why PNG files get so big and what to do about it.
WebP — the 2026 default
WebP is what you should reach for first in almost every web context. It wraps JPG-class photo compression, PNG-class transparency, and GIF-class animation into one format, at sizes 25–35% below JPG for the same visual quality. Browser support is now universal among current browsers. The only real friction left is older software and systems that insist on .jpg files — for those, keep a JPG export path. Our compressor outputs WebP natively for exactly this reason.
AVIF — the frontier
AVIF squeezes photos even harder than WebP (another 15–25% at equal quality) and handles gradients exceptionally well. Two caveats: encoding is slow (fine for a build pipeline, sluggish for interactive tools), and support in older embedded contexts lags. Use it when your build system generates it automatically — the extra savings are real but incremental over WebP, not transformative.
And don't forget SVG
For logos, icons, and illustrations made of shapes, SVG isn't in the lossy comparison at all — it's vector, scales infinitely, and is usually a few KB. Icons should almost never be PNGs in 2026.
Decision cheat sheet
- Photo for a website: WebP (AVIF if your pipeline generates it)
- Photo for a form/portal that demands JPG: JPG compressed to the size limit
- Screenshot or diagram: PNG (or WebP lossy for sharing)
- Logo with transparency: SVG where possible, WebP otherwise
- Animated clip: WebP or a muted MP4 (far smaller than GIF)