The Best Image Format for the Web
Page speed lives or dies on image weight — here's which format to reach for depending on what you're actually publishing.
Images are usually the single biggest contributor to a slow-loading web page, and the format you save them in has a bigger effect on load time than almost any other single decision. There's no one "best" format for every case — the right choice depends on what the image actually contains — but a few clear rules cover nearly every situation a website runs into.
Photos and photographic content: WebP first, JPG as a fallback
For photographic images — product photos, hero banners, blog headers, anything with continuous tones and natural detail — WebP is the strongest default in 2026. It typically produces files 25-35% smaller than an equivalent-quality JPG, and every modern browser (Chrome, Firefox, Safari, Edge) renders it natively with no plugin or special handling required.
The one caveat: a small number of older tools, some email clients, and certain legacy content systems still don't handle WebP gracefully. If your image pipeline needs to guarantee compatibility with genuinely old software, keep a JPG fallback on hand — a `
Screenshots, UI graphics, and anything with transparency: PNG or WebP
For flat-color graphics, screenshots, and icons — especially anything that needs a transparent background — PNG has long been the standard, and it's still a perfectly good choice. WebP, however, supports transparency too, and generally compresses this kind of content even more efficiently than PNG while looking identical. If you're optimizing hard for page speed and don't need maximum legacy compatibility, converting graphics with PNG to WebP is a quick, no-quality-loss way to shave off real file size.
Logos, icons, and illustrations: SVG when possible
If your image is actually vector artwork — a logo, an icon, a simple illustration — SVG beats every raster format on the table. It's typically tiny in file size, scales to any resolution with zero blur (crucial for high-DPI "retina" screens), and can be styled or animated with plain CSS. The catch is that SVG only works for genuinely vector content; it's the wrong tool for a photo. When you do need a raster fallback of an SVG — for a favicon generator, an email signature, or a platform that doesn't accept vector uploads — SVG to PNG keeps the transparent background intact, while SVG to JPG is better suited to a flattened preview where file size matters more than transparency.
What about GIF?
For actual animation, GIF still shows up constantly, but of everything on this list, it's the one most in need of retiring: only 256 colors to work with, and it shows the moment anything more complex than a flat icon or simple graphic is asked of it. If you only need a single still frame pulled out of a GIF (a thumbnail, for instance), GIF to PNG gets you a sharper, full-color still image. For real animation, modern alternatives like WebP or video-based formats generally beat GIF on both quality and file size, though switching away from GIF often means changing how the animation is embedded, not just re-exporting the same file.
The format doesn't replace compression
Choosing the right format gets you most of the way to a fast-loading page, but it's not a substitute for actually compressing the image. A WebP exported at 100% quality can still be needlessly large. Whatever format you land on, running the final image through Compress Image — with a quality setting or a specific target size — is worth doing as a last step before publishing.
Quick reference
- Photo, general web use: WebP (JPG fallback if you need broad legacy support)
- Screenshot or graphic with flat color: PNG or WebP
- Needs a transparent background: PNG or WebP
- Logo, icon, or simple illustration: SVG, rasterized to PNG only when a platform requires it
- Animation: GIF still works, but expect larger files than modern alternatives
Every conversion and compression step above runs entirely in your browser — nothing is uploaded to test or compare formats, so it costs nothing to try a couple of options and compare the resulting file sizes yourself before deciding what to publish.