There is no single best image format for every website image. Use SVG for scalable geometric artwork such as logos and icons; AVIF or WebP for many photographs and raster images when their quality and browser support fit your audience; JPEG for broadly compatible photographs; and PNG when lossless detail or transparency matters. For modern formats, provide a fallback with <picture> if your audience may use browsers that do not support them.
Start with the kind of image you have
Choose a format according to the image’s visual content and what it needs to do. A photograph is made of continuous tones and detail; a logo or diagram is usually made of crisp shapes and edges. Compression that looks fine on a photo may make text or sharp edges look visibly damaged.
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| Image or requirement | Good starting choice | What to check |
|---|---|---|
| Logo, icon, diagram, chart, or line art | SVG | SVG scales cleanly because it describes geometry rather than a fixed grid of pixels. It is not a good substitute for a complex photographic scene. Keep important, selectable text as HTML text where practical. |
| Photograph or continuous-tone image | AVIF or WebP; JPEG as a broadly compatible fallback | Compare visual quality at an acceptable file size. Lossy compression can change fine detail and color. |
| Screenshot, sharp text, or flat-color graphic | PNG or lossless WebP/AVIF | Inspect edges and text carefully: lossy compression artifacts can be conspicuous in these images. |
| Transparent image | PNG, WebP, or AVIF | JPEG does not support an alpha channel. Compare the output size and appearance among formats that support transparency. |
| Animation | WebP, AVIF, or APNG | Check browser and workflow support. For many animations, video may be a better fit; GIF is limited to 256 colors and may be larger than comparable video. |
| Broad reach, including older browsers | JPEG or PNG fallback | Use a <picture> element to offer newer formats before a compatible fallback. |
These are starting points, not guarantees. For representative images, compare candidate formats at the dimensions you will actually serve and assess both byte size and visual quality.
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AVIF and WebP
AVIF and WebP can be useful for raster images when they deliver the quality you need at a smaller size. Both support lossy and lossless encoding and transparency; the cited format guidance also describes animation support. Their actual results depend on the image and encoding choices, so do not assume that either will always be smaller or look better. Check browser coverage for your audience and include a fallback when needed. MDN’s image format guide summarizes format capabilities and fallback options.
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Google’s WebP documentation, last updated August 7, 2025, reports that WebP lossless images are 26% smaller than PNG images and that lossy WebP images are 25–34% smaller than comparable JPEG images at equivalent SSIM quality. Those are published comparisons, not guaranteed savings for an arbitrary image collection; test your own representative assets. Google Developers: An image format for the Web.
JPEG
JPEG remains a practical choice for photographs when broad compatibility is important. It is lossy and does not support transparency. If JPEG’s compatibility is useful but its file size or quality is not ideal, compare it with AVIF and WebP at the same display dimensions.
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PNG
PNG provides lossless imagery and transparency, making it a dependable choice for images where exact edges or transparency matter. It is not automatically the best choice for every transparent image: WebP and AVIF also support transparency, and may be smaller for a particular asset.
SVG
SVG is suited to artwork built from scalable geometry, including many logos, icons, diagrams, and line illustrations. It stays crisp at different display sizes. Use raster formats for photographic scenes, and avoid turning text that should be selected, searched, or resized into a raster image; HTML text and web fonts are often more appropriate.
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Serve modern formats with a fallback
A regular <img> has one image source. A <picture> element lets the browser choose among typed sources it supports, with the nested <img> acting as the fallback. Put meaningful alternative text and intrinsic dimensions on that <img>.
<picture>
<source srcset="/images/landscape.avif" type="image/avif">
<source srcset="/images/landscape.webp" type="image/webp">
<img src="/images/landscape.jpg"
alt="Mountain landscape at sunrise"
width="1600" height="900">
</picture>The browser uses the first supported matching source and falls through to the JPEG image if the newer types are not supported. Keep the fallback file available at the declared path, and ensure every candidate depicts the same content and crop.
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Match image dimensions to the page
Format is only one part of delivery. A raster image much larger than its rendered dimensions can waste bytes; an image too small for a high-density display can look soft. Supply appropriate intrinsic dimensions and, when an image appears at different sizes, use responsive candidates with srcset and sizes so the browser can select a suitable file for the viewport and device-pixel ratio. web.dev’s image performance guide covers dimensions, responsive candidates, and format fallbacks.
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src="/images/product-800.jpg"
srcset="/images/product-400.jpg 400w,
/images/product-800.jpg 800w,
/images/product-1200.jpg 1200w"
sizes="(max-width: 600px) 100vw, 600px"
alt="Blue ceramic mug"
width="1200" height="900">The sizes value should reflect the image’s intended rendered width in your layout; the example is only suitable if the image actually follows that layout. Generate candidate files at useful sizes rather than serving one oversized file to every visitor.
Choose compression by inspection, not by a universal setting
There is no compression-quality number that works for every image. Try different settings and compare the encoded bytes with the result at the size users will see. Pay particular attention to high-contrast text, thin lines, and sharp edges, where artifacts can be more visible. Squoosh and ImageOptim are among the tools named by web.dev; image optimization services are another option when a site needs automated transformations.
- Pick representative examples: a photo, a screenshot or text-heavy image, and any image with transparency.
- Encode each candidate format at realistic display dimensions and several quality settings.
- Compare the visual result at normal viewing size, especially edges, text, fine detail, and transparency.
- Record the smallest file that still meets your visual-quality requirements, then verify support and fallback behavior for your audience.
Consider loading performance in context
Smaller image files can reduce image transfer time and may help Largest Contentful Paint when the image is the page’s LCP candidate. The format alone does not determine a page’s performance: dimensions, compression, responsive selection, delivery, and the image’s role on the page all matter. Check the actual page and representative devices rather than treating a format switch as a guaranteed performance improvement. See web.dev’s image performance guidance.
Or skip the browser setup
If you need a screenshot of a web page rather than an image file for a page you are building, ScreenshotNeo provides a screenshot API and MCP server. Its one-call API returns a screenshot or PDF; for an image response, for example:
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Frequently Asked Questions
Does JPEG support transparent backgrounds?
No. JPEG has no alpha transparency; use PNG, WebP, or AVIF when transparency is required.
Can I use AVIF or WebP without a fallback?
That depends on browser support among your intended audience. Use a `
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