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For most website photographs and other raster images, use WebP as the practical default. Offer AVIF first when your delivery stack has dependable fallbacks and you have verified decoding performance. Use SVG for logos, icons, diagrams, and other geometric artwork. Keep JPEG or PNG as fallbacks when compatibility, exact detail, or transparency requires them. Format choice matters, but dimensions, responsive delivery, compression settings, and loading priority often matter just as much.
Quick answer: choose by image type and browser strategy
| Image need | Recommended format | Why | Fallback or caution |
|---|---|---|---|
| Photographs and hero images | AVIF or lossy WebP | Both can substantially reduce transfer size at useful visual quality. | Keep JPEG when your support matrix requires it; inspect quality at the displayed size. |
| Screenshots, interface captures, diagrams and line art | Lossless PNG, lossless WebP, or tested AVIF | Sharp edges and text make compression artifacts obvious. | Compare small text and 1px lines before replacing PNG. |
| Logos, icons and geometric illustrations | SVG | Vector paths stay sharp at any display size and are usually compact for simple artwork. | Do not use SVG as a substitute for photographic pixels; minify and compress the SVG source. |
| Animation | WebP or AVIF | Usually more efficient than GIF for animated raster content. | Use APNG when lossless animation is required. |
| Exact reproduction or transparency | PNG | Lossless encoding and alpha transparency are dependable. | File sizes can be larger than modern lossy formats. |
Google describes WebP as providing superior lossy and lossless compression for web images, and MDN calls WebP an excellent choice for still and animated images. MDN also recommends WebP or AVIF for raster images because they generally compress better than PNG, JPEG and GIF. AVIF can compress more aggressively and supports transparency, animation and higher color depths, but support limitations make a fallback plan important.
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What actually makes an image fast?
The browser must download, decode, lay out and paint an image. A smaller file usually reduces download time, but a modern format does not rescue an image that is many times larger than its rendered dimensions. Image guidance from web.dev connects efficient encoding with image download time and Largest Contentful Paint (LCP).
- Displayed dimensions: Resize the source to the largest size users will actually see. Sending a 4,000-pixel image into a 600-pixel slot wastes bytes in every format.
- Compression: Lossy encoding can discard information. Judge WebP or AVIF at the target display size, not only at 100% zoom.
- Responsive variants: Generate multiple widths and let the browser select an appropriate one with
srcsetandsizes. - Loading priority: Lazy-load below-the-fold images; do not lazy-load the primary above-the-fold image when it is your LCP candidate.
- Layout stability: Set explicit
widthandheight(or an equivalent aspect ratio) so the browser reserves space before the file arrives. - Decoding cost: Very large or complex AVIF files may save network bytes while requiring more CPU to decode. Measure on representative devices.
WebP versus AVIF
Choose WebP for the broad default
WebP supports lossy and lossless compression and works for still and animated images. It is a sensible single modern target when you want a simpler deployment, predictable tooling and a fallback for older clients.
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Choose AVIF when the extra compression is worth the complexity
AVIF often produces smaller files than JPEG or PNG and can beat WebP at comparable visual quality. It also supports alpha transparency, animation and higher color depths. Browser and device support is not uniform enough to assume AVIF-only delivery; serve WebP or JPEG/PNG after it and test decode time on the devices that matter to your audience.
Do not pick by extension alone
Encode representative photographs, screenshots and illustrations at several quality levels. Compare file size, text edges, gradients, transparency and decode behavior at the actual rendered dimensions. The best setting for a photographic hero image may be unsuitable for a UI screenshot.
When SVG is better than any raster format
SVG describes shapes and paths rather than storing a fixed pixel grid. That makes it the usual choice for logos, interface icons, diagrams and geometric artwork that must remain sharp across phones, high-density displays and large monitors. Remove unnecessary metadata, minify the markup and compress the text-based file. Use a raster format for photographs, textured artwork and other content whose detail is fundamentally pixel-based.
PNG, JPEG and GIF still have jobs
JPEG
JPEG remains a broadly compatible choice for photographs and a useful final fallback. It is lossy and does not provide alpha transparency, so it is a poor fit for a transparent logo or an image with crisp, flat text unless the quality trade-off is acceptable.
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PNG
PNG is lossless and supports transparency. It is often preferable for screenshots, line art and graphics where exact reproduction matters. A lossless WebP or tested AVIF may reduce the same image further, but inspect fine text and edges before switching.
GIF
GIF is widely recognized but inefficient for most modern animation and limited in color. WebP or AVIF is generally a better animated-raster choice; APNG is an option when lossless animation is essential.
HTTP Archive’s 2024 Web Almanac reported image usage of JPG 32.4%, PNG 28.4%, GIF 16.8%, WebP 12.0%, SVG 6.4% and other or unknown 1.7%. Those are observed web-usage shares, not a speed ranking; the report still recommends WebP as a primary format with JPEG/PNG fallbacks and AVIF where supported.
Serve AVIF and WebP with reliable fallbacks
Use a <picture> element. The browser evaluates sources in order and uses the first supported one; the nested <img> is the final fallback.
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<source type="image/avif"
srcset="/img/hero-480.avif 480w, /img/hero-960.avif 960w, /img/hero-1440.avif 1440w"
sizes="(max-width: 700px) 100vw, 70vw">
<source type="image/webp"
srcset="/img/hero-480.webp 480w, /img/hero-960.webp 960w, /img/hero-1440.webp 1440w"
sizes="(max-width: 700px) 100vw, 70vw">
<img src="/img/hero-960.jpg"
srcset="/img/hero-480.jpg 480w, /img/hero-960.jpg 960w, /img/hero-1440.jpg 1440w"
sizes="(max-width: 700px) 100vw, 70vw"
width="1440" height="900"
alt="Description of the scene"
loading="eager" decoding="async">
</picture>Use loading="lazy" for images below the fold, while keeping the primary visible image eager when appropriate. The exact quality numbers are image- and encoder-dependent; validate them against your own content instead of copying a universal setting.
A practical decision process
- Classify the source as photograph, screenshot/line art, geometric artwork or animation.
- Resize it to the largest rendered dimensions and create responsive widths.
- Encode a WebP candidate. Add AVIF if your browsers, CDN and processing pipeline support it reliably.
- Keep JPEG or PNG as the final fallback when compatibility or transparency calls for it.
- Inspect quality at the displayed size, including text, gradients, edges and transparent areas.
- Implement
<picture>,srcset,sizes, explicit dimensions and suitable loading priority. - Measure real page impact, especially LCP, transfer bytes and behavior on slower devices.
Troubleshooting common format problems
The AVIF image is not displayed
Check that the server returns the correct MIME type and that a WebP or JPEG/PNG source follows it in <picture>. Test the fallback by using a browser or device without AVIF support.
The “smaller” file looks worse
Lossy compression may remove text detail, thin lines or subtle gradients. Raise quality, choose lossless encoding for that asset, or retain PNG. Always compare at the CSS display size.
Mobile users download desktop-sized files
Verify the width descriptors in srcset and the CSS-width expression in sizes. Incorrect sizes values make the browser choose an unnecessarily large candidate.
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Add accurate width and height attributes or reserve space with CSS using the known aspect ratio.
CPU usage rises after switching formats
Compare decode time on representative low-power devices. A modestly larger WebP can provide a better end-to-end result than an expensive-to-decode AVIF.
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Frequently Asked Questions
Is WebP faster than JPG?
Often, WebP delivers similar visual quality in fewer bytes, but the page-level result depends on dimensions, quality settings, decoding and fallback behavior.
Can one image file serve every browser?
A single legacy format can maximize compatibility, while <picture> lets capable browsers receive AVIF or WebP and others receive JPEG or PNG.
Should a logo be PNG or SVG?
Use SVG when the logo is geometric or path-based and must scale; use PNG when the source requires fixed-pixel detail or dependable raster transparency.
Quick Recap
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