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Start with the image, not the file extension
Format decisions become straightforward when you identify the asset’s constraints first. Ask:
- Is it a photograph, screenshot, logo, diagram, icon, or illustration?
- Can the image tolerate small visual changes, or must every pixel match?
- Does it need transparent pixels, animation, high color depth, or infinite scaling?
- Which browsers and versions does your audience actually use?
- What dimensions will users see, and what file size is acceptable on that device and connection?
Lossy compression discards some image data to reduce bytes. Lossless compression preserves the source exactly, although the resulting file may be larger. The right quality setting depends on the actual image and encoder; a quality value such as “80” is not comparable across formats or tools. See MDN’s compression guide.
Quick format guide
| Format | Best fit | Important strengths | Watch-outs |
|---|---|---|---|
| JPEG | Still photographs and broadly compatible fallback images | Lossy compression and extensive browser support | Artifacts are obvious around text, logos, and hard edges; no alpha transparency |
| PNG | Lossless screenshots, diagrams, logos, and transparent graphics | Exact reproduction and full alpha transparency | Often larger than modern lossy formats for photographs |
| WebP | General web delivery when modern browser support is available | Lossy and lossless modes, alpha transparency, and animation | Still provide a fallback when your audience includes unsupported clients |
| AVIF | Modern still or animated images where efficient compression matters | Transparency, animation, and higher color depths | Compatibility is more time-sensitive; verify support and use a fallback |
| SVG | Icons, interface graphics, logos, and geometric illustrations | Scales cleanly at different sizes | Not a replacement for photographic raster images |
| GIF | Simple, limited-palette animation | Widely recognized animated-image format | Limited to 256 colors and can be much larger than a video element |
| JPEG XL | Projects that specifically need its feature set and controlled clients | Lossy/lossless modes, progressive decoding, transparency, and animation | Browser support is not universal and must be checked for your audience |
For format definitions and current compatibility details, consult MDN’s image-format guide and web.dev’s format guidance.
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Photographs: JPEG, WebP, or AVIF?
Use JPEG when compatibility is the priority
JPEG is a practical still-photo format when you need a fallback that works across a wide range of browsers and software. Export at the lowest quality that still looks correct at the intended display size. Repeatedly opening and saving a JPEG can compound artifacts, so keep a high-quality source and encode the web copy from it.
Use WebP as a dependable modern option
WebP supports both lossy and lossless compression, transparency, and animation; its specification is published as RFC 9649. Google reports that lossy WebP images were 25–34% smaller than comparable JPEG images at equivalent SSIM quality in its published comparison. That is Google’s comparison, not a guarantee for every photograph, encoder, or setting. Measure your own assets using visual inspection and file-size checks; Google’s WebP documentation explains the format.
Use AVIF when your audience and pipeline support it
AVIF supports still and animated images, transparency, and higher color depths. It can be an excellent first choice for a modern audience, but support changes over time and varies by client. Offer WebP or JPEG as a fallback rather than assuming every browser can decode AVIF. Do not treat a single published compression percentage as universal: results vary with source content, encoder, settings, and metric.
Screenshots, diagrams, logos, and text-heavy graphics
Sharp edges expose lossy artifacts quickly. Colored fringes, ringing, and blurred one-pixel lines can make a UI screenshot or logo look unprofessional even when the file is small.
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- Test lossless WebP as a possible smaller alternative to PNG.
- For a logo or icon made from paths and shapes, use SVG so it remains sharp at every size.
- If the graphic contains photographic backgrounds plus text, test WebP or AVIF carefully at the actual rendered dimensions.
Do not assume PNG is always the smallest option: it is lossless, while a modern format may reproduce the same visual result with fewer bytes.
Transparency and animation
Transparent images
PNG provides full alpha transparency and is a dependable choice for precise cutouts, overlays, and UI assets. WebP and AVIF also support transparency, so compare them with PNG using the same dimensions and inspect semitransparent edges against the page background. JPEG does not carry an alpha channel; use a deliberately composited background instead.
Animated images
WebP and AVIF support animation. GIF remains useful for simple, constrained-palette animations, but web.dev notes that GIF is limited to 256 colors and can create significantly larger files than a video element. For longer or photographic motion, compare an appropriately encoded video rather than defaulting to GIF.
SVG: the scalable choice for interface artwork
SVG describes vector geometry, making it well suited to icons, diagrams, logos, and interface elements that must render accurately at multiple sizes. It is not a general-purpose container for photographs. Keep raster images as raster sources and use SVG where the artwork is fundamentally paths, shapes, and text.
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Deliver alternatives instead of betting on one format
When browser coverage is mixed, use the HTML picture element. Put the preferred modern format first and a broadly supported fallback last:
<picture>
<source srcset="hero.avif" type="image/avif">
<source srcset="hero.webp" type="image/webp">
<img src="hero.jpg" alt="Description of the scene" width="1600" height="900">
</picture>The browser selects a supported source; the img remains the fallback and supplies the accessible alternative text. Server-side content negotiation can provide the same strategy when your infrastructure already varies responses by the client’s accepted formats.
Serve the right dimensions
Encoding cannot compensate for an image that is several times larger than its rendered size. Generate responsive variants and use srcset and sizes, or use an image CDN that can resize and select a suitable format for each device. web.dev describes image CDNs as one way to automate this workflow in its image-performance guide.
A repeatable quality-and-size test
- Classify the asset. Record whether it is photographic, text-heavy, transparent, animated, or vector artwork.
- List required features. Eliminate formats that cannot provide alpha, animation, color depth, or scaling you need.
- Export candidates. Produce JPEG, WebP, AVIF, PNG, or SVG versions at the actual display dimensions and realistic encoder settings.
- Inspect at display size. Look closely at faces, gradients, text, one-pixel lines, transparency edges, and dark areas. Also zoom in to find artifacts that may become visible on high-density screens.
- Compare bytes. Record each resulting file size. Never compare encoder quality numbers as though they were a common scale.
- Check delivery compatibility. Verify current browser support for your audience and configure a fallback with
pictureor server negotiation. - Measure the page. Check transfer size, layout dimensions, caching, and loading behavior on representative mobile and desktop connections.
Common mistakes and fixes
Using PNG for every photograph
PNG preserves pixels but may send far more data than necessary for a photo. Compare a visually acceptable WebP, AVIF, or JPEG export.
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Lossy blocks and ringing around sharp edges are conspicuous. Start with SVG or PNG, then test lossless WebP.
Shipping AVIF without a fallback
A client that cannot decode AVIF may show a broken image. Add WebP and JPEG fallback sources and verify with the browsers your users actually run.
Choosing by extension alone
The same format can look excellent or poor depending on dimensions, source material, encoder, and settings. Inspect the output and keep the source asset available for re-encoding.
Serving oversized files
Resize to the largest likely display size and provide responsive variants. A smaller, correctly sized image often saves more than changing formats alone.
Or skip the browser setup
If you are evaluating formats from website screenshots, ScreenshotNeo can capture a URL through one API request. It accepts cookie and consent banners like a visitor, removes more than 60 known consent platforms plus newsletter popups and chat widgets before capture, and reports whether a response was a clean shot, cache hit, bot check, blank page, timeout, or failed load. Only clean shots are billed; bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing.
cURL (see the ScreenshotNeo documentation):
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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FAQ
Is WebP always smaller than JPEG?
No. Google’s published 25–34% comparison is not a universal result. Your source image, encoder, settings, and quality target determine the outcome, so test both.
Can I convert a JPEG to PNG to improve quality?
No. PNG can prevent additional loss during later edits, but it cannot restore detail already discarded by JPEG encoding. Return to the original source when possible.
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Should a logo be SVG or PNG?
Use SVG when the logo is vector artwork and must scale cleanly. Use PNG when you need a raster export, exact pixel rendering, or compatibility with a system that does not accept SVG.
Frequently Asked Questions
Does changing an image’s extension convert its format?
No. Renaming a file does not re-encode it. Use an image tool or build pipeline that writes the selected format and verify the resulting MIME type.
Which format should I use for a transparent photograph cutout?
Compare transparent WebP, AVIF, and PNG at the intended size. Keep PNG when exact edges or compatibility matter; choose a modern format only after checking your audience’s support.
Why can two files with the same dimensions have different sizes?
Compression method, image content, metadata, color depth, encoder, and quality settings all affect bytes. Dimensions alone do not predict file size.
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