Best Image Format for Websites in 2026
Quick answer — best image format for websites
The best image format for most websites in 2026 is WebP. It produces files 25–35% smaller than JPEG at the same quality, supports transparency like PNG, and works in all modern browsers. As a result, switching to WebP is the single biggest image optimisation you can make for your website.
Use WebP for almost everything on your website. Use PNG only when you need lossless quality for editing purposes. Use AVIF for maximum performance if your audience is on modern browsers.
Image format overview for websites
Before choosing the best image format for your website, it helps to understand what each format offers:
- WebP — best all-round choice. 25–35% smaller than JPEG, supports transparency, 97%+ browser support.
- AVIF — best compression (40–50% smaller than JPEG) but newer browser support (~85%). Ideal for performance-first sites.
- JPEG — universal compatibility but larger files than WebP. Still useful for email and older platforms.
- PNG — lossless quality with transparency. Only use when image quality must be pixel-perfect, such as logos for editing.
For a deeper comparison of all formats, see our guide on JPG vs PNG vs WebP vs AVIF.
Best image format for each website use case
The best image format for your website depends on the type of image. Here is a practical breakdown for every common use case:
Image formats and SEO — what Google says
Choosing the best image format for your website is not just about visual quality — it directly affects your SEO rankings. Google uses page speed as a confirmed ranking factor, and images are the largest contributor to page weight on most websites.
According to Google's image best practices, using modern formats like WebP and AVIF is one of the recommended steps for improving Core Web Vitals scores. Furthermore, Google's PageSpeed Insights tool will specifically flag JPEG images and recommend converting them to WebP or AVIF.
In addition to format choice, make sure to:
- Add descriptive alt text to every image
- Use descriptive file names (e.g.
blue-running-shoes.webpnotIMG_001.webp) - Resize images to their display dimensions before uploading
- Add
widthandheightattributes to prevent layout shift
Best image format for WordPress websites
For WordPress websites, WebP is the best image format. WordPress has natively supported WebP since version 5.8, so you can upload WebP files directly to the media library without any plugins.
However, if you have an existing library of JPEG images, converting them all manually is time-consuming. Instead, consider using one of these approaches:
- Convert before uploading — use our free image converter to convert JPG to WebP in bulk before uploading to WordPress.
- Use a plugin — plugins like ShortPixel, Smush, or Imagify automatically convert and serve WebP versions of your images.
- Use a CDN — many CDN services like Cloudflare automatically convert and serve images in the best format for each browser.
Install the free ShortPixel plugin and run a bulk optimisation on your existing media library. It converts all your JPEG images to WebP automatically and serves them to browsers that support it, with JPEG as a fallback for older browsers.
Future-proofing your website images
While WebP is the best image format for websites today, AVIF is likely to become the dominant format over the next few years. AVIF achieves 40–50% smaller files than JPEG and is already supported by Chrome, Firefox, and Safari 16+.
To future-proof your website, consider using the HTML <picture> element to serve AVIF to browsers that support it, with WebP as a fallback:
This approach serves each user the best format their browser supports, without sacrificing compatibility. As a result, you get maximum performance for modern browser users while maintaining support for everyone else.
Frequently asked questions
Is WebP always the best image format for websites?
WebP is the best choice for most web images in 2026. However, SVG is better for logos and icons since it scales perfectly to any size. Additionally, AVIF gives better compression than WebP for audiences on modern browsers. Nevertheless, for general use across all image types, WebP is the safest and most effective choice.
Should I use PNG or WebP for logos on my website?
If your logo is a raster image, WebP is better than PNG for web use because it produces smaller files while supporting transparency. However, SVG is the best format for logos overall because it scales perfectly at any resolution without any quality loss.
Does the image format affect page load speed?
Yes — significantly. Converting from JPEG to WebP typically reduces image file sizes by 25–35%, which directly reduces page load time. For a page with 10 images averaging 200KB each, switching to WebP can save 500KB–700KB of page weight, which translates to noticeably faster load times.
What image format does Google recommend for websites?
Google recommends using modern image formats — specifically WebP and AVIF — through its PageSpeed Insights tool and Core Web Vitals guidance. Furthermore, Google's own websites and services use WebP extensively.