Convert Images to WebP to Reduce Website Loading Speed by 30%

Why Image Format Affects Website Speed

Images account for 50–70% of total page weight on most websites. A page with five 500 KB JPG images takes longer to load than the same page with five 300 KB WebP images. The difference in user experience and search engine ranking adds up fast.

Google PageSpeed Insights explicitly recommends "Serve images in next-gen formats" and flags JPG and PNG images when WebP equivalents would be smaller. This recommendation affects your Core Web Vitals score, which is a direct Google ranking factor.

How Much Smaller Is WebP?

According to Google's own research:

• WebP lossless images are 26% smaller than PNG
• WebP lossy images are 25–34% smaller than comparable JPG images
• WebP with transparency is 3× smaller than GIF

In practice, the savings depend on the content of the image. Photographs with complex colors save 20–30%. Screenshots and graphics with flat colors can save 40–60%.

Does WebP Support Transparency?

Yes. Unlike JPG, WebP supports a full alpha channel (transparency). This means you can use WebP instead of PNG for transparent logos and overlays and get a much smaller file.

WebP Browser Support

As of 2024, WebP is supported by:

• Chrome (since version 9, 2011)
• Firefox (since version 65, 2019)
• Safari (since version 14 on macOS, 2020)
• Edge (since version 18, 2018)
• iOS Safari (since iOS 14, 2020)

Global WebP support is over 97%. For the remaining 3%, you can serve a JPG or PNG fallback using the HTML <picture> element.

How to Convert Images to WebP

1. Go to ILoveConvert → Image Convert
2. Upload your JPG, PNG, or GIF image
3. Select WebP as the output format
4. Set quality to 85 (good balance of size and quality)
5. Download and replace the original on your server

Using WebP on Your Website

The simplest approach is to replace your image files with WebP versions and update your HTML or CSS references. For example, change image.jpg to image.webp.

For safe cross-browser support, use the HTML picture element:

<picture>
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description">
</picture>

The browser picks WebP if it supports it, or falls back to JPG.

WordPress and WebP

WordPress 5.8+ supports WebP natively. You can upload WebP images directly in the Media Library. Some performance plugins (like Smush or Imagify) automatically convert uploads to WebP on the server.

What Quality Setting Should I Use?

For photographs: 80–90% quality gives excellent results with significant size savings. For product images where detail matters: 90–95%. For graphics and logos: use lossless WebP (100% quality) to avoid compression artifacts on hard edges.

Measuring the Impact

After converting your images to WebP, test your page speed at:

• Google PageSpeed Insights (pagespeed.web.dev)
• GTmetrix
• WebPageTest

A typical website switching fully to WebP sees a 20–40% reduction in total page weight and a corresponding improvement in load time.