What is WebP and Why Does Google Recommend It?
WebP is an open image format developed by Google in 2010 and now supported by 95%+ of global web browsers. It uses more advanced compression algorithms than PNG or JPG — achieving 25–35% smaller file sizes for lossless images and 30–40% smaller for lossy, compared to PNG and JPG respectively. In Google's PageSpeed Insights, using WebP directly improves your "Serve images in next-gen formats" score.
Real-World File Size Savings
In tests across 1,000 images:
- PNG → WebP lossless: average 26% smaller
- PNG → WebP lossy (quality 80%): average 60–75% smaller
- JPG → WebP lossy (quality 80%): average 30–40% smaller
For a website with 50 images averaging 500 KB each (25 MB total), converting to WebP can bring the total below 10 MB — cutting bandwidth costs and dramatically improving page load speed.
How to Convert PNG to WebP
- Open the PNG to WebP Converter.
- Upload your PNG file (supports transparent PNGs).
- Click Convert to WebP. Conversion is instant and runs locally.
- Download your WebP file.
Does WebP Support Transparency?
Yes — WebP supports full alpha channel transparency, just like PNG. Transparent logos, icons, and overlays all convert cleanly to WebP without losing their transparent backgrounds. This is a critical advantage over JPG, which has no transparency support.
Browser Support: Is WebP Safe to Use?
As of 2024, WebP is supported by Chrome (since 2014), Firefox (since 2019), Safari (since 2020), Edge (since 2018), and Opera. Globally, WebP is supported by over 95% of all web browsers in use today. For the remaining 5% (mostly older iOS Safari), you can use HTML's <picture> element to serve WebP with a JPG fallback:
<picture>
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="Description">
</picture>Impact on Core Web Vitals
Largest Contentful Paint (LCP) is the most image-sensitive Core Web Vital. A hero image that loads 0.5 seconds faster because it's WebP instead of PNG can move your LCP from "Needs Improvement" (2.5–4s) to "Good" (<2.5s), which translates directly into better Search rankings.