How to Convert PNG to WebP for Faster Website

If your website uses PNG images — particularly for transparent backgrounds on logos, icons, or UI elements — converting them to WebP can reduce file sizes by 25–35% with no visible quality difference and with full transparency support preserved. This improvement in load time directly affects your Core Web Vitals scores and user experience on mobile connections.

WebP vs. PNG for Web Performance

WebP's lossless compression (which preserves transparency just like PNG) produces files approximately 26% smaller than equivalent PNG files on average. For common web graphics like logos at 200–400px wide, the difference between PNG and WebP lossless might only be 5–20KB — but multiplied across every page load and every visitor, the cumulative savings significantly improve overall site performance.

How to Convert PNG to WebP for Your Website

1. Open the Image Converter at imgresizr.com.
2. Upload your PNG file.
3. Select WebP (Lossless) for images with transparency or sharp graphics.
4. Select WebP (Lossy) for photographs or complex illustrations where a small quality trade-off is acceptable for further size reduction.
5. Download and replace your PNG files in the website's assets folder.

Deploying WebP PNGs on Your Website

Update HTML/CSS References

After converting, update your HTML and CSS to reference the new .webp files. Check all <img> tags, CSS background-image properties, and any JavaScript that dynamically loads images. If using a CMS like WordPress, the plugin system handles this automatically.

Provide PNG Fallbacks for Older Browsers

While virtually all modern browsers support WebP (95%+ coverage in 2025), you can provide PNG fallbacks using the HTML <picture> element for the tiny minority of older browsers. Most developers now skip fallbacks entirely, as the browsers that don't support WebP represent less than 2% of web traffic globally.