How to Convert JPG to WebP Online Free

Converting your JPG images to WebP is one of the fastest and most impactful optimisations for website performance. WebP produces files 25–35% smaller than JPG at the same visual quality — meaning your pages load faster, your Core Web Vitals scores improve, and visitors on mobile connections have a significantly better experience.

The WebP Advantage in 2025

In 2025, WebP support is universal across all major browsers — Chrome, Firefox, Safari (since 2020), Edge, and all modern mobile browsers. There is no longer a meaningful compatibility concern for WebP on the web. The file size savings are consistent and real: Google's own data shows WebP reduces JPEG file sizes by 25–34% at equivalent quality settings.

How to Convert JPG to WebP Online

1. Open the Image Converter at imgresizr.com.
2. Upload your JPG file.
3. Select WebP as the output format.
4. Set quality to 80–85% for the optimal quality/size balance.
5. Click Convert and download your WebP file.
6. Replace your JPG with the WebP version in your website's assets.

Batch Converting JPGs to WebP

Use Your CMS or CDN for Bulk Conversion

For websites with hundreds of existing JPG images, manual one-by-one conversion isn't practical. WordPress 5.8+ automatically generates WebP versions of newly uploaded images. Cloudflare's Polish feature automatically serves WebP to compatible browsers. Cloudinary and Imgix can dynamically convert images on-the-fly based on the browser's Accept header.

Prioritise Largest Files First

If you're manually converting your image library to WebP, start with your largest files — hero images, featured images, and product photos. These have the greatest impact on page load time. Small thumbnails and icons can be converted later as they contribute less to total page weight.