JPEG to WebP Converter — Improve LCP and Cut Image Weight

How to convert JPEG to WebP

1. Drop your JPEG files onto the converter above — files with .jpeg or .jpg extension are both accepted.
2. Click Convert on any individual file, or Convert all to process your entire batch at once.
3. Download individually or click Download all for a single ZIP archive.
4. Tip: keep the original JPEG as a fallback — use the HTML <picture> element to serve WebP to modern browsers and JPEG to older ones.

Local conversion — no upload, no file size cap

All JPEG files are converted locally in your browser. No upload means no file size cap and no wait time — convert a 500-image product catalog without sending a single file to an external server.

Once the page loads, conversion runs fully offline. Process a photo shoot on a laptop without reliable Wi-Fi — disconnect after page load and the converter continues working without interruption.

// JPEG has no transparency — direct encode to WebP
const canvas = document.createElement('canvas')
canvas.width = img.width
canvas.height = img.height
canvas.getContext('2d').drawImage(img, 0, 0)
// 0.92 quality: visually identical, 25–34% smaller
canvas.toBlob(cb, 'image/webp', 0.92)

Who converts JPEG to WebP

Shopify and WooCommerce store owners converting product photography to WebP for faster storefronts. Product images are often the Largest Contentful Paint (LCP) element — reducing their weight by 25–34% directly improves Google's Core Web Vitals score.

Photographers delivering client galleries who offer a web-optimized download option. Converting a JPEG gallery to WebP before upload reduces storage costs and client download times by 25–34%.

Blog and content teams converting post images for WordPress or Ghost. Smaller WebP images mean lower CDN costs, faster Time to First Byte, and better scores in PageSpeed Insights and Lighthouse.

JPEG vs WebP — format comparison

When to switch to WebP vs keep JPEG

Convert JPEG to WebP when:

• Shopify / WooCommerce — product images are the LCP element; WebP reduces load time directly
• WordPress 5.8+ — natively supports WebP uploads; your theme serves them automatically
• Next.js / Nuxt / Gatsby — image components auto-serve WebP with JPEG fallback
• CDN delivery — WebP files consume 25–34% less bandwidth and storage cost
• Core Web Vitals — LCP improvement from smaller images contributes to better Google ranking

Keep JPEG when:

• Email campaigns — Outlook and most email clients don't render WebP
• Print and photography — JPEG is the standard for print delivery and stock photo submissions
• Legacy CMS platforms — older systems may not accept WebP in media libraries
• Maximum compatibility needed — JPEG works in 100% of browsers, apps, and viewers

How the conversion works — and how to serve WebP safely

Your browser loads the JPEG into a hidden HTMLImageElement. On the load event, the image is painted onto an HTML5 Canvas, then encoded as WebP via toBlob() at quality 0.92 — equivalent perceptual quality to the source, 25–34% smaller.

To serve WebP with a JPEG fallback for older browsers, use the HTML <picture> element. Browsers that support WebP load it automatically; others fall back to the JPEG without any JavaScript.

<picture>
  <source type="image/webp" srcset="photo.webp">
  <img src="photo.jpg" alt="Product photo" width="800" height="600">
</picture>

<!-- Next.js handles this automatically: -->
<Image src="/photo.jpg" alt="Product" width={800} height={600} />