How to Convert JPG to WebP (and Why You Should)

JPG has been the default photo format for decades. It's everywhere — cameras, phones, stock photo sites, email attachments. But if you're publishing images on the web in 2026, there's a better option: WebP.

Converting your JPGs to WebP can shave 25-35% off your file sizes with no visible quality loss. That means faster page loads, lower bandwidth costs, and better Core Web Vitals scores. Here's everything you need to know.

What is WebP?

WebP is an image format developed by Google that supports both lossy and lossless compression. Think of it as a modern replacement for both JPEG and PNG — it handles photographs, graphics, and transparency in a single format, all at smaller file sizes.

Google introduced WebP back in 2010, but adoption was slow because Safari didn't support it until 2022. That's ancient history now. As of 2026, WebP is supported by over 97% of browsers globally — Chrome, Firefox, Safari, Edge, and every major mobile browser.

Why convert JPG to WebP?

The numbers speak for themselves:

• 25-35% smaller files at the same visual quality as JPG. A 200 KB JPEG becomes a 130-150 KB WebP.
• Faster page loads. Smaller images mean less data to transfer. On mobile connections, this is the difference between a page that feels instant and one that feels sluggish.
• Better SEO. Google uses page speed as a ranking signal. Lighter images directly improve your Core Web Vitals — especially Largest Contentful Paint (LCP).
• Lower hosting costs. If you serve millions of images, a 30% reduction in file size translates to real savings on CDN and bandwidth bills.

How to convert JPG to WebP with CompressLocal

You don't need to install software or upload your images to a server. CompressLocal's convert tool runs entirely in your browser — your files never leave your device.

1. Open the Convert tool.
2. Drop your JPG files onto the page (or click to browse). You can add multiple files at once.
3. Select WebP as the output format.
4. Adjust the quality slider if needed. 80% is a good default — visually identical to the original for most photos.
5. Click Convert and download your WebP files.

The entire conversion happens client-side using your browser's built-in Canvas API. No data is sent anywhere. This makes it safe for sensitive images — medical records, legal documents, personal photos — anything you wouldn't want on someone else's server.

When NOT to use WebP

WebP is excellent for the web, but it's not the right choice everywhere:

• Email attachments. Many email clients still don't render WebP inline. Stick with JPG or PNG for emails.
• Print workflows. Print shops expect TIFF, PDF, or high-quality JPG. WebP isn't part of the print ecosystem.
• Legacy systems. If you're integrating with older CMS platforms, document management systems, or hardware (digital signage, kiosks), verify WebP support first.
• Archival storage. For long-term archival, lossless formats like PNG or TIFF are safer bets since they're more universally supported by archival tools.

Serving WebP with a JPG fallback

Even with 97%+ browser support, you may want a fallback for the remaining edge cases. The HTML <picture> element makes this easy:

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

The browser picks the first format it supports. Modern browsers load the WebP; older ones fall back to JPG. The <img> tag acts as the final fallback and carries the alt, width, and height attributes for accessibility and layout stability.

What about AVIF?

AVIF is the next step beyond WebP. Based on the AV1 video codec, it can produce files 50% smaller than JPEG — even smaller than WebP. Browser support is growing (around 92% globally in 2026), but encoding is significantly slower, and some platforms still lack full support.

How much slower? Encoding a single AVIF image can take 5-10x longer than encoding the same image as WebP, which makes batch processing large image libraries noticeably painful. The tradeoff is worth it when you're serving high-traffic pages where every kilobyte saved translates to measurable bandwidth and performance gains — think hero images on landing pages or product photos on e-commerce sites with millions of daily visitors.

For most sites today, WebP is the practical sweet spot: wide support, fast encoding, and meaningful size savings. If you want to go further, you can serve AVIF with a WebP fallback using the same <picture> pattern above.