JPG to WebP Converter

Take a typical product photo saved as a JPEG at 400 KB. Convert it to WebP and you will usually land somewhere around 260 KB, looking the same to anyone who is not pixel-peeping. Multiply that across a gallery of forty images and you have just cut several megabytes off the page.

The case for moving your photos to WebP

JPEG was finalised in 1992. It has aged remarkably well, but compression research did not stop, and WebP simply does the same job with better maths. For photographic content you can expect roughly a quarter to a third off the file size at matching visual quality.

That saving lands where it matters most: on mobile connections, where image weight is usually the single biggest reason a page feels slow. If Largest Contentful Paint is the metric holding your Core Web Vitals back, your hero image is almost certainly the culprit.

Converting JPEG to WebP

1. Upload or drag in the JPG you want to convert.
2. Pick a quality level — 75–85 covers almost every real use.
3. Convert and compare the file sizes.
4. Download the WebP.
5. Serve it with a <picture> element if you want a JPEG fallback for ancient clients.

Where the difference is most worth having

• Hero images and above-the-fold banners, which dominate your LCP score.
• E-commerce galleries, where a single product page might load thirty photos.
• Blog post images, which are often uploaded straight from a camera and never optimised.
• Background images in CSS, which block rendering while they download.
• Anything served to mobile users on a metered connection.

Do not convert twice

One point worth understanding: JPEG is already lossy, so converting it to lossy WebP means compressing an image that has been compressed once before. At sensible quality levels this is fine and nobody will notice. But if you still have the original camera file or the PNG export, converting that to WebP will always give you a better result than going through the JPEG.

Common questions