JPG to WebP: Should You Convert? When, Why and How

WebP is a modern image format that typically stores photos at 25–35% smaller sizes than JPEG while keeping the same visual quality. If your site is full of JPEGs, converting them is one of the simplest ways to speed it up. But it isn't always the right move — here's how to decide.

Why WebP beats JPEG for most photos

WebP uses more advanced compression than the decades-old JPEG standard, so it reaches the same perceived quality with fewer bytes. It also supports transparency and can be either lossy or lossless, making it far more flexible than JPEG, which is lossy-only and has no alpha channel.

When you should convert

• Your pages are image-heavy and load slowly
• You care about Core Web Vitals or mobile data usage
• Your audience uses modern browsers (nearly all do today)
• You want transparency without switching to PNG

When to keep JPEG

JPEG remains the safest choice for maximum compatibility — for example email clients, very old devices, or systems that only accept JPEG uploads. If a file is already a small, well-optimized JPEG, re-encoding it may bring little benefit. And remember that converting a lossy JPEG to WebP can't recover quality the JPEG already lost.

How to convert JPEG to WebP

In bulk, in your browser

The easiest approach is to drop your JPEGs into a batch tool, pick WebP as the output format, set quality around 75, and download the results. With Scrunch this happens entirely in your browser, so nothing is uploaded, and you can convert many files at once.

Choosing a quality value

Quality 70–80 is the sweet spot for photos: the file is much smaller and the difference is hard to see. If unsure, compare the before and after side by side and pick the lowest quality that still looks clean.

The bottom line

For most website photos, converting JPEG to WebP at quality 75 is a clear win in speed with no visible quality loss. Keep JPEG only where compatibility truly demands it.

Frequently asked questions

Does converting to WebP hurt quality?

At quality 75 the difference is very hard to see. WebP is lossy, but it stores the same visual quality in fewer bytes, so a WebP file usually looks indistinguishable from the original JPEG side by side. When unsure, compare before and after and adjust the quality.

What if an old browser can't display WebP?

Every major browser supports WebP today, so most sites have nothing to worry about. If you must support very old clients, you can provide a JPEG fallback using the picture element.

Can I re-convert an already-compressed JPEG to WebP?

Yes, though quality the JPEG already lost won't come back. The goal of converting is to reduce size while adding as little further degradation as possible, so converting from the original whenever you can gives the best result.

Can I convert many files at once?

Yes. Drop multiple JPEGs, choose WebP once, set a single quality, and it applies to every file. Scrunch processes this in parallel inside your browser, so even large batches convert quickly.