WebP vs JPEG: Which Format Should You Use?

If you've been compressing images for the web, you've probably run into both JPEG and WebP. They look similar on screen, but they're very different under the hood. The short answer: WebP is smaller at the same quality, but JPEG is still the safe default when you're not sure who's viewing your content.

Here's a practical breakdown.

What's the actual size difference?

WebP consistently produces files 25–35% smaller than JPEG at equivalent visual quality. On a photo-heavy page with 20 images averaging 200 KB each as JPEG, switching to WebP could cut 1–1.5 MB per page load — a meaningful improvement for Core Web Vitals and mobile users.

The gap is even bigger with transparency. WebP supports alpha channels (like PNG) while being far smaller than PNG. A PNG logo that's 150 KB might be 30–40 KB as WebP.

When to use JPEG

JPEG is 30 years old and universally supported. Use it when:

You're emailing images — older email clients don't render WebP
You're exporting for print — print workflows expect JPEG or TIFF
You're uploading to platforms that re-encode anyway — Instagram, Facebook, and WhatsApp will re-compress your image regardless of what format you upload, so the format matters less
You need maximum compatibility — if your audience includes users on very old browsers or devices

JPEG is also simpler to work with in legacy systems. If you're not sure, JPEG is the safe fallback.

When to use WebP

WebP is the right choice for:

Website images — all modern browsers (Chrome, Firefox, Safari 14+, Edge) support WebP natively
Product photos and hero images — the size savings directly improve page speed scores
Images with transparent backgrounds — WebP replaces both JPEG (photos) and PNG (transparency) in one format
Large galleries — when you have dozens of images, the cumulative size reduction matters

If you control the web server, you can even serve WebP to browsers that support it and JPEG as a fallback — but for most projects, just using WebP everywhere works fine in 2025.

What about AVIF?

AVIF is the next step after WebP — files are 40–50% smaller than JPEG at the same quality. Browser support is now solid (Chrome, Firefox, Safari 16+), but encoding is slower and some CDNs don't handle it well yet.

For most projects today: WebP is the sweet spot between compression and compatibility. AVIF is worth experimenting with if you're already on a modern image pipeline.

Quality settings matter more than format

A JPEG at 95% quality is larger than a WebP at 80% quality, but visually identical to the naked eye. The format is less important than finding the right quality setting for your content.

A practical rule: Start at 80% quality for web images. For photos where detail matters (portfolios, product shots), go up to 85–90%. For thumbnails and decorative images, 70–75% is fine.

Try it yourself

You can compare the results directly in your browser — no account or upload needed:

Compress images as WebP or JPEG — drag in any image and switch between formats to see the size difference live
Convert and compress with quality control — adjust quality from 10–100% and watch the file size update

The best way to pick a format is to compress the same image both ways and compare the file sizes at the quality level you're happy with. For most web photos, WebP at 80% wins every time.

Summary

	JPEG	WebP
File size	Baseline	25–35% smaller
Browser support	Universal	All modern browsers
Transparency	No	Yes
Email / print	Yes	No
Best for	Safe fallback, email, print	Web images, galleries, transparency

Use WebP for anything going on a website. Use JPEG when you need universal compatibility or are working outside the browser. Either way, compress before you ship.