WebP vs JPEG - Quality, Size, and Browser Support

Use WebP for images on your own website, and JPEG for everything that leaves it: email attachments, client deliverables, print, and uploads to systems you don't control. WebP usually gives a smaller file at similar visual quality and also supports transparency and animation. JPEG opens everywhere. To make WebP copies of your JPEGs, use the free Image Converter and compare the sizes yourself before switching.

WebP vs JPEG at a glance

File size: the main reason to switch

Google's WebP documentation reports that WebP lossy images are typically smaller than comparable JPEGs. In practice, the saving depends on several things:

• Image content. Smooth areas such as skies, skin, and studio backgrounds tend to benefit more than dense, noisy detail.
• Quality setting. Comparing a WebP at 80% with a JPEG at 80% isn't a fair test, because the two scales don't match. Compare files that look the same, not files with the same number.
• The source file. Converting a JPEG that was already compressed hard often saves little, because the encoder also has to preserve the artifacts JPEG introduced.

To measure the difference for your own images, convert a handful with the Image Converter at 75-85% quality. Compare the file sizes, then view both versions at 100% zoom.

Visual quality

At high quality settings, most people can't tell WebP and JPEG apart. The differences show up when you push file sizes down:

• JPEG degrades into 8×8 blocks, ringing around sharp edges, and color banding.
• WebP tends to blur fine detail and smear textures instead of showing blocks.

Which looks worse depends on the image. Text overlays and hard UI edges are tough for both, so use higher quality or a lossless format for those.

How to run a fair test on your own images

Before switching a whole site, compare the two formats on five or six representative images, such as a product shot, a busy landscape, a portrait, and a screenshot.

1. Start from the same high-quality original for both versions, for example mug-original.png at 3000×3000.
2. Resize it to the size you'll actually serve, for example 1200×1200, with the Image Resizer (both boxes set to 1200).
3. In the Image Converter, make mug.webp at 80% and, separately, mug.jpg at 80%.
4. Open both at 100% zoom. If one looks worse, raise its quality and convert again until they look the same.
5. Now compare file sizes. That's the real difference for your content.

If the WebP saving is small across most of your images, the extra format may not be worth the workflow change.

Compatibility: where JPEG still wins

WebP display support is now standard in browsers (caniuse.com/webp). Outside the browser, support is uneven:

• Some email clients won't preview WebP attachments inline.
• Older versions of desktop photo viewers, office suites, and print-shop upload forms may reject WebP.
• Government, school, and insurance portals often list "JPG or PNG only."
• A client who receives a .webp file may not know how to open it.

If you're not sure the recipient can open WebP, send JPEG.

Transparency and animation

JPEG has neither, so this is a clear win for WebP if you need either feature. One caveat for Toolstik users: the Image Converter fills transparent areas with white when it writes WebP or JPG. If you need a transparent WebP, use an encoder that supports alpha, such as Squoosh. Otherwise keep the image as PNG. Our four-format guide, JPG vs PNG vs WebP vs AVIF, covers when PNG and AVIF make more sense.

Decision guide

Choose WebP when:

• The image is served on a website or web app you control.
• Page speed matters, for example hero images, product grids, or long articles with many photos.
• You have the high-quality originals to convert from.

Choose JPEG when:

• The file is going to email, a client, a printer, or an upload form.
• You're archiving photos and want maximum long-term compatibility.
• Your CMS or CDN already creates WebP versions from uploaded JPEGs. In that case, upload a good JPEG and let it handle conversion.

Keep both when:

• Your site serves WebP to modern browsers and needs a JPEG fallback through an HTML picture element. Most audiences no longer need this, but some still do.

A practical workflow

1. Start from the best original. Avoid converting from a copy that has already been compressed.
2. Resize to the display size with the Image Resizer. For example, 4032×3024 at width 1600 becomes 1600×1200.
3. Convert to WebP with the Image Converter at 80-85% quality. The resizer outputs JPG or PNG, so convert after resizing, not before.
4. Check the result. If your browser can't encode WebP, the converter falls back to JPG, so confirm the downloaded file ends in .webp.
5. Need a JPEG copy too? Run the resized JPEGs through the Image Compressor, which keeps JPEGs as JPEG and never returns a larger file.

For every setting and troubleshooting tip, see our step-by-step guide on how to convert images to WebP.

Common mistakes

• Re-encoding the same image repeatedly. Each lossy save discards more data. Keep a master copy.
• Assuming a fixed saving. "WebP is always X% smaller" isn't true for every image. Measure.
• Converting tiny icons. For very small images, format overhead matters and the saving can be negligible. An SVG or PNG may be better.
• Sending WebP to people. It works on the web, but it's still awkward as an attachment.

Privacy

Every Toolstik image tool runs in your browser, so you can test WebP and JPEG versions of private or client images without uploading them. For the full toolkit, see the best free image tools.