WebP vs JPG: When to Use Each Format in 2025

WebP or JPG? Here's the short answer: use WebP for website images, JPG for everything else: social media uploads, email attachments, and files you share with people who might open them outside a browser.

That's the 80% rule. The other 20% depends on your workflow, and that's what this guide covers.

What WebP Actually Is

WebP is an image format developed by Google and released in 2010. It was designed from the ground up to replace both JPEG and PNG on the web by combining their best properties into one format:

• Lossy compression (like JPG) for photographs
• Lossless compression (like PNG) for graphics and text
• Alpha channel transparency (unlike JPG, which has none)
• Animation support (like GIF, but far more efficient)

Technically, WebP is based on the VP8 video codec's intra-frame compression. That's why it achieves such strong compression ratios on photographic content: it borrows techniques from video encoding that JPEG's DCT-based algorithm doesn't use.

The key difference from JPG: WebP can do everything JPG can do, plus lossless and transparency. JPG cannot do lossless. JPG cannot do transparency. Once you understand that, the format decision becomes much clearer.

Compression Numbers: How Much Smaller Is WebP?

Google's own benchmarks show WebP is 25–34% smaller than JPEG at equivalent visual quality. In practice, the range depends on image content, but the numbers hold up well.

Here's what that means in real terms:

• A 2 MB hero image in JPG at quality 85 → converted to WebP at quality 80 = typically 1.3–1.5 MB. You save 500–700 KB on every single page load.
• A 500 KB product photo in JPG → WebP equivalent ≈ 330–375 KB
• A 150 KB thumbnail in JPG → WebP equivalent ≈ 100–115 KB

The savings multiply fast. A page with 8 images that each save 200 KB is saving 1.6 MB per visit.

Why Does WebP Compress Better?

JPEG divides an image into 8×8 pixel blocks and compresses each block independently. Block boundaries can produce visible artifacts, the "blocky" look at low quality settings. WebP uses larger, variable-size blocks and more sophisticated prediction methods, which means less redundant data stored in the file without the same artifact pattern.

Browser Support in 2025

WebP is effectively universal in 2025. Support sits at 97%+ across all active browsers:

Internet Explorer is gone. The last meaningful holdout, Safari on older iOS, crossed the threshold five years ago. If you're still serving JPG "for compatibility," you're leaving performance on the table for no reason on modern infrastructure.

The only real browser caveat: devices running iOS 13 or older won't render WebP. If your analytics show meaningful traffic from that segment, the <picture> fallback pattern (covered below) handles it cleanly.

When JPG Still Wins

For all of WebP's advantages, there are real scenarios where JPG is the better choice:

Email Attachments

Most desktop email clients, Outlook in particular, don't render WebP inline. The image shows as a broken placeholder or a generic attachment icon. If you're sending images in email, stick with JPG.

Social Media Uploads

Instagram, Facebook, X (Twitter), Pinterest, and LinkedIn all re-compress uploaded images on their servers anyway. You upload a WebP file, they convert it to their own JPEG derivative at their own quality settings. The format you upload makes almost no difference to the end result. Since JPG is more universally compatible and avoids any potential upload-side edge cases, it's simpler to just use JPG for social.

Universal File Sharing

If you're handing a file to someone who will open it in an older version of Photoshop, Preview on an old Mac, or Windows Photo Viewer on Windows 7, WebP support is not guaranteed. For files that need to open on anything, JPG is safer.

EXIF Data Workflows

Some WebP encoders strip or alter EXIF metadata: GPS coordinates, camera model, shooting settings. If EXIF preservation matters for your workflow (photography archival, geotagging, legal documentation), verify your encoder's behaviour or stay on JPG or TIFF.

When WebP Wins

Website and App Images

This is the primary use case WebP was built for. Any image that loads via an <img> tag or CSS background-image in a modern browser should be WebP. The file size savings compound across every page load, every visitor.

Core Web Vitals and LCP

Google's Core Web Vitals framework uses Largest Contentful Paint (LCP) as a key ranking signal. LCP measures how quickly the largest visible element (usually a hero image) loads. Serving that image as WebP instead of JPG can shave hundreds of milliseconds off LCP time, which directly affects search ranking.

A 2 MB hero image takes roughly 2 seconds to load on a 10 Mbps connection. The same image as WebP at 1.4 MB loads in 1.4 seconds, a 0.6-second improvement on a single asset. Multiply that across an entire site and the effect on Core Web Vitals scores is significant.

Images with Transparency

JPG cannot store transparency at all. Transparent areas are filled with a background colour, usually white. PNG handles transparency but files are large. WebP handles transparency (alpha channel) with file sizes that are typically 26% smaller than equivalent PNGs.

If you have product images you want on a transparent background, or UI elements with soft shadows and alpha edges, WebP gives you smaller files than PNG with better compression than JPG at any quality.

Animation

Animated WebP files are dramatically smaller than GIF and comparable to or better than MP4 for short loops under a few seconds. If you're serving short animated content on a web page, WebP is worth benchmarking.

How to Convert JPG to WebP

The fastest way is OmegaPix's PNG to WebP converter, which handles JPG inputs too, despite the name. Drop your file in, set quality (80 is a good default for photos), and download. All processing runs directly in your browser. Your images are never uploaded to a server.

For bulk compression and quality comparison, the Image Compressor and JPG Compressor let you fine-tune settings and preview output before downloading. If you want to go further with next-gen formats, the AVIF Converter is worth benchmarking alongside WebP. AVIF is generally 10–15% smaller than WebP but has slower encoding and slightly lower browser support.

Recommended quality settings for WebP:

• Photographs: quality 75–85 (sweet spot between size and sharpness)
• Graphics and illustrations: lossless, or quality 90+
• Thumbnails: quality 70–75 (at small sizes, quality differences are harder to see)

Serving WebP with a JPG Fallback

If you need to support very old browsers or can't predict the rendering environment, the HTML <picture> element handles fallback without JavaScript:

<picture>
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description">
</picture>

Browsers that support WebP load image.webp. Browsers that don't fall back to image.jpg. The <img> tag is always present and handles alt text, which matters for accessibility and SEO crawlers.

You can extend this pattern for multiple formats:

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description">
</picture>

Browsers try each source in order, using the first format they support. This serves AVIF to Chrome and Firefox, WebP to Safari, and JPG to everything else, all with a single block of HTML.

In practice, if you're building a new site today and don't need to support iOS 13 or older, you can serve WebP directly via <img src> without the <picture> wrapper. At 97%+ browser support, the fallback is optional rather than essential for most audiences.

FAQ

Is WebP better than JPG?

For web use: yes, unambiguously. WebP produces files 25–35% smaller at the same visual quality, supports transparency, and has near-universal browser support. For everything outside the browser (email, social media, printing, archival) JPG remains more practical due to its universal compatibility.

Will WebP replace JPG?

On the web, it largely already has. The more interesting question is whether AVIF will eventually replace WebP: it offers another 10–20% compression improvement, and browser support is maturing. In five years, AVIF will likely be the dominant web format, while JPG persists as the universal compatibility fallback.

Can I use WebP on Instagram?

Instagram accepts WebP uploads, but re-compresses everything to its own format anyway. The upload format barely matters to the final result. JPG is simpler for social media workflows and avoids any upload-side edge cases.

How much smaller is WebP vs JPG file size?

Google's benchmarks: 25–34% smaller at equivalent quality. In practice with typical photography: 25–35% savings. The exact number depends on image content: photos with fine detail and texture compress more aggressively than smooth, flat-toned images.

Does WebP support transparency?

Yes. WebP supports full alpha channel transparency, unlike JPG (which has no transparency). WebP transparent images are typically 26% smaller than equivalent PNGs, which makes it the best format for transparent images on the web.

What quality setting should I use for WebP?

80 is a safe default for photographs: it produces files roughly equivalent in perceived quality to JPG at 85, while being about 30% smaller. For images with text or sharp geometric edges, use 85–90. For thumbnails, 70–75 works well.

Is WebP lossless or lossy?

Both. WebP supports both lossy and lossless compression in the same format. Lossy WebP is best for photographs. Lossless WebP is appropriate for graphics, screenshots, and images where pixel-perfect accuracy matters. This dual-mode flexibility is one of WebP's core advantages over JPG (lossy only) and PNG (lossless only).

Can older versions of Photoshop open WebP files?

Adobe added native WebP support in Photoshop 23.2 (released February 2022). Older versions require a free plugin. If your team is on older Creative Cloud versions, verify WebP support before switching your asset pipeline.