JPG vs WebP: Which Image Format Should You Use in 2025?

JPG and WebP are the two most common lossy image formats on the web today — but they serve different masters. JPG was designed in 1992 for maximum compatibility. WebP was engineered by Google in 2010 to do the same job with files that are 25–34% smaller. Knowing when to use each one can meaningfully improve your website's performance, Core Web Vitals scores, and user experience.

This guide gives you the full picture: a comprehensive comparison table, real file size numbers, transparency and animation support, browser and software compatibility, SEO impact, and a clear verdict on which format to use in which situation.

Quick Answer

For web delivery — WebP wins. It is smaller at the same quality level, supports transparency, supports animation, and is now supported by 97%+ of global browsers. Every image you publish on a website or app should ideally be WebP.

For universal compatibility — JPG is safer. Email attachments, print, legacy CMS platforms, older image editors, and raw camera archives all work better with JPG. If you need a photo to open on any device or application without question, JPG is the dependable choice.

What Is JPG?

JPG (also written JPEG, short for Joint Photographic Experts Group) has been the dominant photo format since 1992. It uses a lossy compression algorithm based on the Discrete Cosine Transform (DCT), which works by discarding fine colour detail that the human eye is least sensitive to — primarily in areas of subtle colour variation. The result is a dramatic reduction in file size with very little perceptible quality loss for photographic content.

JPG is the most universally compatible image format in existence. Every browser, every operating system, every printer, every email client, every image editor, and virtually every digital device released in the past thirty years can open and display a JPG file without any additional software. If you take a photo on a digital camera or smartphone, the output is almost certainly a JPG.

Its limitations are well understood: JPG cannot store transparency (alpha channel), cannot animate, and is lossy-only — there is no lossless JPG mode. Every time a JPG is saved, the re-encoding process introduces additional compression artefacts.

What Is WebP?

WebP is an image format developed by Google, released in 2010 as an open standard. Its compression algorithm is derived from the VP8 video codec — the same technology that powers WebM video. This lineage gives WebP a significant advantage over JPG: it achieves the same visual quality with substantially smaller file sizes.

Unlike JPG, WebP is multi-modal. It supports:

• Lossy compression — like JPG, suitable for photographs
• Lossless compression — like PNG, for graphics and screenshots with no quality loss
• Full alpha transparency — something JPG cannot do at all
• Animation — a capable, high-quality alternative to GIF

Google's own extensive testing shows that WebP in lossy mode produces files 25–34% smaller than JPG at equivalent visual quality. For lossless images, WebP is 26% smaller than PNG. This is not marginal — on an image-heavy page, it translates to hundreds of kilobytes of savings per page load.

Full Comparison Table

File Size Comparison — Real Numbers

The headline statistic — WebP is 25–34% smaller than JPG at the same quality — comes from Google's own benchmarks across thousands of test images. Here is what that looks like in practice for a 4000×3000 pixel photograph:

What does that mean in the real world? A typical web page with a hero image, 8 product photos, and a few thumbnails might carry 1 MB of JPG image data. Switch all of those to WebP and the image payload drops to roughly 650 KB — a saving of 350 KB on every page load. On a 4G mobile connection, that is a meaningful improvement in perceived load time. On slower connections or for users on metered data plans, it is the difference between staying and leaving.

For a site with 10,000 monthly visitors each loading that page, WebP saves approximately 3.5 GB of bandwidth per month — which also translates to lower CDN costs if you pay for egress.

Quality Comparison

File size is only half the story. At equivalent file sizes, WebP does not just match JPG quality — it exceeds it. The VP8-derived compression algorithm is better at preserving detail in:

• Smooth gradients — such as skies, backgrounds, and skin tones. JPG tends to introduce visible banding at lower quality settings; WebP maintains smoother transitions.
• Fine texture — fabric, hair, grass, and other high-frequency detail areas. WebP's larger block sizes and more advanced prediction modes handle these more gracefully.
• Colour accuracy — WebP supports up to 10-bit colour depth in some modes, versus JPG's 8-bit limit, allowing more subtle colour gradations.

For typical web use at quality 80–85, most viewers cannot distinguish a WebP from a JPG. But at lower quality settings — where you really push the compression — WebP is noticeably better. This means you can target a smaller file size with WebP and still achieve better perceptual quality than JPG.

Transparency Support

This is one of the starkest differences between the two formats: JPG has no transparency support whatsoever. Every pixel in a JPG is fully opaque. If you save an image with a transparent background as JPG, the transparency becomes white (or whatever background colour was set). You cannot layer a JPG over another image without a visible rectangular box surrounding it.

WebP, on the other hand, supports a full 8-bit alpha channel — the same transparency system used by PNG. This makes WebP uniquely versatile: it can replace both JPG (for opaque photographs) and PNG (for graphics with transparent backgrounds) with a single format, and produce smaller files than either one.

For web developers, this is significant. Instead of using PNG for logos, icons, and cutout product photos — and JPG for everything else — you can standardise on WebP for your entire image pipeline and achieve the smallest possible file sizes across all asset types.

Animation Support

JPG cannot animate at all. A JPG is always a single static frame.

WebP supports multi-frame animation, making it a capable replacement for the aging GIF format. Animated WebP files offer several advantages over GIF:

• True 24-bit colour (GIF is limited to 256 colours)
• Full alpha transparency per frame
• File sizes typically 64% smaller than the equivalent GIF for the same animation
• Lossy or lossless compression per frame

For animated UI elements, reaction GIFs, and short product demos, WebP animation is substantially better than GIF in every measurable dimension. The one caveat: not all applications that support static WebP also support animated WebP — support is broad in browsers but patchier in messaging apps and social platforms.

Browser Support in 2025

WebP's biggest weakness at launch was browser support. That era is long over. As of 2025, WebP is supported in:

• Chrome — since version 23 (October 2012)
• Firefox — since version 65 (January 2019)
• Safari — since version 14 (September 2020, macOS Big Sur / iOS 14)
• Edge — since version 18 (2018); Chromium Edge since 2019
• Samsung Internet, Opera, UC Browser, Android Browser — all supported

Global browser support stands above 97% as of 2025. The remaining 3% is almost entirely IE11 (in enterprise environments) and Safari versions older than 14 (iOS 13 and earlier, macOS Catalina and earlier). For virtually all consumer-facing websites and apps, you can serve WebP to all visitors today without any fallback. JPG remains at 100%, but the practical gap is negligible for most use cases.

If you need a fallback for legacy browsers, the HTML <picture> element handles it cleanly:

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

Frameworks like Next.js, Nuxt, and Astro do this automatically when you use their image components. Most modern CDNs (Cloudflare, Fastly, Imgix) can also serve WebP to supporting browsers and fall back to JPG automatically based on the Accept request header.

Software Support

JPG opens in absolutely everything — every app released in the past 30 years handles it without question. WebP's software support has improved dramatically since 2020 but still has gaps in some environments:

• Adobe Photoshop — native WebP support added in version 23.2 (February 2022). Earlier versions require the WebPShop plugin.
• GIMP — full WebP support since version 2.10.
• Windows Photos — WebP supported with a free codec from the Microsoft Store (installed automatically on Windows 10/11).
• macOS Preview — WebP supported since macOS Big Sur (2020).
• Affinity Photo, Lightroom (export only), Figma — all support WebP.
• Older Photoshop (pre-2022), Lightroom import — no native WebP support without plugins.
• Email clients — Gmail renders WebP inline. Outlook on Windows does not. Apple Mail on iOS supports it. For emails sent to unknown recipients, JPG is the safe choice.

For web production workflows, the software landscape is essentially solved — all modern design and development tools handle WebP. The gaps that remain are in print production, legacy enterprise tools, and direct email delivery.

SEO and Core Web Vitals

Image format directly affects page load performance, which in turn affects your search rankings. Here is the specific mechanism:

• Largest Contentful Paint (LCP) — the most image-sensitive Core Web Vitals metric. LCP measures how long it takes the largest visible element (often a hero image or product photo) to appear on screen. A WebP hero image that loads in 1.2 seconds instead of a JPG that takes 1.8 seconds moves you from "needs improvement" to "good" on LCP — a direct ranking signal.
• Total page weight — smaller images reduce time-to-interactive and First Input Delay on lower-end devices.
• Google PageSpeed Insights — this tool explicitly flags JPG images and recommends WebP. The recommendation appears in the "Serve images in next-gen formats" audit. Addressing it removes a red warning from your PageSpeed report and directly improves your performance score.
• Bandwidth and bounce rate — faster pages have lower bounce rates, and bounce rate correlates with ranking.

Google has publicly stated that using modern image formats like WebP can improve PageSpeed scores by 10–30 points on image-heavy pages. Indirectly, that improvement flows through to better organic search visibility over time.

When to Use JPG

When to Use WebP

The Verdict — Which Should You Use?

The answer depends on where the image is going, not what it contains.

Use WebP as your default for anything published on the web. The browser support is broad enough that serving WebP without a fallback is safe for virtually all consumer-facing websites in 2025. The file size savings are consistent and meaningful — 25–34% per image — and the quality is equal to or better than JPG. For a site with significant image content, the cumulative effect on page speed and Core Web Vitals is substantial.

Keep JPG as your archive and sharing format. Raw camera output, photos sent by email, images destined for print, and files you need to open on arbitrary devices or software should remain as JPG. The 100% compatibility guarantee is irreplaceable for these use cases, and the 25–34% file size penalty is rarely a concern when the file is not being served over HTTP to a browser.

The practical workflow for most teams: shoot and archive in JPG (or raw), then convert to WebP as part of your web publishing pipeline. Tools like Imagemin, Squoosh, and cloud-based image optimisation services like Cloudinary and Imgix can automate this conversion at build time or on upload, so you never have to manually convert images for the web.

How to Convert JPG to WebP

Converting JPG to WebP is straightforward, and you can do it entirely in your browser without any software installation or account creation.

1. Go to convertlo.pro/jpg-to-webp.html
2. Drag and drop your JPG files (or click to browse — batch conversion is supported)
3. Adjust the quality slider if needed (80 is a good default)
4. Click Convert and download your WebP files

The entire conversion happens locally in your browser using the browser's built-in Canvas API — your files are never uploaded to any server. This means there is no file size limit imposed by upload speed, no privacy concern about sending photos to a third-party server, and no waiting for a server queue.

For bulk conversion or integration into a build pipeline, tools like Imagemin with the imagemin-webp plugin, or the cwebp command-line tool from Google's libwebp package, are the standard options.

Frequently Asked Questions