A complete side-by-side comparison of WebP and JPG — file size, quality, browser support, transparency, and when to use each format.
WebP produces files 25–35% smaller than JPG at equal visual quality. It also supports transparency (which JPG does not) and lossless compression. Browser support now exceeds 97% of global users, including all modern versions of Chrome, Firefox, Safari, and Edge. The only remaining reason to prefer JPG is compatibility with old software — email clients, legacy CMS platforms, or desktop applications that don't yet handle WebP. For web publishing, WebP is the correct choice.
| Feature | WebP | JPG / JPEG |
|---|---|---|
| Compression type | Lossy and lossless modes | Lossy only |
| File size (photos) | 25–35% smaller than JPG | Baseline — larger than WebP |
| Transparency (alpha) | Fully supported | Not supported |
| Lossless mode | Yes — lossless WebP available | No — always lossy |
| Animation support | Yes — animated WebP | Not supported |
| Browser support (2026) | 97%+ — all modern browsers | Universal — 100% |
| Desktop software support | Good — most modern apps | Universal |
| Email client support | Limited — Gmail yes, Outlook no | Universal |
| Compression artifacts | Less visible at same file size | Blocky artifacts at low quality |
| Re-editing quality | Degrades with each lossy save | Degrades with each save |
| Developed by | Google (2010) | Joint Photographic Experts Group (1992) |
| Best for | All web images — photos, graphics, icons | Photos where compatibility is critical |
Here's what typical file size savings look like when converting from JPG to WebP for different image types at equivalent visual quality:
On a page with 10 images, switching from JPG to WebP typically saves 1–2 MB of data per page load — a meaningful improvement for Core Web Vitals and mobile users on slow connections.
WebP was developed by Google in 2010 and is based on the VP8 video codec's intra-frame compression. For lossy mode, WebP uses a prediction coding technique — instead of encoding each 8×8 block independently (as JPG does), WebP predicts what the block should look like based on neighboring pixels and only encodes the difference. This approach is significantly more efficient for photographic content, explaining why WebP files are consistently 25–35% smaller than JPG at the same visual quality level.
For lossless mode, WebP uses a completely different algorithm based on backward reference coding and a 2D context model, producing files that are about 26% smaller than equivalent PNGs while preserving every pixel perfectly. This makes lossless WebP a compelling option for screenshots, logos, and UI assets — beating both PNG and high-quality JPG simultaneously.
WebP also supports alpha transparency in both lossy and lossless modes. A semi-transparent image saved as WebP will be roughly 25% smaller than an equivalent PNG, with no quality difference for the opaque pixels and identical alpha channel behavior.
JPG was standardized in 1992 and has had over 30 years to embed itself in every piece of software, hardware, and workflow imaginable. Digital cameras output JPG. Email clients render JPG. Photo editing software from 1998 can open JPG. Every operating system, every browser, every social network, and virtually every application on earth handles JPG without any configuration.
This ubiquity is JPG's only remaining advantage over WebP. In terms of file efficiency and capability, WebP is superior in every measurable way. But compatibility inertia means JPG will remain common for years — particularly outside the browser, where WebP adoption is slower.
For web publishing specifically, JPG's compatibility advantage has already collapsed. Every browser used by more than 1% of global web traffic supports WebP natively. If you're serving images on the web, there is no valid reason to prefer JPG over WebP for new content.
| Browser | WebP Support Since | Status |
|---|---|---|
| Chrome | Chrome 23 (2012) | Full support |
| Firefox | Firefox 65 (2019) | Full support |
| Safari | Safari 14 / iOS 14 (2020) | Full support |
| Edge | Edge 18 (2018) | Full support |
| Opera | Opera 12 (2012) | Full support |
| Samsung Internet | Version 4 (2016) | Full support |
| Internet Explorer | Never supported | Discontinued — irrelevant |
| iOS < 14 | Not supported | <1% of users in 2026 |
Global WebP support among active web users exceeds 97% in 2026. If you need to serve the remaining sub-3% (primarily very old iOS devices), use the HTML <picture> element as shown below.
Browsers that support WebP will use the <source> tag. All others automatically fall back to the JPG. This approach gives you WebP's size savings for the vast majority of users with zero quality penalty for anyone else.
Google's Core Web Vitals — specifically Largest Contentful Paint (LCP) — directly measure how fast your page's main image loads. LCP is a confirmed ranking signal. Switching hero images and product photos from JPG to WebP typically reduces their file sizes by 30%, directly improving LCP times.
Google PageSpeed Insights and Lighthouse both explicitly recommend WebP as a modern image format and will flag JPG images as an optimization opportunity. The recommendation "Serve images in next-gen formats" specifically refers to WebP (and AVIF). Addressing this one recommendation alone can add 10–30 points to a PageSpeed score on image-heavy pages.
The SEO-optimal image stack for 2026:
<picture> fallback for legacy browsersConverting existing JPG images to WebP is fast and straightforward. IMGVO's converter runs entirely in your browser — no uploads, no servers, no file size limits. For most photographs, a WebP quality setting of 80–85 produces the best balance of file size and visual quality.
When choosing a quality setting:
WebP wins on every technical dimension — smaller files, better quality at the same size, transparency support, lossless mode, and animation support. For web publishing in 2026, WebP should be your default image format for photographs and graphics alike.
JPG remains relevant only for compatibility — when you need your images to open in email clients, legacy software, or contexts outside the browser. In those cases, keep the JPG. For everything web-facing, convert to WebP and watch your page load times improve.
If you're starting fresh, the question isn't really "WebP or JPG?" — it's "WebP or AVIF?" AVIF compresses 20–30% better than WebP but has slightly lower software support. For most teams, WebP is the pragmatic choice: better than JPG, nearly universal, and supported by every modern web tool and CDN.
Yes, in most cases WebP produces smaller files than JPG at equal or better visual quality. WebP files are typically 25–35% smaller than equivalent JPG files. WebP also supports transparency and lossless compression, which JPG does not. The only reason to still prefer JPG is for maximum compatibility with very old software or email clients that don't support WebP.
Converting JPG to WebP using lossless WebP mode will preserve the JPG's current pixel data exactly. However, it cannot restore detail already lost during original JPG compression. For best results, convert at WebP quality 80–85 for photos — this produces a smaller file than the original JPG while looking visually identical at normal viewing sizes.
Yes. As of 2026, WebP is supported by all major browsers including Chrome, Firefox, Safari (since 2020), Edge, and Opera. Browser support covers over 97% of global web users. The only edge cases are very old iOS devices (pre-iOS 14) and Internet Explorer, which is discontinued. Use a <picture> element with a JPG fallback if you need to support these rare cases.
Yes. WebP supports full alpha transparency, just like PNG. This gives it a major advantage over JPG, which has no transparency support at all. A WebP with transparency is typically 25–35% smaller than an equivalent PNG, making WebP an excellent choice for icons, logos, and UI graphics on the web.
Use WebP for your website in 2026. It delivers smaller file sizes than JPG — improving page load speed and Core Web Vitals scores — while also supporting transparency. You can use the HTML <picture> element to serve WebP with a JPG fallback for any remaining incompatible browsers, though this is rarely necessary today.
Yes, often significantly. Google PageSpeed Insights specifically flags JPG images and recommends converting to WebP under "Serve images in next-gen formats." Converting hero images and product photos from JPG to WebP typically shaves 30–40% off those files' sizes, improving Largest Contentful Paint (LCP) — a direct Google ranking signal.
Partially. Gmail and Apple Mail support WebP, but Outlook (desktop) does not. Since email newsletters need to display correctly for all recipients, JPG remains the safer format for email images. Use WebP on the web and JPG in email until Outlook adds full WebP support.
Yes — AVIF (AV1 Image Format) compresses 20–30% better than WebP at equivalent quality. AVIF browser support is strong but not yet universal (around 90% of browsers as of 2026). For most teams, WebP is the pragmatic sweet spot: better than JPG, nearly universal browser support, and supported by all major CDNs, CMSes, and image processing tools. AVIF is worth considering for new projects where you can control the full stack.
Only if you use lossy mode (which is the default). At quality settings of 80–85, the visual difference from the original is invisible to most viewers at normal screen sizes. At quality 85, WebP files are still 25% smaller than equivalent JPG. If you need perfect pixel-for-pixel preservation, use WebP lossless mode — though lossless WebP files are larger than lossy WebP (but still smaller than PNG).