If you are deciding whether you should use WebP images on your website, the answer for nearly every site owner is an immediate yes. Switching from JPEG and PNG to WebP typically cuts file sizes by 25% to 50% without visible quality loss, which directly accelerates page load speeds and improves Core Web Vitals. You should keep your original JPEG and PNG files stored safely as high-resolution editing masters, but deliver WebP to your site visitors.
| Feature | WebP | JPG / JPEG | PNG |
|---|---|---|---|
| Average File Size | Smallest (typically 25–50% lighter than JPG) | Standard baseline for photos | Heavy (often 2x to 5x larger than WebP) |
| Compression Type | Lossy and lossless modes | Lossy only | Lossless only |
| Transparency Support | Yes (lossy and lossless alpha) | No | Yes (lossless alpha) |
| Animation Support | Yes | No | No (APNG exists, but limited) |
| Browser Compatibility | 97%+ of modern browsers | Universal (100%) | Universal (100%) |
| Best Use Case | Web hero banners, thumbnails, ecommerce products | Offline storage, legacy systems, print files | Editing masters, vector exports needing exact pixels |
File Size Reduction and Core Web Vitals
Image weight makes up the bulk of the average web page payload. When a desktop or mobile browser downloads a 450 KB JPEG banner, it delays your Largest Contentful Paint (LCP), a metric Google uses to gauge user experience and page speed. Converting that identical image to WebP brings the file down to roughly 220 KB to 270 KB with no discernible difference on standard displays.
The compression efficiency of WebP comes from predictive coding. The format uses neighboring pixel blocks to predict values within an image and compresses only the difference. Photos containing rich gradients, shadows, and complex organic textures see the highest efficiency gains. You can test your own assets in seconds using the AtomnyX JPG to WebP converter to compare the exact before-and-after file weights directly in your browser.
Browser Support Across Modern Devices
In the past, web developers hesitated to adopt WebP because Apple held off support in Safari. That limitation is long gone. WebP works out of the box in Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, and Apple Safari 14 and newer on both iOS and macOS.
Global browser support for WebP exceeded 97% back in 2025. Unless a significant portion of your audience runs Internet Explorer 11 on legacy enterprise machines or uses an un-updated iPhone from 2019, your visitors will load WebP files without issue. If you must support legacy clients, use the standard HTML <picture> element to serve WebP first and fallback to JPEG automatically:
<picture>
<source srcset="banner.webp" type="image/webp">
<img src="banner.jpg" alt="Product Showcase">
</picture>
Handling Transparency: WebP vs PNG
Until WebP gained broad adoption, PNG was the default choice whenever a graphic required a transparent background, such as a cut-out product shot, logo, or icon badge. The downside of PNG is that its compression is strictly lossless, creating bulky files that drag down mobile page performance.
WebP solves this problem by supporting lossy transparency. It compresses color data aggressively while retaining a clean, sharp alpha channel for the transparent background. A transparent 1200x800 product graphic that weighs 850 KB as a 24-bit PNG can shrink to under 150 KB in WebP. For an in-depth breakdown of when lossless PNG still matters, review our guide on WebP vs PNG.
Next-Gen Alternatives: Is AVIF Replacing WebP?
AVIF is another modern format gaining traction among developers looking for maximum data reduction. Derived from the AV1 video codec, AVIF can deliver files that are 10% to 20% smaller than WebP in specific high-compression scenarios.
However, WebP remains the practical default for everyday websites. AVIF takes noticeably more CPU resources to encode and decode, which can cause frame stutter during fast scrolling on budget mobile hardware. WebP hits the sweet spot between rapid encoding speed, light decoding overhead, and wide platform support. For a full technical comparison, read our side-by-side analysis of AVIF vs WebP.
How CMS Platforms and Shopify Handle WebP
Most content management systems now treat WebP as a first-class citizen. WordPress added native WebP upload and management capabilities starting with version 5.8, meaning you can drop .webp files directly into your media library like any standard JPEG.
If you run an e-commerce storefront, you might ask: does Shopify support WebP images? Yes. Shopify accepts WebP uploads directly through its admin panel. Even better, Shopify's content delivery network (CDN) automatically converts your original high-resolution JPEGs and PNGs into WebP on the fly whenever a visitor's browser supports it. If you prefer to format and crop your store assets before uploading to avoid automated artifacts, you can prepare them using a dedicated image converter for Shopify.
When to Choose WebP Over Other Formats
While WebP is the right delivery format for the public web, it is not a complete replacement for every phase of digital media creation. Here is how to decide across common website scenarios:
- Choose WebP for live website assets: Use it for e-commerce catalog photos, hero banners, blog article illustrations, and thumbnails. Any image sent over an HTTP connection benefits from the smaller footprint.
- Choose WebP for animated UI elements: WebP animations are dramatically lighter than legacy GIFs, preserving full 24-bit color instead of the restrictive 256-color palette of the GIF specification.
- Stick to PNG for vector-style masters: If you are creating high-detail vector exports, screenshots with sharp text, or assets you plan to re-edit repeatedly, save the original master as a PNG to prevent generation loss.
- Stick to JPG for offline distribution: If you allow website visitors to download files meant for print, local photo editing in older desktop programs, or direct import into desktop office software, provide a standard JPEG file.
When you are ready to update your website images, process them through the in-browser JPG to WebP converter for zero-upload conversions with instant quality checks. If you have an entire gallery or product folder to convert at once, run them through the Bulk Image Compressor to save time.
Frequently Asked Questions
Does Shopify support WebP images?
Yes, Shopify supports WebP images completely. You can upload .webp files directly to your Shopify files and product catalogs. In addition, Shopify's image serving system automatically transforms standard JPEG and PNG uploads into WebP format when delivering them to compatible web browsers.
Is JPG to WebP conversion lossless?
No, WebP uses lossy compression by default, similar to JPEG. While WebP does offer a separate lossless mode, converting an existing JPEG to lossless WebP provides no quality benefit because the JPEG was already compressed. Setting your conversion quality around 85 creates a WebP file that is visually indistinguishable from the source JPEG while significantly reducing total file size.
How much smaller will my WebP file be compared to JPG?
A WebP image is typically 25% to 50% smaller than an equivalent JPEG at matched visual fidelity. Complex photographic images with fine textures and diverse color palettes yield the greatest storage savings, whereas images with large blocks of flat color show smaller, but still meaningful, reductions.
Can I convert JPG to WebP in bulk?
Single-image converters allow you to preview compression artifacts and monitor exact file size savings on individual hero images. When you need to process dozens of product shots or blog graphics simultaneously, use a batch processing tool like the Bulk Image Compressor to handle multiple files in a single pass.
Will switching to WebP improve my search rankings?
Converting to WebP does not give an automatic search ranking boost solely because of the file extension. However, it noticeably reduces page weight, speeds up load times, and improves your Largest Contentful Paint score. Because Google includes Core Web Vitals and overall page speed as ranking signals, smaller image files provide a direct technical SEO benefit.