What is WebP and Why Should You Convert Your Images?

What Exactly is WebP?

WebP is an image format created by Google and released in 2010. It was designed from the ground up to replace JPG and PNG on the web by delivering the same visual quality at a significantly smaller file size. The format supports both lossy and lossless compression, transparency (like PNG), and even animated images (like GIF) — all in a single format.

The technology behind WebP is based on the VP8 video codec, which Google acquired when it bought On2 Technologies. By applying video compression techniques to still images, WebP achieves compression ratios that older formats simply cannot match.

WebP vs JPG vs PNG: How Do They Compare?

Understanding when to use each format requires knowing what each one does best.

Feature	JPG	PNG	WebP
Compression type	Lossy	Lossless	Both
Transparency support	No	Yes	Yes
Animation support	No	No	Yes
File size (photos)	Medium	Large	Small
Browser support	Universal	Universal	95%+ modern
Best for	Photos	Graphics, logos	Everything

According to Google's own benchmarks, WebP lossy images are on average 25–34% smaller than comparable JPG images. WebP lossless images are 26% smaller than PNG. These are not marginal improvements — on an image-heavy website, this can translate to seconds of faster load time.

Why Does Image Format Matter for Your Website?

Page speed is one of the most important factors in user experience and search engine optimization. Studies consistently show that a one-second delay in page load time can reduce conversions by up to 7%. Images are typically the largest assets on any webpage — optimizing them is one of the highest-impact things you can do for performance.

Google's Core Web Vitals, which directly influence search rankings, include Largest Contentful Paint (LCP) — a metric that measures how fast the main image on a page loads. Using WebP instead of JPG or PNG can meaningfully improve your LCP score, which in turn can improve your position in search results.

Is WebP Supported by All Browsers?

WebP is now supported by all major modern browsers — Chrome, Firefox, Safari (since version 14, released in 2020), Edge, and Opera. As of 2024, WebP support covers over 95% of global web users. The days of worrying about browser compatibility for WebP are largely behind us.

For the small percentage of users on older browsers, a common technique is to serve WebP as the primary format and fall back to JPG using the HTML <picture> element. However, for most websites today, serving WebP directly is perfectly safe.

When Should You Keep Using JPG or PNG?

WebP is excellent for most use cases, but there are situations where JPG or PNG may still be the right choice:

• JPG remains useful when you need maximum compatibility with older software, print workflows, or systems that do not support WebP (like some email clients and certain CMS platforms).
• PNG is still preferred when you need lossless quality with transparency and the receiving system does not support WebP — for example, some design tools and document editors.
• Animated WebP is a great alternative to GIF, but not all platforms (like Twitter or some messaging apps) accept it, so GIF may still be needed for animated content in those contexts.

How to Convert Your Images to WebP for Free

You do not need to install any software to convert your images to WebP. The WorldMerch File Converter handles JPG, PNG, and WebP conversions entirely in your browser — no uploads, no accounts, no limits. Your images stay on your device at all times.

Converting is straightforward:

1. Open the File Converter tool
2. Drop your JPG or PNG image onto the converter
3. Select WebP as the output format
4. Adjust the quality slider if desired (85% is a good starting point)
5. Download your converted WebP image

The entire process takes seconds and produces a WebP file that is ready to use on your website, in your app, or anywhere else images are displayed.

Tips for Getting the Best Results When Converting to WebP

To get the most out of WebP conversion, keep these practical tips in mind:

• Start from the original, uncompressed source image. Converting an already-compressed JPG to WebP will preserve the existing compression artifacts. Always convert from the highest-quality version available.
• Use a quality setting between 80–90%. This range provides an excellent balance between file size and visual quality for most photographs and graphics. For text-heavy images or sharp graphics, use 90%+ or lossless mode.
• Test on multiple devices. Check that your converted WebP images display correctly on both desktop and mobile browsers before deploying them on a live website.
• Combine WebP with lazy loading. Using WebP alongside the loading="lazy" attribute on images further reduces initial page load time by deferring off-screen images until they are needed.

The Bottom Line

WebP is not a niche format or a future technology — it is the current best practice for web images. It delivers smaller files, supports transparency and animation, and is backed by near-universal browser support. For any website that cares about performance, user experience, or search rankings, adopting WebP is one of the simplest and highest-impact optimizations available.

The good news is that converting your existing image library to WebP requires no technical expertise and no paid software. Free browser-based tools make the process accessible to anyone, regardless of technical background.