What Is WebP and Why It Makes Your Website Faster
If you have ever run a speed test on your site and seen the words "serve images in next-gen formats," that recommendation is almost always pointing you toward WebP. It is one of the easiest wins available for a faster website: swap your JPGs and PNGs for a format that looks the same but weighs noticeably less.
This guide explains what WebP actually is, why it compresses better than the formats it replaces, and how that translates into real speed gains and better search rankings. Everything you convert with Pixohub runs 100% in your browser, so your images never leave your device, and every tool is free with no signup.
What Is WebP?
WebP is an image format developed by Google and first released in 2010. It was designed specifically for the web, with a single goal: deliver the same visual quality as JPG and PNG at a smaller file size. Over the years it has matured from an experimental format into a default choice for performance-conscious websites.
What makes WebP unusually flexible is that it combines several capabilities that used to require different formats:
- Lossy compression for photographs, where a small, invisible loss of detail buys a big drop in file size (the job JPG traditionally did).
- Lossless compression for graphics, logos, and screenshots that need pixel-perfect accuracy (the job PNG did).
- Alpha transparency, so you get transparent backgrounds like PNG, but even in lossy mode.
- Animation, meaning it can replace bulky animated GIFs with far smaller files.
In other words, WebP is a single format that can stand in for JPG, PNG, and GIF depending on what you throw at it.
How WebP Compresses Better Than JPG and PNG
WebP's compression is built on technology borrowed from video encoding, specifically Google's VP8 codec for lossy images and VP8L for lossless. That heritage matters because video codecs are experts at predicting pixels.
Prediction and block transforms
Instead of encoding every pixel from scratch, WebP breaks an image into blocks and predicts each block's contents from the pixels around it. It then stores only the small difference between the prediction and the real values. Because neighboring pixels in a photo are usually similar, these differences are tiny and compress extremely well. Lossless WebP (VP8L) uses similar prediction plus dictionary-style techniques to shrink graphics without touching a single pixel value.
What that means in practice
In real-world use, WebP files typically land around 25-35% smaller than an equivalent JPG at comparable quality, and lossless WebP is often roughly 25% smaller than PNG. For a media-heavy page, that can mean shaving hundreds of kilobytes, sometimes megabytes, off the total download with no visible change. If you want to see the difference for yourself, you can convert an image to WebP and compare the file sizes side by side.
The Connection Between WebP and Website Speed
Images are usually the single largest contributor to page weight. On a typical website, they account for more transferred bytes than HTML, CSS, and JavaScript combined. Because WebP shrinks those bytes, it directly attacks the biggest slice of your load time.
Core Web Vitals and Largest Contentful Paint
Google measures user experience through Core Web Vitals, and the most image-sensitive metric is Largest Contentful Paint (LCP), the time it takes for the biggest visible element (often a hero image) to render. A smaller WebP hero downloads faster, so LCP improves. Since Core Web Vitals are a ranking signal, faster images can indirectly help your SEO.
Bounce rate, bandwidth, and cost
Speed is not only an SEO concern. Slow pages drive visitors away, and even a one-second delay measurably increases bounce rate, especially on mobile connections. Smaller images also mean less bandwidth served, which lowers your CDN and hosting bills and reduces data usage for people on limited mobile plans. The benefits compound across every visitor.
Browser Support for WebP in 2026
One of the old objections to WebP was browser support, but that concern is now firmly in the past. As of 2026, WebP is supported universally across every major browser:
- Google Chrome (native support since 2010).
- Firefox (since 2019).
- Microsoft Edge (fully supported).
- Safari on both macOS and iOS (since 2020).
That means well over 95% of global web traffic can display WebP today. For the tiny fraction of very old browsers, a simple fallback (covered below) keeps everyone covered.
How to Adopt WebP on Your Website
Moving to WebP is straightforward and does not require rebuilding your site. Here is a practical sequence to follow:
- Convert your existing images. Drop a JPG or PNG into the Image to WebP converter to get a WebP copy instantly, right in your browser.
- Convert in bulk for whole folders. If you have a media library to migrate, use bulk format convert to process many files at once instead of one at a time.
- Choose a sensible quality. For lossy WebP, a quality setting around 80 is the sweet spot, visually indistinguishable from the original for most photos while cutting size dramatically.
- Squeeze out any remaining weight. For maximum savings you can further compress the image after converting.
- Provide a fallback so no browser is left behind.
Serving WebP with a fallback
The HTML <picture> element lets modern browsers load WebP while older ones fall back to a JPG automatically. It looks like this:
<picture><source srcset='hero.webp' type='image/webp'><img src='hero.jpg' alt='Product hero'></picture>
The browser reads the sources top to bottom and uses the first one it understands. WebP-capable browsers grab the WebP file; anything else quietly loads the JPG in the <img> tag. You get the speed benefit with zero risk of broken images.
WebP vs AVIF: A Quick Note
You may also hear about AVIF, an even newer format that can compress slightly smaller than WebP. It is a strong option, but browser support and encoding tooling are less mature, and its gains over a well-tuned WebP are often modest. For most sites in 2026, WebP remains the pragmatic default: near-universal support, excellent compression, and dead-simple tooling. AVIF is worth adding as an extra <source> once WebP is already in place.
Converting WebP Back When You Need To
Sometimes you receive a WebP file but need a more traditional format, for example to open it in older software, attach it to an email, or hand it to a client. Converting back is just as easy as converting to WebP.
- Need transparency preserved? Use WebP to PNG to get a lossless copy with its alpha channel intact.
- Need a universally compatible photo? Use WebP to JPG for a smaller, everywhere-supported file.
Because these conversions also run entirely in your browser, your images stay private on your own device throughout the process.
Conclusion
WebP is a modern, web-first image format that delivers the same visual quality as JPG and PNG at a meaningfully smaller size, thanks to prediction-based compression borrowed from video codecs. Smaller images mean a lighter page, a faster Largest Contentful Paint, healthier Core Web Vitals, lower bounce rates, and reduced bandwidth costs, all of which help your rankings and your bottom line. With universal browser support in 2026 and a simple <picture> fallback for the rare exceptions, there is little reason not to adopt it. Convert your first image to WebP today and watch your page weight drop.