WebP Format Explained: Why It Is the Best Image Format for the Web

WebP format is Google’s answer to a simple problem: images on the web are too heavy. A WebP file is usually 25 to 35 percent smaller than the same photo as JPG, and smaller than PNG for graphics, with no visible drop in quality. This article explains what the WebP format is, why Google built it, how it compares to JPG and PNG, when to use it, and how to check, compress, and edit WebP files. It goes deeper on one format from our wider guide to image file formats.

What the WebP format is

WebP is an image format Google released in 2010 and has refined ever since. It is designed for one job: showing images on web pages using as few bytes as possible. The file extension is .webp.

What makes WebP unusual is range. JPG handles photographs but cannot do transparency. PNG handles graphics and transparency but produces large files. GIF handles animation but only 256 colours. WebP does all of it: photographs, graphics, transparency, and animation, in a single format. That is why it has become the default recommendation for web images.

Why Google created WebP

Google measures the web for a living, and one number kept growing: page weight. Images are the largest part of most pages, often more than half the total bytes a visitor downloads. Heavier pages load slower, and slower pages lose visitors and rank lower in search.

JPG and PNG were designed in the early 1990s. They are reliable, but their compression is old. Google built WebP to compress the same image far harder while keeping it looking the same, so a page could carry the same pictures at a fraction of the download cost. For a business, that is faster pages, lower bandwidth bills, and a small but real ranking benefit, since page speed is part of how Google ranks results.

How much smaller WebP files are

The savings are large enough to notice on a real page. Picture an online store with a product gallery of twelve photos, each one an 800 KB JPG. That gallery is 9.6 MB. Re-saved as WebP at the same visible quality, the same twelve images land near 3 MB. The page that took eight seconds on a phone now takes under three.

As a rough guide, expect a WebP file to be 25 to 35 percent smaller than the equivalent JPG, and around 26 percent smaller than a PNG for the same graphic. The exact figure depends on the image, but WebP wins almost every time.

WebP does both lossy and lossless

Most formats pick a side. JPG is always lossy, it throws away detail to shrink the file. PNG is always lossless, it keeps every pixel and stays larger. WebP offers both modes in one format.

Lossy WebP is the choice for photographs, where discarding a little invisible detail is a fair trade for a much smaller file. Lossless WebP is the choice for logos, screenshots, and flat-colour graphics, where sharp edges must stay crisp. You pick the mode that matches the image, and in both cases the result is smaller than the older format it replaces.

Transparency: WebP vs PNG

Transparency is the see-through background that lets a logo sit cleanly on any colour. For years PNG was the only practical way to get it. WebP supports transparency too, and it does so at a much smaller size.

A transparent logo that is 180 KB as a PNG is often near 60 KB as a WebP, with the edges just as clean. If a site uses transparent graphics in its header, footer, and product images, switching them to WebP trims real weight from every page without any visible change.

Animation: WebP vs GIF

WebP can also hold short animations, the same looping clips GIF is known for. The difference is quality and size. GIF is locked to 256 colours, so a photographic animation looks blotchy, and GIF files are large. Animated WebP keeps full colour and compresses far better.

A short product animation that is 4 MB as a GIF can drop below 1 MB as an animated WebP, and it will look better doing it. GIF still has a place where a platform specifically expects it, but for animation on your own site, WebP is the lighter choice.

Browser support: is WebP safe to use

This used to be the reason people hesitated, and it no longer applies. Every major browser, Chrome, Firefox, Safari, and Edge, has supported WebP since 2020. In practice that covers almost every visitor who will reach your site today.

You can use WebP as your default web image format with confidence. The old advice to keep a JPG fallback is now only relevant if you must support browsers that are many years out of date.

When not to use WebP

WebP is the right default for the web, but it is not the right format everywhere. Three cases call for something else.

For images that will be printed or sent to a print shop, stick with the format the printer asks for, usually a high-quality JPG or TIFF. For a logo that must scale to any size, from a favicon to a banner, a vector SVG stays sharp where any pixel format, WebP included, would blur. And for a file you are handing to someone on much older software, a plain JPG or PNG removes any risk that their program cannot open it.

How to check if a file is WebP

A file named image.jpg is not always a JPG. Files get renamed, downloaded, and re-saved, and the extension can end up describing something the data is not. When an upload fails or an editor rejects a file, a format mismatch is a common cause.

The reliable way to know is to read the file data itself. The WebP format checker confirms in one step whether a file really is WebP. For a closer look at a WebP file, its dimensions, whether it uses lossy or lossless mode, and whether it has transparency, the WebP analyzer reports the details.

How to compress and optimise WebP

WebP is already efficient, but a WebP file straight out of an export is rarely as small as it could be. Two tools tighten it further.

The WebP compressor shrinks a WebP file while keeping it usable, which is the quick option when you just need a lighter file. The change WebP quality tool gives you precise control, letting you set the exact quality level and watch the size change, so you can find the point where the file is small but still looks right. If you are pulling a WebP out of code or a data string, the Base64 to WebP converter turns an encoded string back into a real file.

How to edit a WebP file

You do not need to convert a WebP back to another format just to make a small edit. Several tools work on WebP files directly. The blur WebP tool softens a file or part of it, the change WebP color tool adjusts its colour, and the change WebP opacity tool makes the whole image more or less transparent.

All of these run in the browser. The file is processed on your own device, nothing is uploaded to a server, and there is no sign-up. If you have a BMP that needs to become a WebP, the BMP to WebP converter handles that, and the full set lives in the WebP tools category.

Frequently asked questions

Is WebP better than JPG?

For the web, yes. A WebP file is usually 25 to 35 percent smaller than the same JPG at the same visible quality, and it can also do transparency and animation, which JPG cannot. For print or for very old software, a JPG is still the safer choice.

Do all browsers support WebP?

Every major browser, Chrome, Firefox, Safari, and Edge, has supported WebP since 2020. It is safe to use as a default web image format today.

Does WebP lose quality?

It depends on the mode. Lossy WebP discards a small amount of detail to save space, like JPG. Lossless WebP keeps every pixel, like PNG. You choose the mode that suits the image.

Can WebP have a transparent background?

Yes. WebP supports transparency, and a transparent WebP is usually much smaller than the same image as a transparent PNG.

How do I know if a file is really WebP?

Do not trust the file extension, since it can be renamed. Use a checker that reads the file data, such as the WebP format checker linked above.