What Is WebP and Should You Switch to It

October 17, 2026 • NOFYI Editorial Team

WebP is an image format designed for the web. It can store photographs and graphics at smaller file sizes than JPG or PNG in many common cases, while keeping a similar appearance. That smaller size can make pages load faster, use less mobile data, and feel more responsive. But WebP is not the right choice for every image or every workflow. This guide explains what WebP is, how it differs from JPG and PNG, how to switch safely, and when to leave an image as it is.

If you run a website, a blog, or an online store, images are often one of the largest parts of a page. A single unoptimized photograph can be larger than all the text, styles, and scripts on the page combined. When images are large, pages load slowly, especially on phones and slow connections. Readers may leave before the page finishes loading. Converting suitable images to a more efficient format is one of the simplest ways to improve that experience. WebP is one option for doing that, alongside resizing images, compressing them, and choosing the right format for each use.

What Is WebP

WebP is a modern image format that supports both lossy and lossless compression. Lossy compression removes some image data to make a much smaller file, with a small change in quality that is often hard to notice. Lossless compression keeps all the image data, while still reducing file size compared with an uncompressed image. WebP also supports transparency, which means it can be used for logos, icons, and graphics that need a see-through background. That combination makes it flexible: one format can handle photographs, illustrations, and graphics with transparency.

It helps to compare WebP with the formats you already know. JPG is widely used for photographs because it compresses photographic detail efficiently, but it does not support transparency. PNG is widely used for graphics, screenshots, and images that need transparency or sharp edges, but PNG files for photographs can be very large. WebP sits between them. It can compress photographs more efficiently than JPG in many cases, and it can compress graphics with transparency more efficiently than PNG in many cases. The exact saving depends on the image, its colors, its detail, and the quality setting you choose. A flat illustration may save more than a noisy photograph. A simple test on your own images is more useful than a generic claim about percentages.

Browser Support and Fallback

WebP is supported by all major modern browsers, including current versions of Chrome, Edge, Firefox, and Safari. That coverage is good enough for most public websites today. But support is not universal. Some older browsers, older devices, and some specialized tools may not display WebP images. If your audience includes people on very old systems, you should not assume every visitor can see a WebP file. The safe approach is to provide a fallback, so a browser that cannot display WebP still shows a JPG or PNG version.

The standard fallback uses the HTML picture element. You list the WebP version first, then a JPG or PNG version as a fallback, and the browser picks the first format it can display. For example, you can write a picture element that offers a WebP source and then an img element with a JPG source and alt text. A modern browser will use the WebP file. An older browser will ignore the WebP source and use the JPG. This approach gives you the size benefit for most visitors without leaving anyone with a broken image. If you use a content management system or an optimization plugin, it may generate this fallback for you, but you should still check that the fallback works by testing in an older browser or by disabling WebP support in your test setup if you can.

Fallback also matters outside browsers. Some email clients, messaging apps, design tools, and social platforms handle WebP differently. If you share an image outside your website, check whether the destination supports WebP. For a downloadable file, an email attachment, or a document that will be opened in many different programs, JPG or PNG is often a safer choice, because those formats are supported almost everywhere. Use WebP mainly for images served on your own website, where you control the fallback.

How to Switch to WebP

Switching to WebP does not have to mean converting every image at once. A careful, step-by-step approach avoids broken images and wasted work.

Keep your originals. Before you convert anything, keep a copy of the original JPG or PNG file in a clearly labeled folder. If a conversion looks bad or a tool needs the original later, you will need it.
Start with large images. Focus first on the largest photographs and hero images on your most visited pages. Those images have the biggest effect on loading time, so improving them gives the clearest benefit.
Resize before you convert. Do not serve a 4000-pixel-wide photograph in a 800-pixel-wide space. Resize the image to the largest size it will actually be displayed at, then convert. Resizing alone often saves more than changing format.
Convert a copy and compare. Convert one image to WebP, then open the original and the WebP version side by side at the display size. Zoom in on faces, text, edges, and areas of flat color. If you see smearing, banding, or lost detail, try a higher quality setting.
Choose a quality setting that preserves detail. For photographs, a mid-to-high quality setting often looks close to the original while still saving size. For graphics with text, use a higher quality or lossless setting if the text looks soft. Do not use the lowest quality just to get the smallest file.
Add a fallback. Use the picture element or your platform’s fallback option so older browsers still see a JPG or PNG version.
Test on a real page. Publish the change on one page first, clear your cache, and check the page on a phone and on a desktop. Confirm the image loads, the fallback works, and the page feels faster.
Roll out gradually. Once one page works, apply the same process to other important pages. You do not need to convert every decorative image on the same day.

Many image editors, online converters, and content management system plugins can convert images to WebP. Choose a tool you trust, keep your originals, and check the result before you replace the image on your site. If your site uses an image optimization plugin, it may convert images automatically when you upload them. Read its settings carefully, because automatic conversion can change file names, replace originals, or serve WebP without a fallback in some setups. A tool should help you, not hide the process from you.

Worked Example

Here is a worked example using a photograph you took yourself. The goal is to replace a large JPG hero image on a blog post with a smaller WebP version, with a JPG fallback.

Step 1: Start with the original. Suppose you have a photograph of a garden, saved as garden.jpg, that is 2400 pixels wide. You keep a copy in a folder named originals so you can return to it if needed.

Step 2: Resize. You check your site layout and see the image is displayed at most 1200 pixels wide. You resize the copy to 1200 pixels wide. This step alone makes the file much smaller, because the image now has fewer pixels to store.

Step 3: Convert and compare. You convert the resized copy to WebP at a quality setting that preserves detail, saving it as garden.webp. You open garden.jpg and garden.webp side by side at 1200 pixels wide. The leaves, the fence, and the sky look the same at a normal viewing distance. You zoom in and check the edges of the fence and the texture of the leaves. If they look clean, the quality setting is good. If they look smeared, you raise the quality and convert again.

Step 4: Add the fallback. You update the page to use a picture element. The picture element offers garden.webp first, and the img element inside it points to the resized garden.jpg with descriptive alt text, such as A garden bed with green leaves in morning light. A modern browser loads the WebP file. An older browser loads the JPG file. Both show the same image and the same alt text.

Step 5: Test. You load the page on a phone using a mobile connection and on a desktop, and you confirm the image appears, the text around it is readable, and the page loads without a broken image icon. You also check that the alt text is present. If everything looks right, you keep the change. If the image is missing on one device, you check the file names, the paths, and the fallback.

This example shows why the process matters. The benefit does not come from the file extension alone. It comes from resizing, choosing a sensible quality setting, comparing the result, and providing a fallback. If you skip those steps, you may get a smaller file that looks worse or that some visitors cannot see.

When Not to Convert

Do not convert already-small images. If an image is already small, sharp, and loads quickly, converting it will save very little and may add work or risk. A tiny icon, a small logo, or a simple graphic that is already a few kilobytes does not need a new format. The time you spend converting it is better spent on a large photograph that is slowing down a popular page. Similarly, do not convert an image that is already heavily compressed. Converting a low-quality JPG to WebP will not restore detail that was already lost. It may even add new artifacts. Start from the best original you have, not from a degraded copy.

Do not convert images that need to work in many different programs. If an image will be downloaded, attached to an email, opened in an older editor, or used in a document that will be shared widely, JPG or PNG is often safer. Do not convert images that rely on a feature WebP does not handle well in your workflow, such as a specific color profile or a format requirement from a printer, a marketplace, or a platform that asks for JPG or PNG. Always check the requirements of the destination before you convert. And do not convert a screenshot with small text unless you test it carefully. Text edges can soften with lossy compression, so a screenshot that needs to be readable may be better as a PNG or as a high-quality WebP with a lossless or near-lossless setting.

Limitations

WebP has limits you should keep in mind. First, the size saving varies. Some images save a lot, others save little. A noisy photograph, a detailed texture, or an image with many colors may not shrink as much as a simple graphic. Test your own images rather than assuming a fixed saving. Second, WebP does not fix other problems. If an image is too large for its display size, if a page loads many images at once, or if the server is slow, switching format alone will not solve the problem. Resizing, lazy loading, and good hosting still matter.

Third, conversion adds workflow steps. You need to keep originals, manage two file versions for fallback, and test the result. If your site has thousands of images, converting them all by hand is not practical. In that case, an automated tool with a fallback may help, but you should still test a sample of images and check that the tool preserves quality and alt text. Fourth, WebP is not a replacement for accessibility. Alt text, captions, and a clear page structure still matter. A smaller image that has no alt text is not better than a larger image that is described well.

Frequently Asked Questions

Is WebP better than JPG for photographs?

Often, yes, for images served on a website. WebP can produce a smaller file than JPG at a similar visual quality for many photographs. But the result depends on the image and the quality setting. Compare your own image at the display size, and choose the format that looks good at the smallest reasonable size.

Is WebP better than PNG for graphics?

Often, yes, for graphics with transparency served on a website. WebP can produce a smaller file than PNG for many graphics. But PNG is still a good choice for screenshots with small text, for images that need to work in many programs, or for cases where you need lossless quality and a simple workflow. Test the graphic and check the edges and text.

Do I need to keep the JPG or PNG version?

Yes, for two reasons. Keep the original as a backup, and keep a JPG or PNG version as a fallback for browsers and tools that do not support WebP. The picture element makes it easy to serve WebP to browsers that support it and a fallback to browsers that do not.

Will switching to WebP make my site load much faster?

It can help, especially if your pages have large photographs, but it is not a guarantee. The benefit depends on how large your images are, how many images are on the page, and what else is slowing the page down. Combine WebP with resizing, sensible quality settings, and other basic performance practices for the best result.

To decide whether to switch, start with one large image, resize it, convert it, compare it, and add a fallback. If the result looks good and loads faster, apply the same careful process to other important images. If the image is already small, needs to work in many programs, or loses quality when converted, leave it as JPG or PNG. WebP is a useful tool, not a rule that every image must follow.