What is WebP? Benefits, Drawbacks, and Browser Support

Introduction

WebP is often the fastest way to shrink image files without changing how they look. The format has become a default choice for web images because it delivers smaller files across a wide range of content types — from photographs to icons with transparency.

Many teams still ship large PNGs and JPGs because format choices feel confusing. Terms like "lossy" and "lossless" add to the uncertainty, and compatibility concerns keep people stuck on older formats. This guide explains what WebP actually is, what it does well, where it falls short, and how browser support works today.

By the end, you will understand when WebP is the right choice and how to convert your images to WebP with confidence.

What WebP Is (and What It Is Not)

WebP is a raster image format developed by Google and released in 2010. Like PNG and JPG, it stores images as a grid of pixels. Unlike those formats, it was designed from the start to optimize for both size and quality across different image types.

WebP supports two compression modes:

• Lossy compression — Reduces file size by discarding some image data. Best for photographs and complex images where small quality trade-offs are acceptable.
• Lossless compression — Preserves every pixel exactly. Best for logos, UI elements, and graphics with sharp edges and flat colors.

WebP also supports transparency (alpha channel) in both modes, which PNG supports but JPG does not. Additionally, WebP can contain animations, making it a potential replacement for GIF in some cases.

What WebP is not: it is not a vector format (use SVG for that), it is not ideal for archival purposes where you need maximum editability, and it is not universally supported by all image editing tools — though support has improved significantly.

Why WebP Files Are Smaller

WebP achieves smaller file sizes through more efficient compression algorithms. For lossy images, it uses a technique similar to VP8 video compression, which analyzes blocks of pixels and predicts values based on surrounding data. This approach handles gradients and complex textures well.

For lossless images, WebP uses a combination of techniques including spatial prediction, color transformation, and entropy coding. The result is often a smaller file than an equivalent PNG, though the difference varies by image content.

The practical outcome is straightforward: the same image, at the same visual quality, usually takes fewer bytes in WebP format. This matters for web performance because smaller images mean faster page loads and less bandwidth usage.

To learn more about choosing between compression modes, read our guide on lossy vs lossless WebP.

Browser Support and Compatibility

WebP decoding is now supported by all major browsers: Chrome, Firefox, Safari, Edge, and Opera. Safari added support in 2020 (macOS Big Sur and iOS 14), which was the last major holdout. This means you can serve WebP to the vast majority of users without compatibility issues.

For the small percentage of users on older browsers, you can use the HTML <picture> element to provide a fallback:

<picture>
  <source srcset="image.webp" type="image/webp" />
  <img src="image.jpg" alt="Example image" />
</picture>

This pattern serves WebP to browsers that support it and falls back to JPG or PNG for those that do not.

One technical note: converting images to WebP in the browser requires WebP encoding support via Canvas. Modern browsers handle this, but the conversion capability is separate from the ability to display WebP images. Tools like img2webp.com use Canvas-based encoding to generate WebP files directly in your browser.

When to Use WebP (and When Not To)

WebP is a strong default for web image delivery. Use it when:

• File size matters — Faster page loads, lower bandwidth costs, better Core Web Vitals scores.
• You need transparency — WebP handles alpha channels well, often with smaller files than PNG.
• You are serving photos — Lossy WebP typically beats JPG on size at similar quality.
• You want one format — WebP works for both photographic and graphic content.

Consider keeping PNG or JPG when:

• Your pipeline requires it — Some CMS platforms, email clients, or legacy tools do not accept WebP.
• You need maximum compatibility — Although rare, some environments still lack WebP support.
• You need extreme lossless precision — For archival or editing workflows, PNG may be preferred.

If maximum compression is critical and you can accept narrower browser support, AVIF is worth exploring — it often compresses even better than WebP, though support is not yet as universal.

How to Convert Images to WebP

Converting images to WebP is straightforward with img2webp.com:

1. Upload your image — Drag and drop, browse, paste from clipboard, or import from URL or cloud storage.
2. Choose your settings — Select lossy or lossless mode. For lossy, adjust the quality slider.
3. Download the result — Save the WebP file or download multiple files as a ZIP archive.

For step-by-step instructions, follow our JPG to WebP tutorial for photographs or our PNG guide for transparent images.

Summary

WebP is a practical default for web images. It balances file size, quality, and features — supporting both lossy and lossless compression, transparency, and animation. Browser support is now universal for decoding, and conversion tools make it easy to adopt.

The format is not always the answer — some workflows require PNG or JPG — but for web delivery, WebP usually wins on size without sacrificing visual quality.