What Is WebP? The Complete Guide to the Web's Best Image Format
If you've inspected a fast-loading website's images recently, there's a good chance you've encountered a .webp file without realizing it. WebP has quietly become the default image format for a huge portion of the web — and understanding why can help you make smarter choices about your own images.
What you'll learn
What is WebP, exactly?
WebP is an image format developed by Google specifically for the web, first released in 2010. Its core advantage is efficiency: WebP can produce both lossy and lossless compressed images that are significantly smaller than equivalent JPG or PNG files, while supporting features both older formats lack simultaneously — including transparency (like PNG) and animation (like GIF), all in one format.
WebP vs JPG vs PNG: file size comparison
Real-world results vary by image content, but typical findings across large-scale testing show consistent patterns:
| Comparison | Typical WebP Savings |
|---|---|
| WebP (lossy) vs JPG | 25-35% smaller at equivalent visual quality |
| WebP (lossless) vs PNG | 25-50% smaller with zero quality loss |
| WebP vs animated GIF | Often 60%+ smaller for the same animation |
These aren't marginal differences — for a website serving thousands of images per day, switching to WebP can meaningfully cut total bandwidth and improve load times across the board.
Browser support in 2025
WebP support is now essentially universal. Every major browser — Chrome, Firefox, Safari, Edge — has supported WebP natively for several years at this point, including on mobile. The format went from "risky to use" to "safe default" over the past few years, and there's no longer a meaningful compatibility reason to avoid it for most web use cases.
When to use WebP (and when not to)
Use WebP when:
- You're publishing images to a website and want the fastest possible load times
- You need transparency support but want smaller files than PNG would give you
- You're replacing animated GIFs with something more efficient
Stick with JPG or PNG when:
- You're sending an image via email to be opened in older desktop software (some legacy applications still lack WebP support)
- You need maximum compatibility with print workflows or older design software
- A specific platform or print service requires a different format explicitly
How to convert images to WebP
- Open a WebP converter tool.
- Upload your JPG, PNG, or other image file.
- Choose WebP as the output format.
- Adjust the quality slider if the tool offers one — 80-85% is a strong starting point.
- Download your new, smaller WebP file.
Try converting your images to WebP now
Open the Free WebP Converter →Frequently asked questions
Will converting to WebP hurt my SEO?
The opposite is true — page speed is a known ranking factor, and WebP's smaller file sizes directly contribute to faster load times, which search engines tend to reward rather than penalize.
Can WebP files have transparency like PNG?
Yes. WebP fully supports an alpha channel for transparency, matching PNG's capability while typically producing a smaller file size for the same image.
Is WebP the same thing as AVIF?
No, they're different formats. AVIF is a newer format that can achieve even smaller file sizes than WebP in many cases, but it has less universal support and slower encoding speed. WebP remains the more broadly compatible, "safe default" choice as of 2025.
Do I need special software to open a WebP file?
No — any modern web browser opens WebP files natively. On desktop, most current operating systems and image viewers also support WebP out of the box, though very old software occasionally requires a plugin or conversion to view it.
Make your images smaller without losing quality
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