WebP vs PNG vs JPG — Complete Comparison
📅 June 2025 | ⏱️ 8 min read
For years, the image format debate was a two-horse race between PNG and JPG. Then Google introduced WebP in 2010, promising 25-35 % smaller file sizes with equivalent quality. Today, WebP has matured and is supported by over 96 % of browsers worldwide. But does that mean you should abandon PNG and JPG entirely? This in-depth comparison examines WebP, PNG, and JPG across every dimension that matters to web developers, designers, and site owners.
How WebP Works
WebP is an image format developed by Google that supports both lossy and lossless compression, as well as transparency and animation. It uses predictive coding to encode an image, which means it predicts the values of neighboring pixels and then encodes only the differences. This approach is fundamentally different from JPG's discrete cosine transform and PNG's DEFLATE compression.
In lossy mode, WebP typically achieves 25-35 % smaller file sizes than JPG at equivalent SSIM (structural similarity) quality. In lossless mode, WebP files are about 26 % smaller than PNG. WebP also supports an alpha channel for transparency, something JPG cannot do at all. For animations, WebP competes with GIF, offering smaller file sizes and support for more colors.
WebP vs PNG vs JPG: Side-by-Side Comparison
File Size
WebP produces the smallest files across almost all scenarios. A 1 MB JPG photograph is roughly 700 KB as lossy WebP at the same visual quality. A 500 KB PNG screenshot becomes about 370 KB as lossless WebP. The savings are most dramatic for photographic content and decrease for simple flat-color graphics, where PNG-8 already achieves excellent compression. For web developers focused on Core Web Vitals and page speed, switching to WebP can reduce image-related page weight by 30 % or more without any visible quality loss.
Image Quality
At high bitrates (high quality settings), all three formats are visually indistinguishable. The differences emerge at lower bitrates. JPG introduces blocky artifacts and color banding. PNG-8 shows dithering patterns when the image has more than 256 colors. WebP maintains better perceptual quality at low bitrates thanks to its more sophisticated compression algorithm. However, some designers note that WebP can produce a slight halo effect around sharp edges at very low quality settings, a characteristic artifact unique to the format.
Transparency Support
PNG and WebP both support full alpha transparency. JPG does not support transparency at all. If your image needs a transparent background for use on different colored backgrounds, JPG is not an option. WebP's transparency support is technically excellent, but some graphics software still has bugs or limitations when handling alpha channels in WebP. PNG remains the most reliable choice for transparency across all workflows.
Browser Support
As of 2025, WebP is supported in Chrome, Firefox, Safari (14+), Edge, Opera, and most mobile browsers. Global support exceeds 96 %. The only notable gaps are some older versions of Safari (pre-14) and a handful of niche browsers. Internet Explorer, which Microsoft officially retired in 2022, does not support WebP. For production websites, it is best practice to serve WebP with a fallback to JPG or PNG using the
Software and Tooling Support
JPG and PNG have universal support in every image editor, CMS, and development tool ever made. WebP support has grown significantly but is not universal. Adobe Photoshop added WebP export support in 2021. Figma supports WebP export natively. WordPress has supported WebP uploads since version 5.8. However, some older image libraries, desktop applications, and enterprise DAM systems still do not handle WebP correctly.
When to Use WebP
WebP is the best choice for production websites where page speed matters. If you are building a new website or redesigning an existing one, serving WebP images with appropriate fallbacks will reduce your page weight, improve your Lighthouse scores, and deliver a faster experience to users. Ecommerce sites, news publishers, and image-heavy blogs see the biggest benefits from switching to WebP.
Use WebP for product photos, blog post images, hero banners, thumbnails, and background images. The format excels wherever you currently use JPG but want smaller files. For images that require transparency, WebP works well as a PNG replacement, but always test the alpha channel rendering in Safari before deploying.
If you need to convert existing images to WebP, try our free WebP to PNG converter for reverse conversions, or use our PNG to JPG converter for the classic fallback formats.
When to Stick with PNG
PNG remains the best choice for images that need pixel-perfect accuracy. Screenshots, UI mockups, logos, icons, and any image with text should be authored and stored as PNG. Design software still handles PNG more reliably than WebP, and PNG files compress well for the types of images that benefit from lossless storage.
PNG is also the safest choice when distributing images to an audience that may use older browsers or outdated software. If your users include government agencies, educational institutions, or enterprise clients with locked-down IT environments, PNG guarantees compatibility. For screenshots and documentation, PNG's lossless quality ensures that text remains crisp and readable regardless of viewing conditions.
When to Stick with JPG
JPG is still a practical choice for photography in contexts where you control the image pipeline. Digital cameras, smartphones, and most stock photography platforms output JPG by default. If you are downloading photos from a stock site and using them directly, they are already JPG. Converting them to WebP gains you file size savings but adds an extra processing step.
JPG also has the advantage of universal support in every email client. If you are embedding images in an email newsletter, JPG is safer than WebP because Apple Mail, Gmail, and Outlook all handle JPG flawlessly. WebP in email is not yet universally supported.
How to Implement WebP with Fallbacks
The recommended approach for production websites is to use the HTML
<picture>
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="Description">
</picture>
This pattern works in every browser. Older browsers that do not understand the tag directly. Modern browsers that support WebP will load the WebP source and skip the fallback. Content delivery networks like Cloudflare and Akamai can also perform on-the-fly WebP conversion.
Conclusion
In 2025, the answer to "WebP vs PNG vs JPG" is no longer one-size-fits-all. WebP offers the best compression and is the right choice for most website images. PNG remains essential for screenshots, transparency, and compatibility-sensitive contexts. JPG has become the fallback format, a role it fills admirably thanks to its universal support. The smartest strategy is to use all three: author and store master images as PNG, serve WebP to modern browsers, and fall back to JPG when needed.