WebP Guide: Why & How to Use WebP Images on Your Website (2026)

Learn everything about WebP — what it is, why it outperforms JPG and PNG, how to convert your images, and how it directly boosts your PageSpeed score and Core Web Vitals.

What Is WebP? {#what-is-webp}

WebP is a modern image format developed by Google in 2010, designed specifically for the web. It delivers superior compression — both lossy and lossless — while maintaining high visual quality. Unlike older formats, WebP supports:

• Lossy compression — like JPEG, but significantly smaller file sizes
• Lossless compression — like PNG, but 26% smaller on average
• Transparency (Alpha channel) — something JPEG cannot do
• Animation — a far more efficient alternative to GIF

Google developed WebP based on the VP8 video codec, which is the same technology used in high-efficiency video compression. This gives it a compression advantage that neither JPEG nor PNG can match.

💡 Key Fact: According to Google’s own benchmarks, WebP lossless images are 26% smaller than PNGs, and WebP lossy images are 25–34% smaller than comparable JPEG images at equivalent quality.

WebP vs. JPG vs. PNG: A Full Comparison {#comparison}

Understanding when to use each format starts with knowing their strengths and limitations.

Size & Quality Overview

Real-World File Size Comparison

To make this concrete, here is a typical breakdown of the same image saved in each format at equivalent quality:

The pattern is clear: WebP consistently delivers smaller files without a visible quality difference — making it the best all-purpose format for web use.

Why You Should Use WebP on Your Website {#why-use-webp}

Images typically account for 50–65% of a webpage’s total file size. That makes image optimization one of the highest-impact performance improvements you can make. Here is why WebP is the right choice:

1. Faster Page Load Times

Smaller images load faster — simple as that. When your hero image drops from 280 KB to 185 KB, users see your page content sooner. On slower mobile connections (3G/4G), this difference is even more dramatic.

2. Better Core Web Vitals Scores

Google’s Core Web Vitals measure real-world loading performance. The Largest Contentful Paint (LCP) metric — which tracks how quickly the main image or content block loads — is directly affected by image size and format. Switching to WebP is one of the fastest ways to improve your LCP score.

🔗 Learn more: How Image Optimization Affects Core Web Vitals

3. Higher PageSpeed Insights Scores

Google PageSpeed Insights (and Lighthouse) specifically flag images that are not in next-gen formats like WebP. Converting your images eliminates this audit warning and directly contributes to a higher Performance score.

🔗 Want to boost your score further? Check out our PageSpeed Tips Guide for a full breakdown of performance improvements.

4. Lower Bandwidth Costs

If your hosting plan charges for bandwidth or your CDN bills per GB, serving WebP images instead of PNGs and JPEGs can noticeably reduce your monthly costs — especially if your site receives significant traffic.

5. Better Mobile Experience

Mobile users on limited data plans benefit enormously from WebP. Smaller files mean faster loading, less data consumption, and lower bounce rates. Since mobile traffic accounts for over 60% of global web traffic in 2025, this matters significantly.

6. Replaces Three Formats at Once

Before WebP, you needed:

• JPG for photos
• PNG for transparent images
• GIF for animations

WebP handles all three scenarios — often better than the original formats. This simplifies your asset pipeline and reduces complexity.

How to Convert Images to WebP {#how-to-convert}

Converting images to WebP is straightforward. Here are the most common methods:

Method 1: Online Converters (Easiest)

Online tools require no installation and work for occasional conversions. Simply upload your image, select WebP as the output format, adjust quality settings if needed, and download the result.

Best for: Small projects, one-off conversions, quick testing.

Method 2: Desktop Software

Adobe Photoshop (with the WebP plugin), GIMP (free, built-in WebP support), and Squoosh (Google’s open-source desktop/web app) all support WebP export. These tools give you fine-grained control over quality settings and compression.

Best for: Designers and developers who process images regularly.

Method 3: Command Line with cwebp (Advanced)

Google provides the cwebp command-line tool for batch processing and automation:

# Convert a single image
cwebp -q 80 input.jpg -o output.webp

# Convert all JPGs in a folder
for file in *.jpg; do cwebp -q 80 "$file" -o "${file%.jpg}.webp"; done

The -q flag controls quality (0–100). A value of 75–85 is typically the sweet spot between size and quality.

Best for: Developers, automated workflows, large-scale batch conversions.

🔗 Need to convert many images at once? Our Batch Convert Guide walks you through the complete workflow.

Method 4: CMS Plugins (WordPress & Others)

If you use WordPress, plugins like Imagify, ShortPixel, Smush, or WebP Express can automatically convert new and existing images to WebP on upload or on-the-fly. This is the most hands-off approach for content-heavy sites.

Best for: WordPress sites, non-technical users, large image libraries.

Method 5: Server-Side Conversion

Your server can dynamically serve WebP to browsers that support it while falling back to JPG/PNG for older browsers. This is achieved via:

• Nginx: image_filter module or third-party modules
• Apache: mod_rewrite rules combined with .htaccess
• CDN-level conversion: Cloudflare Polish, Cloudinary, or Imgix can handle this automatically

Best for: High-traffic sites requiring zero manual effort.

WebP Browser Support in 2025 {#browser-support}

One of the biggest early objections to WebP was limited browser support. That concern is now largely obsolete.

Browser Support Table (2025)

Over 97% of global internet users now use a browser that supports WebP. Internet Explorer 11 is the only major holdout, but it has been officially retired by Microsoft and represents a negligible share of traffic.

Handling the Fallback (for the Remaining 3%)

If you still need to support older browsers, use the HTML <picture> element to provide a fallback:

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

This tells the browser: “Use WebP if you can; otherwise, fall back to JPG.” Modern browsers will pick WebP automatically, while older ones will use the JPG without any issues.

How WebP Impacts SEO and Core Web Vitals {#seo-impact}

Google’s ranking algorithm has incorporated page speed and user experience signals since the 2021 Page Experience update. WebP directly influences several of these signals:

LCP (Largest Contentful Paint)

LCP measures how long it takes for the largest visible element — usually a hero image or banner — to load. Serving that image as WebP instead of JPG/PNG reduces its file size by 25–35%, which directly shortens the LCP time.

FCP (First Contentful Paint)

First Contentful Paint tracks how quickly any content appears on screen. Since images are often the first meaningful content, smaller WebP files contribute to a faster FCP.

CLS (Cumulative Layout Shift)

While WebP does not directly affect CLS, properly specifying width and height attributes on your WebP images prevents layout shifts as the page loads — a common CLS issue with images.

PageSpeed Insights Audit

When you run your site through Google PageSpeed Insights, one of the most common recommendations is “Serve images in next-gen formats.” Converting to WebP resolves this audit entirely.

🔗 See our full guide: Image Compression Guide — Reduce Image File Size

When NOT to Use WebP {#when-not-to-use}

WebP is excellent for almost every web use case, but there are a few situations where alternatives may be more appropriate:

1. Print or High-Resolution Design Files

If you are producing images for print, billboards, or high-resolution design work, use TIFF or RAW formats. WebP is optimized for screen display, not print production.

2. Email Clients

Many email clients — including older versions of Outlook — do not render WebP. For email marketing campaigns, stick to JPG or PNG to ensure compatibility.

3. Open Graph / Social Media Sharing

When specifying OG (Open Graph) images for social media previews, it is safer to use JPG or PNG, as some platforms and link-unfurling services do not fully support WebP.

4. When You Need Maximum Editing Flexibility

For source files and images you will edit repeatedly, keep your originals in a lossless format (like PNG or TIFF). Convert to WebP only for the web-ready, final version.

Best Practices Checklist {#checklist}

Use this checklist to ensure you are getting the most out of WebP:

• ✅ Convert all photos and hero images to WebP
• ✅ Use lossy WebP at quality 75–85 for photographs
• ✅ Use lossless WebP for logos and images with transparency
• ✅ Always include a JPG/PNG fallback using <picture> + <source>
• ✅ Specify width and height on all <img> tags to prevent CLS
• ✅ Combine WebP with lazy loading (loading="lazy") for off-screen images
• ✅ Use a CDN that auto-serves WebP when the browser supports it
• ✅ Run PageSpeed Insights before and after to measure improvement
• ✅ Keep original source files in PNG/JPG — never edit a lossy WebP repeatedly

Frequently Asked Questions {#faq}

Q: Does converting to WebP reduce image quality?
Not noticeably. At a quality setting of 80–85, WebP images look visually identical to their JPG/PNG counterparts to the human eye, while being significantly smaller in file size.

Q: Can I use WebP on WordPress?
Yes. WordPress has supported WebP natively since version 5.8 (2021). Plugins like ShortPixel, Imagify, and Smush can also automatically convert and serve WebP images to compatible browsers.

Q: Is WebP better than AVIF?
AVIF is a newer format with even better compression than WebP, but browser support is still catching up (around 90% in 2025). WebP remains the safer, more universally supported choice right now. For a deep comparison, see our Image Formats Guide: JPG vs PNG vs WebP.

Q: Will switching to WebP help my Google rankings?
Indirectly, yes. WebP improves page speed and Core Web Vitals scores, which are confirmed Google ranking signals. Faster pages also tend to have lower bounce rates and higher engagement — both of which correlate with better rankings.

Q: What quality setting should I use for WebP?
For photographs: 75–85 is the sweet spot. For images with fine text or sharp lines: 85–90. For maximum compression (banners, thumbnails): 60–75. Test at different settings to find the right balance for your specific images.

Q: Does WebP support EXIF metadata?
Yes, WebP supports EXIF, XMP, and ICC color profiles, so your image metadata is preserved during conversion.

Conclusion

WebP is no longer a “nice to have” — in 2025, it is the standard. With 97%+ browser support, consistent file size savings of 25–35%, support for transparency and animation, and a direct positive impact on Core Web Vitals and PageSpeed scores, there is no compelling reason to keep serving JPG and PNG files to your users when WebP performs better in every measurable way.

Start by converting your most impactful images — hero banners, product photos, and above-the-fold content — and measure the difference with PageSpeed Insights. The results will speak for themselves.

🔗 Related Resources:

• Image Compression Guide — Reduce Image File Size
• Core Web Vitals & Image Optimization
• PageSpeed Tips Guide
• Image Formats Guide: JPG vs PNG vs WebP