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Supports JPG, PNG, WebP (multiple files allowed)
Speed Up Your Site and Boost SEO Rankings with WebP Image Conversion
Page load speed is a critical SEO ranking factor, and image optimization is one of the most impactful improvements you can make. This tool batch-converts JPEG and PNG images to the next-generation WebP format while also allowing you to resize them -- all within your browser.
What Is WebP? Advantages Over JPEG and PNG
WebP is a next-generation image format developed by Google. Compared to traditional formats, it can significantly reduce file sizes while maintaining visual quality.
| Feature | JPEG | PNG | WebP |
|---|---|---|---|
| File size | Baseline | Large | 25-35% smaller than JPEG |
| Transparency (alpha) | Not supported | Supported | Supported |
| Animation | Not supported | Not supported | Supported |
| Browser support | 100% | 100% | 97%+ |
* Browser support data is based on global statistics as of 2026. All major browsers except IE 11 support WebP.
Core Web Vitals -- Improving LCP Through Image Optimization
Among the Core Web Vitals that Google uses as search ranking signals, LCP (Largest Contentful Paint) is the metric most closely tied to images.
- What is LCP? -- The time it takes for the page's main content (often the hero image) to become visible. Google's benchmark is under 2.5 seconds.
- Impact of image size -- A single unoptimized image (e.g., a 5 MB photo) can drastically worsen your LCP score. Simply converting to WebP and resizing to match the display dimensions can dramatically improve LCP.
- Practical guidelines -- For blog post images, a width of 800-1280 px with quality set to 0.75-0.85 in WebP format offers the best balance. Thumbnails are fine at 640 px or less.
Safe and Private -- Everything Stays in Your Browser
This tool processes all images entirely within your browser using the HTML5 Canvas API. No images are ever uploaded to a server. You can safely process confidential screenshots or unreleased product photos without worry.
- No server uploads -- Images are processed only on your device
- No data stored or transmitted -- All processed data is gone once you close the page
- No account required -- Just open the URL and start using it right away