Google's PageSpeed Insights will flag every non-WebP image on your site. Chrome, Firefox, Safari, and Edge all support it. Converting your images to WebP is one of the highest-ROI performance improvements you can make — and with ToollyX's Image Converter, it takes about fifteen seconds per batch.
Why WebP Wins on Size
WebP was developed by Google and released in 2010, derived from the VP8 video codec. It uses a more sophisticated compression algorithm than JPEG or PNG:
- vs JPEG: 25–34% smaller at equivalent visual quality, because WebP uses predictive coding that accounts for neighbouring blocks more efficiently.
- vs PNG: 26% smaller for lossless compression; even smaller for lossy with transparency (PNG-24 doesn't support lossy at all).
- Supports transparency: Unlike JPEG. Unlike PNG-24, it can do it at smaller sizes with lossy encoding.
- Supports animation: WebP can replace GIF animations at dramatically smaller file sizes.
How to Convert: Batch WebP Conversion on ToollyX
The Image Converter handles multiple files in a single run. Here's the exact workflow:
The four format buttons — JPG, PNG, WebP, BMP — sit at the top. Click WebP before uploading. The tooltip says "Best compression + transparency."
Default is 85. This is the sweet spot — perceptually indistinguishable from 100 but significantly smaller. For hero images where quality is critical, use 90. For thumbnails or icons, 70–75 is fine.
Drag multiple files at once into the drop zone. The tool processes all of them simultaneously and shows original vs converted size for each file.
Each converted image has its own Download button. The size comparison shows exactly how much space you saved per file.
Quality Setting: What Number Should You Use?
| Quality | Use Case | Typical Size vs JPEG |
|---|---|---|
| 90–100 | Hero images, print-quality assets | −20 to −30% |
| 80–89 | Blog images, product photos | −30 to −40% |
| 70–79 | Thumbnails, social previews | −40 to −50% |
| 60–69 | Very small file size needed, quality acceptable | −50 to −60% |
| Below 60 | Not recommended — visible artefacts appear | −60%+ |
PNG to WebP: Preserving Transparency
This is where WebP really shines. A logo with a transparent background as PNG-24 might be 180KB. The same logo as WebP at quality 85 might be 40–60KB — with transparency fully preserved. The Image Converter handles this automatically: when converting a PNG with an alpha channel to WebP, transparency is retained.
Note: Converting to JPG loses transparency (the tool fills white). If transparency matters, convert to WebP or PNG only.
Browser Compatibility in 2026
WebP is supported by 97%+ of browsers globally as of 2026. The only legacy holdout was Internet Explorer, which is effectively dead. If you're still supporting IE (you shouldn't be), you'd need a JPEG fallback via the HTML <picture>element. For everyone else, WebP is safe to deploy as the primary format.
After Converting: Next Steps
- Resize before deploying — Use the Image Resizer to hit the exact pixel dimensions your CMS or design system needs.
- Compress further if needed — The Image Compressor applies additional lossy compression on top of the WebP encoding.
- Crop for aspect ratio — Social platforms have specific aspect ratios. The Image Cropperlets you drag to your exact crop area.
Batch convert JPG, PNG, and BMP. Adjust quality. No upload to server.