When should you use WebP?
WebP is a modern image format that supports lossy and lossless compression as well as transparency. For many website photos and graphics, it is a practical format to test when preparing assets for the web.
Converting does not guarantee a smaller file in every case. The result depends on the source format and content, the quality setting, dimensions and the browser encoder. PixoSift shows the generated size so you can compare before using it.
WebP can be useful for photographic images and web graphics where file size matters. If you need a lossless source, are working with a format-specific workflow, or see visual artefacts, compare alternate settings and keep the original. Verify that the format fits your publishing requirements.
What to check before converting
Converting a file changes how its image data is encoded; it does not automatically improve every image. Use the checklist below to choose a sensible workflow.
| Source / use case | Good first test | Check after conversion |
|---|
| JPEG photograph | WebP around quality 80–85. | Texture, faces, gradients and whether the file is actually smaller. |
| PNG with transparency | WebP if a smaller file is important; PNG if lossless output is required. | Transparent edges, shadows and semi-transparent pixels. |
| Screenshot or interface image | Compare high-quality WebP with PNG. | Small text, thin lines and icons at normal size. |
| Animated GIF | Do not use this workflow when you need animation preserved. | The current browser workflow converts a decoded frame, not the complete animation. |
Keep the original until you verify the output
Browser-based conversion re-encodes image pixels and may not preserve metadata such as EXIF information or the original encoding. If metadata, animation, colour-management details or archival fidelity matter, test with a copy and use a specialist workflow when necessary.
PixoSift does not upload selected images to a PixoSift image-processing server.
Try a WebP conversionFormat advantages and trade-offs
Choose a format based on the content and the publishing workflow, not only on the extension. The browser's encoder and the selected quality affect the result.