Compare JPG and WebP for a Web Image
Evaluate a WebP export against the JPEG source using both file size and visible quality instead of a codec-size promise.
Use the interactive tool ↓Define a fair comparison
Compare the same image dimensions and viewing size. Resizing one version while only changing the codec of another mixes two different effects. Keep the JPEG source and record the downloaded WebP size before deciding whether the conversion helps your website or application.
JPG to WebP
Drop images here or click to browse
Select JPG images — converted to WEBP in your browser. Nothing is uploaded.
Run one controlled test
Choose a representative photograph with fine texture and smooth gradients. Start at the default quality, download the WebP and view it at the same scale as the source JPEG. Compare faces, text, edges and any visible banding.
- Keep the source dimensions unchanged for the first comparison.
- Convert and note actual input/output sizes.
- Adjust quality one step at a time if needed.
- Test the selected output in the real browser or receiving system.
For example, if the output is 90 KB and the source is 120 KB under the same display convention, that is a measured reduction for this file. It is not evidence that every photo will shrink by the same fraction.
Understand successive lossy encodings
The source JPEG may already have lost detail. Re-encoding as WebP cannot reconstruct that detail, and a lower quality setting can discard more. A modern format is not an image-enhancement operation. If you have a higher-quality original, start from that source when appropriate.
The browser canvas implementation uses a lossy WebP quality parameter. It does not expose every WebP encoder option, an explicit lossless mode, or an exact-byte target. Its quality number is not directly comparable to every JPEG encoder’s scale.
Keep compatibility and metadata in view
Confirm that the receiving channel accepts WebP, including any upload validators and downstream editing applications. An opaque JPEG does not acquire useful transparency merely because WebP supports alpha. The converted file also does not promise to retain original metadata or archival byte identity.
For dimensions rather than codec changes, use Image Resizer first and document the change. For a JPG-only destination, WebP to JPG is available, but the reverse conversion is another encoding step rather than a way to recover the original JPEG bytes.
Troubleshoot an unexpectedly larger file
Re-encoding an already efficient image can increase size. Inspect the actual output and try a different quality only if the visual tradeoff is acceptable. Do not repeatedly convert between formats expecting each pass to improve the picture or guarantee a smaller result.