When this tool is useful
Website photos where modern browser support and reduced transfer size are more important than legacy compatibility.
How local processing works
The JPEG is decoded once and re-encoded as WebP. The comparison view helps judge whether the new file is actually smaller at acceptable quality.
How to use it
- Choose the source files.
- Review the available settings and page order.
- Process locally, inspect the result, and download it.
Important limitations
Re-encoding cannot restore detail already lost in the JPEG, and repeated lossy conversions can add artifacts.
Verify the downloaded result
Reopen the downloaded file in its destination application, check dimensions or page count and visible content, and keep the source until the result has been accepted.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
Does this tool upload my files?
No. Processing happens in your browser; closing the page clears the working session.
Will the output always match the source exactly?
Re-encoding cannot restore detail already lost in the JPEG, and repeated lossy conversions can add artifacts.
What should I check before using the result?
Reopen the downloaded file in its destination application, check dimensions or page count and visible content, and keep the source until the result has been accepted.
Which browsers and devices are supported?
Use a current browser with JavaScript, workers, canvas, WebAssembly where the format requires it, Blob downloads, and enough memory. Reopen important downloads in the destination application.
Concrete input and output example
Input a 2.1MB camera JPEG and export WebP quality 82. If the result is 620KB, verify sky gradients and hair at 100%; conversion cannot remove artifacts already baked into the JPEG.
Browser compatibility notes
Reviewed against the implementation and required web APIs on 2026-08-12. Use a current browser where these APIs are available and verify important output on your device.
- Chrome / Edge (current desktop)
- Requires local decode, canvas, encoding, Blob download, and enough memory; verify the downloaded image.
- Firefox (current desktop)
- Uses the same standard local APIs; color rendering can differ slightly from Chromium.
- Safari (current desktop)
- Uses canvas and Blob downloads; available memory and codec behavior remain WebKit-controlled.
A tool-specific question
Can WebP remove JPEG artifacts?
No. The decoder sees artifacts as source pixels. A new lossy encoding can hide or add some patterns but cannot recover original detail.