These tools run in your browser. Source images are not uploaded to Image Load Lab.
Image optimizer
Resize and encode one JPEG, PNG, or WebP. Compare actual byte sizes, inspect the result, and download it.
Srcset builder
Turn layout widths into copy-ready width-descriptor markup and a transparent size estimate.
Privacy and limits
Both tools execute locally. Browser encoders differ, and estimates are not production promises. Record your browser version and verify the output in the page that will use it.