The quick way
Open the compress image to 30KB tool, choose your picture and download the result. It finds the best quality that stays under 30KB and only shrinks dimensions if it has to.
Why 30KB is hard
A modern phone photo is 2 to 5MB, so reaching 30KB means cutting the file to around 1 percent. That works best with simple pictures like signatures, ID photos and scans on a plain background.
Tips for a better result
Crop away empty space first, use a plain background, and start from a JPG. Busy photos lose more detail at this size.
If it is still too big
Reduce the pixel size first with the resize tool, then compress. You can also try 50KB if the form allows it.
Private by design
Your picture is processed inside your browser and is not uploaded. See the full guide to reducing image size in KB.