Compress to 100KB is a free browser tool for fitting images under file upload limits. Choose 20, 50, 100, 150, 200 or 500 KB, or enter your own maximum. Process JPG, PNG, WebP and HEIC images on your device without uploading them or creating an account. Set pixel dimensions when needed, check the actual output size, and download individual images or a batch ZIP. Mobile users can preview results and access file sharing where their browser supports it. Very small limits may require reduced quality or dimensions.