Meet a 100 KB upload requirement
100 KB is a common ceiling for university and college application portals, government e-form uploads, ID card printing systems, and other places that ask for a decent-quality photo without accepting full-size camera files.
This page opens Downscale Image with the file-size target pre-set to 100 KB. Upload your photo and the tool automatically works out the best combination of quality and resolution to land at or under that size.
At 100 KB, most photos — including fairly detailed ones — compress down while still looking clean and sharp, since there's meaningfully more room to work with than at 20 or 50 KB. Only very large, highly detailed, high-resolution originals are likely to need a visible resolution reduction to fit.
Everything runs locally in your browser. Your photo, and any personal information in it, is never uploaded to a server just to get it under a size limit.