Reduce image file size from MB to KB in your browser. Combine smart lossy compression, format optimization, and resolution scaling with live byte comparison.
Custom target KB input (from 15 KB up to 5,000 KB) with iterative binary search
Combined quality + resolution scaling controls for aggressive MB-to-KB reduction
Supports batch processing of large camera photos with ZIP export
Transparent background color selector when converting to JPEG
Frequently Asked Questions
What is the best way to reduce a 10MB photo to under 150KB?
Keep "Allow automatic dimension scaling" checked and select JPEG or WebP output. Scaling a 4000px image down to ~1400px while encoding at ~78% quality looks much sharper than keeping 4000px at 5% quality.
Does this file size reducer watermark my images?
Never. All outputs are 100% clean, watermark-free, and processed privately on your device.