Select a JPG or PNG photo. It is compressed on your device — nothing is uploaded anywhere.
Modern phone cameras produce 5–15 MB photos — far too large for quick sharing on WhatsApp, uploading to job portals, or attaching to emails with size limits. Compressing shrinks the file dramatically (often 70–90% smaller) while keeping the photo looking sharp on screens.
At 70–80% quality the difference is virtually invisible on screens. Only go below 50% if file size matters more than quality (e.g. thumbnails).
No hard limit — but very large images (50 MB+) may be slow on older phones since everything happens on your device.
Yes. PNGs (including screenshots) are converted to JPEG, which is much smaller for photographic content. For graphics with sharp text, keep quality at 85%+.
Never. Open your browser's network tab while compressing — you'll see zero uploads. Your images stay on your device.