Drop a photo, get a copy guaranteed under 100 KB at the best quality that fits. Nothing is uploaded — it all happens in your browser.
100 KB shows up as the ceiling on portal document uploads, avatar fields, intranet CMSs and plenty of "attach a photo" forms. It's also a decent working definition of "email- and web-friendly": big enough to look good, small enough to load fast anywhere.
Around 1200 px on the long edge at solid quality for a typical photo — more if the image is graphically simple (screenshots, documents, logos compress far better than foliage or crowds). A scaled phone photo looks close to indistinguishable from the original at screen sizes. If you're preparing an avatar or a fixed-size thumbnail, set the max-edge field to the displayed size; the quality gain is free.
If the destination accepts WebP (most modern websites do; strict form portals often don't), pick it in the format selector — at 100 KB, WebP typically buys you visibly better quality or ~30% more resolution than JPEG from the same budget. When in doubt, JPEG is accepted literally everywhere.