Email attachments, job portals and school uploads often cap images at 100 KB. Here’s how to get any JPG or PNG under that limit in your browser — no software, no upload.
A modern phone photo is often 3–6 MB — that’s 3,000–6,000 KB, dozens of times over a 100 KB limit. Two things make a file big: the pixel dimensions (how many pixels wide and tall) and the quality (how much detail is kept). Reduce either, and the file shrinks.
💡 Rule of thumb: halving the width and height cuts the pixel count to a quarter — often the fastest way to drop a stubborn file under the limit while keeping it sharp.
Get the smallest file that still looks good
Resize to what you need. If the upload displays small, 800–1200 px is plenty.
Prefer JPG for photos, PNG for graphics with text or sharp edges.
Compress in one pass. Repeatedly re-saving a JPG loses quality each time.
FAQ
How do I make a photo exactly 100 KB? Lower the quality until the size sits just under 100 KB. If it won’t go low enough, reduce the pixel dimensions too.