How to reduce a photo to 100 KB, 50 KB or 20 KB

1. 1Step 1: Open Reduce image size in KB.
2. 2Step 2: Add your JPG or WebP photo (up to 25 MB; up to 50 files at once).
3. 3Step 3: Enter the Target size in KB, for example 100.
4. 4Step 4: Leave Reduce dimensions if needed switched on unless the form also requires exact pixel dimensions.
5. 5Step 5: Click Start. The result shows the size actually achieved — always at or under your target.

Behind the scenes the tool tries different quality levels and keeps the highest one that fits, so you get the best-looking photo that meets the limit rather than an over-compressed one.

Every image has a floor: even at the lowest quality, a large photo with lots of detail takes up a certain amount of space. If that floor is above your target, there are two honest options:

• Allow resizing. With the option on, the tool scales the photo down step by step until it fits. A 4000-pixel phone photo is far bigger than any form needs, so this usually looks fine.
• Raise the target. If you switch resizing off and the target can't be met, you'll see a clear message with the smallest size that was possible, instead of a file that quietly breaks the rule.

There are two conventions: 1 KB = 1,024 bytes (used by Windows and many upload forms) and 1 KB = 1,000 bytes. This tool uses 1,024 bytes, which is the stricter of the two for limits, so a file it calls 100 KB is accepted by forms using either convention.

• Crop out empty background first so the bytes are spent on the subject.
• Plain, evenly lit backgrounds compress much better than busy ones.
• Start from the original photo, not one that has already been compressed by a messaging app.
• If your photo is already under the target, the tool keeps it unchanged and tells you — no need to re-encode.