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KBSize

Compress an image to 100 KB

Set to 100 KB already. Choose a photo and it will find the highest quality that still fits under 100 KB, without uploading anything.

Choose an image and it will be compressed here, in this browser. Nothing is uploaded.

Your image is never uploaded. Compression runs in this browser using the canvas API, and there is no server to send it to. This tool is provided free and without warranty — open the result before you submit it anywhere.

What 100 KB actually allows

100 KB is comfortable for a document scan, an ID photo or a profile picture at sensible dimensions. Most phone photos will need their dimensions reduced somewhat, but the result should still look good.

Nothing is uploaded

The compression happens in your browser. The image is never transmitted, never stored, and disappears when you close the tab — which matters, because files with a size limit attached are usually identity documents.

What fits inside 100 KB

A JPEG spends bytes on detail, so the number of pixels 100 KB can hold depends entirely on how busy the picture is. These are the rough budgets, and they are why a signature can stay large while a photograph of the same size limit has to shrink.

Kind of imagePixels it can affordRoughly, at 4:3
Signature or line drawing2,048,000about 1,650 × 1,240
Passport or ID photo853,333about 1,070 × 800
Scanned document page512,000about 830 × 620
Detailed photograph310,303about 640 × 480

Estimates from typical JPEG output at everyday quality. A detailed photograph gets about 310,303 pixels to work with at 100 KB — near enough 640 × 480. Anything bigger has to give up either dimensions or detail, and dimensions are almost always the better thing to give up.

Common questions

How do I reduce a photo to 100 KB?

Choose the file on this page. The target is already set to 100 KB, and the tool searches for the best quality that fits, offering to reduce the dimensions if quality alone cannot get there.

Does it work on a phone?

Yes. It runs in the browser on Android and iOS as well as on desktop, and handles HEIC photos from an iPhone.

What image dimensions fit in 100 KB?

Roughly 640 by 480 for a detailed photograph, and much larger — around 1,650 by 1,240 — for a signature or other flat image, because a JPEG spends its bytes on detail rather than on area. The tool works out the real numbers for your specific picture instead of guessing.

Why does my file come out at slightly under 100 KB rather than exactly 100 KB?

Because the target is a ceiling, not a goal. The form you are filling in rejects anything over 100 KB, so the tool searches for the highest quality that still lands underneath and stops once it is close, rather than risking an overshoot.

Other size targets