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KBSize

Compress an image to 30 KB

Set to 30 KB already. Choose a photo and it will find the highest quality that still fits under 30 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 30 KB actually allows

30 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 30 KB

A JPEG spends bytes on detail, so the number of pixels 30 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 drawing614,400about 910 × 680
Passport or ID photo256,000about 580 × 440
Scanned document page153,600about 450 × 340
Detailed photograph93,091about 350 × 260

Estimates from typical JPEG output at everyday quality. A detailed photograph gets about 93,091 pixels to work with at 30 KB — near enough 350 × 260. 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 30 KB?

Choose the file on this page. The target is already set to 30 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 30 KB?

Roughly 350 by 260 for a detailed photograph, and much larger — around 910 by 680 — 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 30 KB rather than exactly 30 KB?

Because the target is a ceiling, not a goal. The form you are filling in rejects anything over 30 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