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KBSize

Compress an image to 50 KB

Set to 50 KB already. Choose a photo and it will find the highest quality that still fits under 50 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 50 KB actually allows

50 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 50 KB

A JPEG spends bytes on detail, so the number of pixels 50 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 drawing1,024,000about 1,170 × 880
Passport or ID photo426,667about 750 × 560
Scanned document page256,000about 580 × 440
Detailed photograph155,152about 450 × 340

Estimates from typical JPEG output at everyday quality. A detailed photograph gets about 155,152 pixels to work with at 50 KB — near enough 450 × 340. 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 50 KB?

Choose the file on this page. The target is already set to 50 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 50 KB?

Roughly 450 by 340 for a detailed photograph, and much larger — around 1,170 by 880 — 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 50 KB rather than exactly 50 KB?

Because the target is a ceiling, not a goal. The form you are filling in rejects anything over 50 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