KB Kit
Runs 100% in your browser

Compress Image to 15 KB

Some upload forms set a limit lower than 20 KB. This page is preset to 15 KB: drop in a JPG, PNG or WebP image and download a JPG at or under 15 KB.

KB
Drop images here or click to choose JPG, PNG or WebP. You can add up to 20 at once.

Output is always a JPG, and transparent areas turn white. The result is at or under your KB limit, but it is not guaranteed to meet a minimum size. If the form needs a minimum too, check the result before you upload. Need PNG or a transparent background? This tool is not the right fit.

The form also asks for pixel dimensions
px

Nothing is uploaded. Your images are compressed on this device.

When 20 KB is not small enough

If your file passes at 20 KB but the form wants less, 15 KB is the next step down. Check your form for its exact limit first; this page is only useful if the form really asks for 15 KB or less.

15 KB compared with 20 KB

Going from 20 KB to 15 KB means the tool has to drop the pixel size or the JPG quality a little further. With simple content, such as a plain-background face or a bold signature, the two results often look alike. With busy photos or small text, the 15 KB file may look softer. If the form accepts 20 KB, use that and keep the extra detail; if it asks for 15 KB or less, use this page and check the result at full size.

What 15 KB means for a picture

A phone photo holds millions of pixels, and 15 KB is a tiny fraction of that. The tool therefore makes the picture much smaller in pixels as well as lowering the JPG quality. It searches for the best quality that fits, and it will not go below JPG quality 0.4 or let the shorter side drop under 40 pixels. If it cannot fit inside those limits, it tells you instead of giving you an unreadable file.

What survives best is simple content: a tightly cropped face on a plain background, a bold signature, or a few lines of large text. Fine print, thin lines and busy photos suffer first.

How to get the best result

  1. Crop first so only the part you need is left.
  2. Enter the pixel size from the form, if it lists one, in the optional width and height fields. The image keeps its proportions and fits inside that box. It is never enlarged or cropped.
  3. Compress once from the original. Repeated compression adds blur.
  4. Open the result at full size. Check that your face, signature or text is still clear before you upload.

Before you upload

  • The output is always JPG, and transparent areas turn white. If the form needs PNG or PDF, this tool is not suitable.
  • The tool only enforces the upper limit. If the form also has a minimum size, check the size shown in the result.
  • This tool counts 1 KB as 1000 bytes, so a file under 15 KB here is also under 15 KB counted the 1024 way.

If the tool cannot reach 15 KB

  • Crop tighter around the subject and try again.
  • Use a plain, light background. Flat areas cost almost nothing.
  • If the form allows more, use 20 KB or 50 KB and keep more detail.
  • If you are already at 15 KB and the form asks for less, see 10 KB, and expect a visible loss in quality.

Frequently asked questions

Is my image uploaded to a server?

No. The image is compressed inside your browser on your own device and is not sent anywhere.

Will the file be exactly 15 KB?

No. The tool looks for the highest quality that still fits, so the result is at or under 15 KB.

Why is my picture smaller in pixels than before?

To fit 15 KB the tool may reduce the pixel dimensions as well as the quality. Check the pixel size shown in the result if the form requires specific dimensions.

Can I use this for a signature?

Yes, for signatures that the form accepts as images. Thin pen strokes can turn grey, so see the signature guide for how to prepare one.

Need a different limit? Use the custom size compressor.