KB Kit
Runs 100% in your browser

Compress Image to 20 KB

20 KB is a tight limit that some upload forms set, for example for signatures and small ID photos. This page is preset to 20 KB – just drop your image in.

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.

Getting a clear image under 20 KB

20 KB is very little space, so a large photo has to become much smaller in pixels, not just lower in quality. The tool does this automatically, but you will get a sharper result if you help it:

  • Crop tightly around your face or signature before compressing.
  • Enter the maximum pixel size the form asks for (for example 140 × 60 px for a signature) in the optional max size fields. The image keeps its proportions and fits inside that box, so it may be smaller than typed; it is never enlarged or cropped.
  • Use a plain background. Flat white areas cost almost nothing; busy backgrounds eat the size budget.

Before you upload

  • The output is always JPG, and transparent areas turn white. If the form requires PNG, this tool is not suitable.
  • The tool only enforces the 20 KB upper limit. If the form also sets a minimum size, check the file size in the result.
  • Check that the result is still readable at full size. If the tool says it cannot reach 20 KB, crop tighter and try again. More detail is in the how-to guide and FAQ.

Signature under 20 KB

Compressing a signature has its own pitfalls, such as thin lines turning grey. See the step-by-step guide to compressing a signature.

Why 20 KB is hard for photos

At 20 KB a file holds only a small fraction of the detail in a phone photo, which has millions of pixels, so the tool scales it down a lot and then looks for the best JPG quality that fits. Small, simple images do well: a tightly cropped face on a plain background or a bold signature. A wide photo with a lot going on in it will look soft however it is compressed. If the result looks too rough and your form allows more, try 50 KB instead.

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.

Why does my image look smaller after compressing?

To fit 20 KB the tool may reduce the pixel dimensions as well as the quality. It never enlarges or crops the image. If the form needs exact pixel dimensions, check the size shown in the result.

What if the tool cannot reach 20 KB?

Crop the image tighter around the subject, put it on a plain background, or enter the form's maximum pixel size so it starts smaller.

Need a different limit? Use the custom size compressor, go lower with 15 KB or 10 KB, or try 50 KB and 100 KB. Small ID photos are covered in reducing a photo for a passport upload.