Reduce image size in KB
Online forms for exams, jobs, scholarships and government services often reject a photo or signature that is over a size limit in KB. Pick the limit, add your image, and get a JPG under it, as sharp as that size allows. It all happens in your browser, so nothing is uploaded.
Everything runs on your device. Nothing you add or type is sent to any server.
How to use it
- 01
Choose the size limit from your form: 20, 50, 100, 200 or 500 KB, or tap Custom and type any number.
- 02
If the form also gives pixel dimensions, open Pixel size and enter them. Otherwise leave it empty.
- 03
Add your photo or signature. The tool starts right away and aims for a JPG just under the limit; check the preview and size, then press Download JPG.
How it reaches your size
The tool tries different JPG quality levels, quickly narrowing down to the highest quality that still fits under your limit. If the picture is very large, it also makes it smaller in pixels first, because a smaller clear image looks much better than a blurry, blocky large one. You see the final size, the pixel dimensions and the quality used.
To be safe on every website, the tool counts 1 KB as 1000 bytes. Some sites count 1024 bytes, but a file under 50,000 bytes is under 50 KB either way.
When the limit is too small
If you enter fixed pixel dimensions, the tool keeps them and only lowers the quality. Very small limits with large dimensions can be impossible without ruining the image. In that case the tool tells you clearly and offers the smallest file it could make, so you can decide whether to use smaller dimensions.
For a signature, crop away the empty paper first with our Crop Image tool, and use dark ink on white paper. A tight crop needs far fewer bytes than a full page.
Frequently asked questions
What format is the result?
Always JPG, which almost every form accepts. Transparent areas become white. If your JPG is already under the limit and you did not ask for new dimensions, the original file is kept as it is.
Can I use an iPhone HEIC photo?
Yes. HEIC, PNG, WebP and JPG photos all work, and the result is a JPG.
My form says the photo must be between 20 KB and 50 KB.
Choose 50 KB. The tool aims just under the upper limit. A small or simple image, such as a signature, can still come out below 20 KB, so check the size shown before you upload.
Is my photo uploaded?
No. The image is processed by your own browser and never leaves your device.