Convert Image from MB to KB

Turn an image that is a few MB into one that is a few hundred KB.

or drop an image anywhere on this page

JPEG, PNG or WebP · up to 50 MB

Files never leave your device
Free, no sign-up
No watermark

How to use this tool

Choose a JPEG, PNG or WebP file, or drag it onto the drop area.
Check the target size (currently 500 KB). It is editable, so change the number or the KB/MB unit if your limit differs.
Press the button. The tool lowers the quality first, then reduces the dimensions step by step if the file is still too large.
Compare the preview and the measured output size with the original, and read any notes or warnings.
Download the new file. If it missed the target, adjust the target slightly or crop the original, and try again.

What to know before you convert Image from MB to KB

Converting from MB to KB means two things, and this page does both. First, the unit: 1 MB is 1,024 KB, so 1 MB is 1,024 KB, 2 MB is 2,048 KB and 0.5 MB is 512 KB. Some systems count 1 MB as 1,000 KB instead, which is why a file can look slightly bigger or smaller depending on the program that shows it. Second, the file itself: if a form needs 500 KB and your photo is 4 MB, the photo has to lose roughly nine tenths of its data. The tool achieves that by lowering the JPEG quality and, if needed, reducing the dimensions, and it measures the real result so you can see whether it fits. A photograph from a recent phone has far more pixels than a form field ever shows, so it normally survives a large reduction well. Heavily detailed pictures lose more.

A megabyte is 1,024 kilobytes, so a 2 MB photo is about 2,048 KB. Getting it down to 500 KB means keeping roughly a quarter of the data. The size you enter is a goal, not a promise: the result depends on the original image, its dimensions, its complexity, its format and your browser's encoder, and the tool reports the real size instead of assuming it.

Recommended settings and supported formats

The tool starts at 500 KB. Change it to the figure on your form. For scanned documents with text, keep a higher limit (200 KB or more) so the writing stays readable.

Accepted input: JPEG, PNG and WebP (WebP depends on your browser). HEIC and AVIF are not supported. PNG is lossless, so it can only get smaller with fewer pixels unless you choose JPEG or WebP output.

Practical uses

Uploading a camera photo to a form that wants a few hundred KB
Shrinking a scan before emailing it
Checking how small a photo can get before it looks bad

Tips for a smaller file

Remember 1 MB = 1,024 KB when you compare the original with the result.
Work from the original photo, not a copy that has already been reduced.
If the text in a scan looks fuzzy, raise the KB target.

Frequently asked questions

How many KB is 1 MB?

1 MB is 1,024 KB in the units this tool uses. Some systems use 1,000 KB, so the numbers can differ a little between programs.

How do I get a 3 MB photo under 500 KB?

Enter 500 as the KB target and start. The tool lowers quality and, if needed, dimensions, and then shows the real size.

Is the image uploaded?

No. Everything happens in your browser.

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Privacy

Your image is processed entirely in your browser using your own device. It is not uploaded to Paul Digital or any other server, and nothing is stored once you close the page.