File sizes use decimal units: 1 KB = 1,000 bytes and 1 MB = 1,000 KB. Your image is processed on your device.
How it works
- Choose your image.
- Type the KB limit your form or email requires, such as 100, 200 or 500.
- Select Prepare and wait for the preview.
- Check the final size and download the JPG.
Set any KB or MB limit
Use this page when your limit is not one of the standard presets. A form might ask for 150 KB, an email provider for 2 MB or a portal for a file under 350 KB. Type the number in the KB field and the tool creates a JPG that targets it. For a 2 MB limit, enter 2000, because 1 MB equals 1000 KB.
This tool controls file size, not pixels. If a form also states dimensions, such as a passport-style size in pixels, check the notice for that rule separately. The KB limit only controls how many bytes the file can use.
Shrink a large photo from MB to KB
Phone and camera photos are often measured in MB, while many forms ask for KB. Convert first, then enter the number: 1 MB is 1000 KB, and 2.5 MB is 2500 KB. The tool then reduces the photo to meet that target, which is a practical way to shrink an image from MB to KB without guessing.
If the first result is too soft, raise the limit a little and try again. If the file is still too large, lower the limit only if the form accepts the change. Each run uses your original image, so you can compare results without losing the source.
Photo resizer in KB on a phone or computer
The page runs in your browser on a phone or computer. Your image is processed on your device, never uploaded to a server, and no account is needed. The downloaded JPG has no watermark.
Sizes use decimal units, so 1 KB is 1,000 bytes. Some portals use 1,024 bytes per KB. A value that fits under the decimal limit also fits that larger convention.
Start with the largest original available, because the tool has the most detail to work with when it reduces the file.
Frequently asked questions
How do I resize an image to a specific file size?
Choose your image, enter the KB limit your form requires and select Prepare. Download the JPG once processing is complete.
How do I check the final file size?
After processing, the download shows the final size in KB. You can see the image and its file size before you save it.
How do I set a limit of about 1 MB?
Enter 1000 in the KB field. The tool uses decimal units, so 1000 KB equals 1 MB.
How do I resize an image from MB to KB?
Multiply the MB figure by 1000, because this tool uses decimal units and 1 MB equals 1000 KB. A 2.5 MB limit becomes 2500 KB. Enter that number, select Prepare and check the final size before you download.
Can I try a different limit with the same photo?
Yes. Change the number in the KB field and select Prepare again. The tool works from your selected image each time.
Can I set the width and height in pixels too?
This tool sets a file size limit in KB, not a width and height in pixels. It may reduce the dimensions if that is needed to reach the limit. For a specific pixel size, check the size-specific resizers on this site.
Will the photo lose quality when I reduce it to a KB limit?
Some detail is lost when a photo must become much smaller, because the tool lowers quality until the file meets the limit. If the result looks too soft, raise the limit a little and run it again, since each run uses your original photo.