The tool runs a binary search over JPEG quality levels (1–95) to find the highest quality that produces a file at or below your target size. If even quality 1 is too large, the image dimensions are automatically scaled down until the target is reachable.

Why is the output always a JPG?

JPEG is the only format that supports quality-based compression, which makes it possible to precisely target a file size. PNG is lossless and its file size cannot be directly controlled this way.

Will the result always be at or below my target?

Yes. The tool guarantees the output is at or below the target. If the image needs to be downscaled to reach a very small target, a notice is shown.

What forms require 20 KB or 50 KB images?

Many government portals, university admission forms, exam registration systems, and visa applications in Bangladesh, India, and other countries require photos or scanned documents below 20 KB or 50 KB. This tool is built specifically for those use cases.

Can I set any KB value?

Yes. The presets cover the most common requirements but you can type any value in the custom field. The tool will try to hit any target from 1 KB upward.

The tool runs a binary search over JPEG quality levels (1–95) to find the highest quality that produces a file at or below your target size. If even quality 1 is too large, the image dimensions are automatically scaled down until the target is reachable.

Why is the output always a JPG?

JPEG is the only format that supports quality-based compression, which makes it possible to precisely target a file size. PNG is lossless and its file size cannot be directly controlled this way.

Will the result always be at or below my target?

Yes. The tool guarantees the output is at or below the target. If the image needs to be downscaled to reach a very small target, a notice is shown.

What forms require 20 KB or 50 KB images?

Many government portals, university admission forms, exam registration systems, and visa applications in Bangladesh, India, and other countries require photos or scanned documents below 20 KB or 50 KB. This tool is built specifically for those use cases.

Can I set any KB value?

Yes. The presets cover the most common requirements but you can type any value in the custom field. The tool will try to hit any target from 1 KB upward.

Resize Image to Exact KB — Free Online

How to use Resize Image to Exact KB

1
Upload your image
Drop a JPG, PNG, or WebP image onto the tool.
2
Choose a target size
Select a preset - 20 KB, 50 KB, 100 KB, or 200 KB - or type any custom KB value.
3
Download
The tool automatically finds the best quality setting to reach your target. Download the result as a JPG.

Why online forms require exact file sizes

Many government portals, university application forms, exam registrations, and visa applications specify a maximum file size in kilobytes. The limits are strict - a file that is 101 KB will be rejected by a form that requires 100 KB or less. Standard image compression tools give you a quality slider but not a precise size output, which means you keep adjusting and re-checking until you happen to land on the right number.

This tool solves that problem directly. Enter the target size, and the tool runs a binary search over JPEG quality levels to find the highest quality that produces a file at or below your target. The result is always within the limit, and the quality is as high as the constraint allows.

Common size requirements

20 KB is a common maximum for passport photos on South Asian government portals. 50 KB is typical for signature images and document scans on exam and university forms. 100–200 KB is the range for general photos submitted to online application systems. All four are available as one-click presets, and any other value can be typed directly into the input.

If your form requires both a specific pixel size and a maximum file size, the signature resizer combines both into a single step - useful for exam portals that specify dimensions like 300×80 px at under 20 KB. For a broader approach to reducing file size without a strict KB target, compress image gives you a quality slider with live before/after size comparison.

Frequently Asked Questions

Related Tools

Compress Image

Compress JPG, PNG, WebP and GIF images

Compress JPG

Reduce JPG file size without visible quality loss

Passport Photo Maker

Create passport-size photos with exact dimensions and white or blue background

Signature Resizer

Resize signature images to exact pixel dimensions and file size for online exam, job, and bank forms