Home · Image Resizer (KB)

Resize Image to Target KB

100% Private — No Upload Required

Need an image under exactly 100 KB for a form upload? Set the target size below and we'll find the right quality automatically — all in your browser.

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Drop an image here

JPG, PNG, WEBP · max 10 MB · output is JPEG

Why resize an image to a specific KB?

Many official forms — government applications, exam registrations, passport portals — enforce strict file-size limits. Most basic compressors give you a quality slider but no way to hit an exact size. This tool runs a binary search over JPEG quality (and downscales as a fallback) to land within ~1 KB of your target.

How it works

  1. Upload your image and enter the target size in kilobytes.
  2. The browser tries several quality levels and picks the highest-quality version that fits.
  3. If the target is impossible at full resolution, the image is automatically downscaled.

How exact-KB resizing works

This tool uses binary-search compression to hit a target file size (in KB) precisely. It tries quality 90% first, measures the resulting file size, and adjusts up or down until the size is within 2 KB of your target. If quality 10% is still too large, the tool progressively downscales the image dimensions by 5% per iteration until the target is reachable. The result: you get the highest possible visual quality at your exact byte budget.

Common Indian use cases for exact-KB resizing

Why exact KB matters for online forms

Most Indian government and exam portals reject uploads even slightly over the size limit. Their systems typically check exact byte size, so a 51-KB photo to a 50-KB form fails immediately. Compressing too aggressively the other way produces artefacts visible to any human reviewer. Hitting the limit precisely — say 48-49 KB for a 50 KB max — gives you the best photo your portal will accept. This tool is built specifically for that.

JPEG vs PNG vs WebP for size targets

For photos and ID-style images, JPEG always reaches the smallest size. For screenshots or graphics with text, PNG sometimes beats JPEG at high quality but rarely at sizes under 100 KB. For most "fit under X KB" tasks, JPEG is the right answer. WebP gets 25-35% smaller still but isn't universally accepted by Indian government portals — stick to JPEG when a portal asks for an image upload.

Disclaimer

Aggressive compression at very small target sizes (under 20 KB for a typical photo) will produce visible quality loss. If your target portal accepts a larger size, use it. Always preview the compressed result before submission to confirm the photo is still recognisable.

FAQ

What's the smallest target I can set?

5 KB. Below that, even a heavily downscaled JPEG won't be recognisable.

Can the output be PNG?

The output is JPEG because precise file-size targeting works best with JPEG quality. PNG file size is dominated by content complexity, not a quality knob.

Frequently asked questions

What if my target size is too small to reach?

The tool will downscale image dimensions automatically to hit the target. If even the smallest dimensions can't reach the target, you'll see an error — pick a larger target.

Can I resize PNG images to a target KB?

Yes, but PNG compression is lossless and limited. For aggressive size targets, the tool will offer to convert to JPEG (lossy compression) which can hit much smaller sizes.

Why is my output slightly different from my target?

The tool aims for within 2 KB of your target due to the binary search method. If you need exact byte-precision, that's typically impossible — JPEG file sizes are determined by the compression process and cannot be set exactly.

Will the image quality be acceptable at very small sizes?

For typical photos and 10-50 KB target sizes, yes. Below 10 KB, expect visible artefacts. The tool shows a preview before download so you can verify.