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Compress an image to 20 KB

Twenty kilobytes is a common ceiling for passport style photos on exam and recruitment forms.

  • Nothing is uploaded. Your browser does the compression, so the file stays on your device.
  • Lands under the real limit. We aim a little below it, so the upload goes through first time.
  • Fast. A 30 second 1080p clip fits into 10 MB in about two seconds on a desktop.
Where are you sending it?

Custom size 20 KB. We aim for 19 KB, a small safety margin so the file never lands just over.

Sent to our servers: 0 bytes. It all happens in this tab.

When you need 20 KB

Exam registrations, recruitment portals and scholarship forms often want a photo between 20 and 50 KB and a signature between 10 and 20 KB. Check the exact range on your form.

What to expect

A cropped head and shoulders photo stays clear at about 300 to 400 pixels wide. If the form gives a minimum as well as a maximum, use the custom size box and aim just under the maximum.

How big a picture fits in 20 KB

Rough pixel sizes at good quality. The tool checks the real result, so treat these as a guide.

What it isAbout this many pixels
Detailed photo (landscape, crowd)250 x 170
Typical photo or headshot310 x 210
Scan, signature or screenshot of text540 x 360

How we hit the number

We try the highest quality that fits. If the picture still will not fit even at a lower quality, we reduce the pixel size a step at a time until it does. Photos are saved as JPEG by default, which every form accepts. You can switch to WebP or PNG with the format menu.

The target we aim for is 19 KB, which is 600 B under 20 KB, so the file is not turned away over a few bytes.

Questions people ask

My form says between 20 KB and 50 KB. What should I pick?

Pick the 50 KB page, or type a custom size of about 45 KB. Results just under the maximum look best and stay above the minimum.

Will the face still be clear?

Yes for a cropped headshot. Crop to the head and shoulders first so the bytes go to the face rather than the background.

Related

Limits change. We link the official page wherever there is one, and the safety margin means a small change is unlikely to matter. Last updated 2026-11-09.