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Compress an image to 10 KB

Ten kilobytes is the size many application forms ask for when you upload a signature.

  • 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 10 KB. We aim for 10 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 10 KB

Signature uploads on exam, scholarship and government forms, and tiny avatars on older forums.

What to expect

A signature on white paper fits easily at a readable size. A full colour photo has to become very small, around 200 pixels wide.

How big a picture fits in 10 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)180 x 120
Typical photo or headshot220 x 150
Scan, signature or screenshot of text380 x 250

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 10 KB, which is 300 B under 10 KB, so the file is not turned away over a few bytes.

Questions people ask

How do I get a signature under 10 KB?

Sign in dark ink on plain white paper, take the photo in good light, crop tight around the signature, then compress here. Plain backgrounds compress far better than shadows and paper texture.

Should I use JPEG or PNG?

JPEG, unless the form asks for PNG. A cropped signature in JPEG usually lands well under 10 KB.

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.