ptools.io

Compress an Image to 20 KB

Any photo made just under 20 KB, the size the form asks for, without uploading it.

Runs entirely in your browser

Loading the tool…

Your file is opened by this page and never uploaded. It is not sent anywhere, and the page keeps working with the network off.

Choose a photo and it comes back just under 20 KB, as close to the limit as it can get, so it keeps as much quality as the size allows. The page tries the JPEG quality up and down until the file lands under the line, and shows the size it reached before you download.

Twenty kilobytes is the limit many government and exam portals set for a photo or a signature. The page opens at 800 pixels on the long edge, which is enough for a face on screen and fits under 20 KB.

Nothing is uploaded: the photo is compressed in this tab. For a photo with its background replaced for an ID or an application form, the passport photo maker makes it first.

How to use it

  1. Choose your photo. It is never uploaded.
  2. Read the size it reached, just under 20 KB.
  3. Download it. Change the target or the size if the form asks for something else.

Questions

How do I compress a photo to 20 KB?

Choose it here: the page opens on a 20 KB target and finds the highest JPEG quality that fits under it. If a large photo cannot get under 20 KB without looking poor, make it smaller in pixels with the Size option, which helps far more than quality does.

Why is my photo still too big?

Below a certain quality a JPEG stops shrinking much; the pixels are what take the space. Pick a smaller size in pixels and it will fit with room to spare. A form that asks for a small file rarely needs a large picture.

Is my photo uploaded?

No. It is compressed in this tab, on your device, by a page that is not allowed to open a network connection. Nothing is sent anywhere.

Other sizes

The same compressor, opened on another target. Any size is a slider away on each.

Your data stays on your device

Everything above runs inside your browser as WebAssembly compiled from Rust. Nothing you type is uploaded, logged or stored on a server. You can load this page once, go offline, and it still works.

This page makes no requests at all, to anywhere. That is not a promise in the copy: it is a Content-Security-Policy header your browser enforces, and connect-src on it is none. Open the network tab and watch nothing happen.