# ION barcode minimum sizes

Using the magnification factor on the barcode in ZPL you can generate a very small label. ION barcodes contain a json with a uid (Universal Identification) string by default that looks like this:

```
{"uid":"24daeec708d84908af9beba707a5241b"}
```

[Here's an example](http://labelary.com/viewer.html?density=12\&quality=grayscale\&width=.25\&height=.25\&units=inches\&index=0\&rotation=0\&zpl=%5EXA%0A%5EFO20%2C15%5EBQN%2C2%2C1%5EFD%7B%22uid%22%3A%2224daeec708d84908af9beba707a5241b%22%7D%5EFS%0A%5EXZ%0A) of a very small QR code (magnification of 1) that contains an ION uid. This is on a .25x.25 label size with a 300 dpi printer and there is plenty of room to spare. The basic scanner that we are using to test was still able to scan this without issue.