# Limitations

There are a few limitations to .px files

### Canvas size

Depending on the available memory (RAM) that our devices have, the canvas size will be limited as the following:

* Less than 1.5 GB - 800 x 800
* 1.5 GB to 2.5 GB - 1200 x 1200
* 2.5 GB to 3.5 GB - 1500 x 1500
* 3.5 GB to 4.5 GB - 1800 x 1800
* 4.5 GB to 6.5 GB - 2000 x 2000
* 6.5 GB to 8.5 GB - 2500 x 2500
* More than 8.5 GB - 3000 x 3000

### Number of cels

The number of cels is the product of the number of layers multiplied by the number of frames. Similar to [canvas size limitation](#canvas-size), this will be determined by the available memory of our devices.

The number is not a specific number like canvas size, but if you're curious, here is the equation:

```
canvas width * canvas size * 4 * number of layers * number of frames < 10% of RAM in bytes
```

After reaching this limit, we will see the add frame or add layer button being greyed out.