Question: [This example](https://tcpdf.org/examples/example_028/) on tcpdf's website shows how to use page formats like A4, A5 etc, but how do I set tcpdf to use custom sizes like 175mm x 266 mm?

Solutions appreciated.

Answer: 
No editing of the class is require... tcpdf doesn't accept a width/length parameter, it just accepts two lengths and determines which is which using the layout (either Portrait or Landscape)

```
$pageLayout = array($width, $height); //  or array($height, $width) 
$pdf = new TCPDF('p', 'pt', $pageLayout, true, 'UTF-8', false);

```
Go to /config/tcpdf\_config.php and around line 117, modify the line:

```
define ('PDF_PAGE_FORMAT', 'A4');

```

by

```
define ('PDF_PAGE_FORMAT', 'LETTER');

```

It is important to put "LETTER" in uppercase, you can see all possible values in this file: `tcpdf/include/tcpdf_static.php`.