# Shipping label sizes

Use this guide to learn how to use the Shippo API to create different label sizes for your application.

## Setting your label format

Specify your preferred label format by setting the `label_file_type` parameter to one of the [label tokens](#shipping-label-format-sizes) when calling the [transaction endpoint](/shippoapi/public-api/transactions/createtransaction) to purchase your label.

Each carrier supports different label size options. Refer to our [carrier capabilities](/docs/carriers/carriercapabilities) for carrier specific details.

If you don't set the `label_file_type`, the Shippo API will use the default format set in the [Shippo dashboard](https://apps.goshippo.com/settings/labels).


```shell
curl --location --request POST 'https://api.goshippo.com/transactions' \
--header 'Authorization: ShippoToken <API_TOKEN>' \
--header 'Content-Type: application/json' \
--data-raw '{
  "rate": "a5c9d1bec93149f5bedc3a9374b50970",
  "async": false,
  "label_file_type": "PDF"
}'
```

## Shipping label format sizes

| Label type | Dimensions (imperial) | Dimensions (metric) | Token |
|  --- | --- | --- | --- |
| 2.3 x 7.5 inch PDF | 2.3 x 7.5 inch | 59 x 191 mm | `PDF_2.3x7.5` |
| 2.3 x 7.5 inch PNG | 2.3 x 7.5 inch | 59 x 191 mm | `PNG_2.3x7.5` |
| 4 x 8 inch PDF | 4 x 8 inch | 100 x 200 mm | `PDF_4x8` |
| 4×6 inch PDF | 4 x 6 inch | 102 x 153 mm | `PDF_4x6` |
| 8.5×11 inch PDF | 8.5 x 11 inch | 210 x 279 mm | `PDF` |
| A4 PDF | 8.3 x 11.7 inch | 210 x 297 mm | `PDF_A4` |
| A5 PDF | 5.8 x 8.3 inch | 148 x 210 mm | `PDF_A5` |
| A6 PDF | 4.1 x 5.8 inch | 105 x 148 mm | `PDF_A6` |
| ZPL II |  |  | `ZPLII` |
| PNG |  |  | `PNG` |