> ## Documentation Index
> Fetch the complete documentation index at: https://docs.intelliprint.net/llms.txt
> Use this file to discover all available pages before exploring further.

# Envelope and Postcard Sizes

> You can send out your mail items in a variety of letter envelopes and postcard sizes.

## Setting the Envelope or Postcard Size for a Print Job

<CodeGroup>
  ```javascript Node.js SDK theme={null}
  import Intelliprint from 'intelliprint'

  const ip = new Intelliprint('your-api-key-here')

  const printJob = await ip.prints.create({
    postage: { // [!code ++]
      ideal_envelope: 'c5' // c5, c4, c4_plus, a4_box, postcard_a6, postcard_a5, postcard_a5_enveloped [!code ++]
    }, // [!code ++]
    // ...Other properties.
  })
  ```

  ```bash cURL theme={null}
  curl -X POST https://api.intelliprint.net/v1/prints \
    -H 'Authorization: YOUR_API_KEY' \
    -d 'postage[ideal_envelope]=c5' \
  # Provide the other properties of the print job.
  ```
</CodeGroup>

## Available Letter Envelope and Postcard Sizes

#### Letter Envelope Sizes

| Size     | Maximum Sheets                 | Compatible Postage Services |
| -------- | ------------------------------ | --------------------------- |
| c5       | 15 (Sheets are folded in half) | All except Tracked 24 & 48  |
| c4       | 50                             | All                         |
| c4\_plus | 250                            | All                         |
| a4\_box  | 1,800                          | All                         |

<Tip>
  When a letter in a print job uses more sheets than the provided `postage.ideal_envelope` can hold, the envelope for that letter is automatically upgraded to an envelope that can contain the letter.
</Tip>

#### Postcard Sizes

| Size                    | Dimensions   |
| ----------------------- | ------------ |
| postcard\_a6            | 105 x 148 mm |
| postcard\_a5            | 148 x 210 mm |
| postcard\_a5\_enveloped | 148 x 210 mm |