---
title: "/campaigns/:id/content"
method: PUT
path: "/campaigns/{id}/content"
---

# /campaigns/:id/content

`PUT /campaigns/{id}/content`

## Request

- Base URL: `https://api.mailerlite.com/api/v2`
- URL: `https://api.mailerlite.com/api/v2/campaigns/{id}/content`
- Auth: API key in header `X-MailerLite-ApiKey`

Upload your HTML template to created campaign [Rate limited]

## Path parameters

- `id` integer, required

## Request body

- object
  - `html` string, required: HTML template source (must contain head and body tags)
  - `plain` string, required: Plain text of email
  - `auto_inline` boolean: Defines if it is needed to convert available CSS to inline CSS (excluding media queries)

## Response `200`

200

- object
  - `success` boolean

## Other responses

- `422`: 422

## Changes

- **2026-11-03** `6f921caf37b1`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/mailerlite/apis/v2-production/changes/campaigns/:id/content/put.md)

---

[API](https://skmtc.dev/mailerlite/apis/v2-production.md) - [All operations](https://skmtc.dev/mailerlite/apis/v2-production/llms.txt) - [OpenAPI document](https://skmtc.dev/mailerlite/apis/v2-production/revisions/6f921caf37b1?raw)