---
title: Introduction to optimizing newsletters for mobile devices
slug: campaign/docs/introduction-to-optimizing-newsletters-for-mobile-devices
docTags: 
createdAt: 2026-07-20T15:45:04.432Z
---

The Optimizely [Template Kit](docId\:jRJZaVEfgoLqt9ai1hzyD) is optionally available with [Mobile Fusion](docId\:LSqRYka4YUObXG4A11tQL), which applies the Template Kit's flexibility to the mobile version of your newsletters. This section helps you design mobile newsletters and integrate them into the mobile version of your mailings.

![Image: Mobile versions of a mailing](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/qjfYW0KrvGfzBm7YZNDwI-20260720-145506.png "Image: Mobile versions of a mailing")

## Prerequisites

- If you have not installed Mobile Fusion or are not currently using the Template Kit, contact [customer support](docId\:ZWe1T3UPz3JW6_4mc76qV) to get Mobile Fusion with the Template kit.
- [Template Kit](docId\:jRJZaVEfgoLqt9ai1hzyD) describes paragraphs, setup and configuration of the Template Kit, including mobile options.
- [Mobile Fusion](docId\:LSqRYka4YUObXG4A11tQL) describes design options for the mobile layout of newsletters.

## What does the Template Kit with Mobile Fusion offer?

- **Enable or disable mobile version**. If you enable the mobile version, Optimizely Campaign automatically generates a version of your mailing optimized for mobile devices; this increases the size of each emailing. See [General settings](docId:_tFz-uO3tstT14z9bsx80).
- **Place the sidebar above/below the main body**. In each paragraph, you can indicate whether to display the sidebar (if present) before or after the main body. See [Grouping paragraphs](docId\:qsnzhDQaoiNvF1uwXSaBR).
- **Hide/display paragraphs in the mobile version**. You can indicate, by paragraph, whether to integrate that paragraph into the mobile version. You can also indicate if a paragraph should appear in the mobile version only. See [Content paragraphs](docId\:k_xGTdqfbFMswnhvAOVaV).
- **Set paragraph width in the mobile version**. You can set the width of each paragraph (in %) for mobile display. See [Content paragraphs](docId\:k_xGTdqfbFMswnhvAOVaV).
- **Set the width of paragraph separation in the mobile version**. You can set the width of the paragraph separators (in %) in the general settings for the template. See [General settings](docId:_tFz-uO3tstT14z9bsx80).