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

# The post composer

> How the composer is laid out and what each part does

**Where:** Calendar, **Create Post**, or click any empty slot

The composer is where nearly all of Postiz happens. It is one modal with three
columns and a footer.

## The layout

| Area       | What lives there                                                           |
| ---------- | -------------------------------------------------------------------------- |
| **Top**    | The channel picker: which channels this post goes to                       |
| **Left**   | The editor, plus a collapsible **Settings** panel for the selected channel |
| **Right**  | A live preview of the post as each selected channel will render it         |
| **Footer** | Tags, repeat, the date and time, and the publish buttons                   |

The preview column is the part people underuse. It renders the post per
platform, so a line break that collapses on one platform or a title that
truncates on another is visible before you schedule rather than after.

## The flow

<Steps>
  <Step title="Pick channels">
    Click the avatars at the top. Picking a **customer** selects all of that
    client's channels at once.
  </Step>

  <Step title="Write once">
    The **Global** tab is the default. What you write there goes to every
    selected channel. See
    [Global vs per-channel](/general/composer/global-vs-per-channel) when one
    channel needs different text.
  </Step>

  <Step title="Add media">
    Drag a file in, paste an image, or open the media library. See
    [Media](/general/composer/media).
  </Step>

  <Step title="Fill in per-channel settings">
    Some are required: YouTube needs a title, Reddit a subreddit, Pinterest a
    board. The composer will not let you save without them.
  </Step>

  <Step title="Schedule">
    Pick a time, then **Save as Draft**, **Add to calendar**, or **Post Now**.
    See [Scheduling](/general/composer/scheduling).
  </Step>
</Steps>

## Starting from a set

If you have saved [sets](/general/settings/reusables), Postiz offers them when
you open a new post. A set restores a channel selection and its settings, which
saves rebuilding the same combination every time. **Continue without set**
skips it.

## Starting from a signature

If one of your [signatures](/general/settings/reusables) is marked auto-add, it
is already in the editor when the composer opens.

## Leaving without saving

Closing the composer asks for confirmation, because nothing is kept:

> Are you sure you want to close this modal? (all data will be lost)

If a post is half-written and you need to step away, **Save as Draft** instead.
Drafts sit on the calendar and never publish.