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The composer is where you write content for one or more channels at once. Beyond the basic text editor it supports per-channel content, per-platform previews, threads, and first comments.

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Global vs. per-channel content

By default the composer uses a global body shared by every selected channel. Switch to per-channel mode to write a different body for each platform - useful when platforms have different tone or formatting norms.

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Per-platform preview

As you type, the composer renders a live preview matching each target platform’s layout. Preview families cover microblogs, video, Instagram, LinkedIn, Facebook, articles, email, and community posts, so you can catch layout issues before scheduling.

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Provider settings

Some providers accept per-channel settings beyond the text - for example image counts or platform-specific options. These appear in the composer when you select the channel and are validated before publishing.

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Threads

A thread is a series of linked posts published together. In the composer, add thread parts below the main body; each part is rendered as its own post and grouped together. Thread parts can also be provided through the CSV import (thread column) and are grouped with the main post.

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First comment

Optionally set a first comment that PostSider publishes right after the main post, where the platform supports it. Instagram creators commonly use this for hashtags. The first comment is published best-effort by the publishing workflow; Threads requires the threads_manage_replies scope. You can also supply it via the public API (posts[].firstComment) or the CSV import (first_comment column).

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Reusable content

Use the composer helpers panel to insert saved hashtag groups, caption templates, and UTM presets.