AI writing

Get help with the words while you put a post together, in your own style. Every text field in the upload flow has an AI button, for videos, images, carousels and text posts, and one button fills every empty field at once. AI writes into the fields for you to check and edit; nothing is ever published without you.

Write one field

  1. Click AI under a text field.
  2. Optionally add an instruction, such as "more playful" or "mention the launch on Friday".
  3. If the field is empty, click Generate. If it has text, choose Improve, Shorten or Rewrite.
  4. The text goes straight into the field, where you can keep editing it. Try again writes a new version and Undo puts back what was there.

Fill every field at once

The AI button at the top of the caption and settings steps, next to Save defaults, fills every empty field on the step: the caption first, then titles, descriptions, tags, alt text and comments built on it. Fields that already have text stay as they are, and Undo all clears what AI wrote. Tell it what the post is about if there's no media or text to go on yet.

If you try to continue without a caption, the reminder offers Write with AI to fill it for you.

Your style

AI reads a few of your recently published posts and writes new ones to sound like them: the same tone, length, emoji and hashtag habits, and sign-off. It never copies their facts into a new post.

The first time you use AI writing in a workspace, it also drafts a short style note from your posts, such as "friendly, two short lines, one emoji". Open Edit your style in any AI panel to change it, write your own, or draft it again. The style is shared by everyone in the workspace, and saving it is free.

Where you can use it

  • Captions: the shared caption, caption groups and custom captions per platform
  • Titles, descriptions and tags
  • First comments and follow-up comments
  • Instagram and Pinterest alt text
  • Poll questions, Discord forum titles, LinkedIn document titles and Pixelfed content warnings

What it pays attention to

  • Limits: suggestions fit the character limit of every platform the field goes to. A shared caption for X and Instagram stays within X's limit, so use a custom caption when you want more room on one platform.
  • Hashtags: a few relevant ones where they help, and none on platforms that don't use them, like Reddit and Google Business Profile.
  • Your post: AI reads what you typed in the post's other fields, so a title can build on your caption.
  • Mentions and links: they stay as you wrote them.

Alt text and images

To write alt text, AI looks at the image itself. For a carousel, each image gets its own description. If the image isn't available yet, wait for it to finish uploading, or write a short description yourself and use Improve.

Generate on other fields also looks at your image, or one frame of your video, so it has something to go on when the post has no text yet. For a text post with nothing filled in, add an instruction saying what the post is about.

Plans and limits

AI writing is on every plan. The Free plan includes 10 uses a month to try it, the Creator plan 500 and the Team plan 2,500, shared by everyone in your organization across its workspaces.

Each field AI writes counts as one use, including Try again, so filling five fields at once uses five. Drafting your style from your posts uses one, and the automatic first draft is free. A request that fails doesn't count. The number left shows in every AI panel, and uses reset on the first of each month (UTC).

Your content

When AI writes, the field's text, your instruction, the post's other text fields, your style note, a few of your recent published posts and, where needed, the image or video frame are sent to Anthropic, which runs the Claude model behind this feature. Anthropic doesn't train its models on it. ShortSync doesn't keep this text in its logs or analytics; what AI writes is saved only as part of your post, and your style note in your workspace settings. See the privacy policy for details.

AI can get details wrong, so read what it wrote before you post it.