Social media post generator: turn one idea into a post for the platform you pick.

Enter a topic, or paste a paragraph from something you have already published, and choose X, LinkedIn or Instagram. The tool writes posts shaped for that platform. Edit them before you post.

By · Updated September 25, 2026

Social media post generator

Runs on our server. Your text is sent to Anthropic's Claude to write the result. We count runs and never save what you enter; an identical request may be answered from memory for up to five minutes.

What you can do with it

  • Repurpose a published article into posts that point back to it
  • Adapt one announcement for X, LinkedIn and Instagram without writing it three times
  • Draft a LinkedIn post from a paragraph of a case study
  • Get a first version when you know what to say but not how to open it

How it works, step by step

  1. 1

    Start from something you have already published

    The easiest social posts come from work that exists: an article, a case study, a talk. Pick one idea from it, not a summary of the whole thing.

  2. 2

    Write the opening line first

    Feeds show only the first line or two before a post is cut off behind a see more link. Put the point, the surprising detail or the question there, not a warm-up.

  3. 3

    Fit the platform

    Posts on X are short; standard accounts have a 280-character limit. LinkedIn rewards a few short paragraphs with one idea. Instagram carries the message in the image and uses the caption to add context.

  4. 4

    Place the link where it works

    On X and LinkedIn you can put a link in the post. Instagram captions do not make links clickable, so point people to the link in your profile or a story instead.

  5. 5

    Edit into your own voice and post

    Read the draft aloud. Cut anything you would not say in person, add a specific detail only you know, and then post. Watch which posts get replies, not just likes.

Repurpose before you invent

Most people who post regularly do not come up with something new every day. They take work they have already done, an article, a customer story, a lesson from a project, and pull single ideas out of it. One good article can hold several posts: the main finding, a surprising number from your own data, a mistake you made, a question it answers.

This is also the honest way to use a post generator. Paste a paragraph from something you have published and let the tool shape it for the platform. The substance is yours. The tool helps with the format.

One idea per post

A post that tries to summarize a whole article reads like a table of contents. Pick one idea and give it room. If the article has five points, that is five posts over a few weeks, not one post with five bullets. Readers scroll past lists of claims. They stop for one specific thing, said plainly.

The first lines carry the post

Every major feed truncates posts after the first line or two, then shows a “see more” link. Most people never click it. That means the opening has to work on its own:

  • Lead with the point or the most specific detail, not with context.
  • Cut openers like “I’ve been thinking a lot about…” that delay the substance.
  • Ask a question only if you want answers to it.

Each platform has its own shape

  • X. Standard accounts can post up to 280 characters. One sharp statement, a link if it helps. Longer thoughts can go in a thread, but the first post has to stand alone.
  • LinkedIn. Short paragraphs, plain language, one idea developed a little. Links work, though many people put the link in the post body near the end so the opening stays about the idea.
  • Instagram. The image or video does the work. The caption adds context, and links in captions are not clickable, so direct people to the link in your profile.

Edit before you post

A generated post is a draft. It will be plausible and generic, because the model does not know your audience, your past posts or how you speak. Add one detail only you could know, remove any phrase you would never say out loud, and check the facts. For pulling the key point out of a long piece first, the article summarizer helps.

Posts work best when they point to something worth reading. AltoRank plans and drafts that content for a site every week, and a person approves each piece before it publishes.

Frequently asked questions

Which platforms does it write for?

X, LinkedIn and Instagram. You choose one per run, and the tool shapes the length, structure and tone for that platform. To cover all three, run it three times with the same input.

Can I paste a whole article?

You can paste a passage of up to 5,000 characters. A single section or a key paragraph usually gives a better post than a whole article, because a good post carries one idea.

Will the posts fit the character limit?

They are written for the platform you choose, and for X they aim to be short. Standard X accounts have a 280-character limit, so count the characters of the version you post, especially after you edit it.

Does it post for me or make images?

No. It writes text only. It does not connect to your accounts, schedule posts or create images, so mentions, visuals and the final check are yours.

What happens to what I enter?

Your topic or text goes to our server and on to Anthropic's Claude, a fast model, which writes the posts. We count how many times the tool runs and never save what you enter; an identical request may be answered from memory for up to five minutes. There is a daily usage limit so the tool can stay free without a signup.

More free tools

Be the site the assistant names.

Add a domain and the first draft is written while you watch. Every publish is your decision, a click on the draft or a rule you set and can hold, and you can read the source or self-host it free.

Set up your site and read your first drafts before you enter a card.