Postléfy
free tool

Free AI Instagram post generator

Tell us what your post is about — get a caption, hashtags and a designed image, ready to post. Free, no sign-up.

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How to use our free AI Instagram post generator

  1. Describe your post in one sentence: the product, the offer or the moment. Specific beats vague — “our single-origin pour-over is back this week” gives you better Instagram post ideas than “coffee”. Add a tone if you want one.

  2. Press Generate post. You get a caption, a short set of Instagram hashtags and a designed 4:5 image with your headline on it, all from that one sentence.

  3. Not keen on the look? Press Try another design to cycle the layout, or pick a colour — no new AI writing needed. Then copy the caption and hashtags, download the image and post.

Why a good Instagram post matters for social media growth

Instagram is a visual feed, so the image earns the stop and the caption earns the follow-through. The feed size that fills the most screen is 4:5 portrait, 1,080 × 1,350 pixels, which is exactly what this tool makes. Captions can run to 2,200 characters, but only the first line or two show before “more”, so the hook goes first.

Instagram allows up to 5 hashtags on a post (since December 2025), so pick the 3–5 that really match it — specific ones like #SourdoughSaturday beat broad ones like #food. Then post when your followers are online, because early engagement helps a post travel. The hard part is turning up week after week, and a draft you only have to tweak makes that easier.

Frequently asked questions

Is this Instagram post generator free?

Yes — it's free to use, with no sign-up and no email. Each run uses AI, so there's a fair-use limit: make a lot of posts within a minute and it will ask you to wait briefly before the next one.

Do I need to sign up?

No. Type what your post is about, press Generate post, and copy the caption and download the image. There is no account and nothing to install.

Can AI make my Instagram posts for me?

It works as an Instagram caption generator and a designer in one: a caption, hashtags and a designed image from a single sentence, as a strong first draft. Add the details only you know — a price, a date, a customer's words — before you post, and it will sound like you.

What size is an Instagram post?

The portrait 4:5 size, 1,080 × 1,350 pixels, fills the most screen in the feed, and that is the size of the image this tool makes. Square 1:1 posts and 1.91:1 landscape posts also work, but they take up less room.

How many hashtags should an Instagram post have?

Up to 5 — that's Instagram's limit since December 2025. Three to five specific hashtags work better than broad ones, and this tool gives you up to 5.

Can Postlefy post to Instagram for me automatically?

Yes. Postlefy can make posts like this in your brand's colours and logo, then publish them to Instagram and other platforms on a schedule. Sign up to try it on autopilot.

Let Postlefy post it for you.

Postlefy makes posts like this in your brand's colours and logo — and posts them to Instagram and 12 more platforms, on autopilot.

Put Instagram on autopilot — 50 free posts →

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