You can make a complete post, caption plus image, with a free AI social media post generator in about the time it takes to make tea. The trick is that no single free tool does everything well. You write the caption with a free AI writer, make the image from a template or a free AI image tool, then schedule it. This guide walks through that in six steps, with prompts you can copy.
So which free AI social media post generator with images should you use? For captions, GoBrandIt Free gives you 50 AI credits a month and Buffer Free includes its AI Assistant. For images, Adobe Express Free offers free daily AI generations, and ChatGPT's free tier includes limited image creation. If you'd rather start from a design than a blank prompt, GoBrandIt's Social Designer has 300+ templates on the free plan. One thing to be clear about: AI image generation in GoBrandIt starts on the Creator plan, not Free.
The short version
A free AI post takes two tools at most: one for the caption, one for the image.
Templates beat raw AI images for anything with your logo, prices or text on it.
Give the AI a real brief: product, audience, offer, call to action.
GoBrandIt Free covers captions, templates and scheduling; AI images need Creator ($4.99 a month).
What a free AI social media post generator can and can't do
Free AI tools are good at three things: a first-draft caption, a rewrite for each network, and a background image or illustration. They're bad at text inside images, exact product shots and anything that needs to look like your actual shop. AI can't photograph your momo platter. It can write a caption for the photo you took.
That's why the best free workflow mixes AI with templates. Use AI where it's fast and a template where accuracy matters, like a price, a date, or your logo.
Free AI tools for captions and images, compared
We checked each free plan on the company's own site on 13 October 2026. Not listed means we couldn't find it on their free plan.
Tool
Free captions
Free images
Schedules posts
GoBrandIt Free
50 AI credits a month
300+ templates, no AI images
Yes, 3 accounts
Buffer Free
AI Assistant, unlimited
Not listed
Yes, 3 channels
Adobe Express Free
Not listed
Free daily AI generations
Yes, 1 account per network
ChatGPT Free
Yes
Limited image creation
No
Metricool Free
5 AI credits a month
Not listed
Yes, 20 posts a month
Predis.ai
3-day trial only
3-day trial only
Paid plans
Adobe Express is the one free tool here that does images and scheduling in the same place; its pricing page lists free daily generations and a scheduler for one account per network. GoBrandIt and Buffer are stronger on captions and scheduling. Predis.ai makes both captions and visuals, but only as a short trial before a paid plan.
How to make a post with an AI social media post generator, step by step
We'll use a real-looking example: a Pokhara lakeside hotel promoting a weekday rate.
Step 1: Write a four-line brief
AI writes generic copy when you give it a generic request. Before you open any tool, jot down:
What: 20% off weekday stays in November.
Who: couples and remote workers from Kathmandu.
Why now: clear mountain views after the monsoon.
Action: book through the link in bio, or call.
Step 2: Generate three caption options
Paste the brief into your AI writer and ask for three options in different tones. In GoBrandIt, the AI assistant writes in your saved Brand Voice, so you don't have to describe your tone every time. Pick the best one and rewrite the first line yourself.
Step 3: Adapt it for each network
An Instagram caption won't fit X, and a LinkedIn post needs a different angle. Ask the AI to shorten or reframe it, or use "Adapt with AI" in GoBrandIt's composer, which rewrites the post per network. Our character limits table shows the limits to stay under.
Step 4: Make the image
You have two routes. For anything with text, prices or your logo, start from a template: open Social Designer, pick a size such as square or Story, and swap in your photo and offer. For a mood image without text, use a free AI image tool and describe the scene in detail.
Step 5: Add alt text and hashtags
Ask the AI for one sentence of alt text describing the image, plus 5 to 8 hashtags that a real person would search. Delete any that are vague or huge.
Step 6: Schedule it
Upload the image, paste each network's caption and schedule it for when your audience is online. If you designed in Canva, our guide to scheduling Canva posts covers the handoff.
Tip
Make the image before you finalize the caption. Seeing the picture often changes what the first line should say.
Prompt examples you can copy
Swap the details in brackets for your own. Specifics are what make the output usable.
Caption prompts
Write 3 Instagram captions for [a lakeside hotel in Pokhara] offering [20% off weekday stays in November] to [couples and remote workers]. Tones: warm, playful, direct. Under 60 words each. End with [book via link in bio].
Rewrite this caption for LinkedIn, aimed at [remote workers], focusing on [quiet rooms and fast Wi-Fi]. Keep it under 100 words: [paste caption].
Give me 5 opening lines for a post about [our new Tihar sweets box]. Each under 10 words.
Image prompts
A calm hotel balcony at sunrise overlooking a lake, snow mountains in the distance, two coffee cups on a wooden table, soft natural light, square format, no text.
Flat-lay of colourful festival sweets in a gift box on a marigold background, top-down view, bright daylight, portrait format, empty space at the top for a headline.
Here's the kind of caption the first prompt gives you after a quick edit: November in Pokhara hits different. Clear peaks, quiet lake, and 20% off weekday stays! Bring your laptop or don't. Book through the link in bio.
For more starting points, see our list of social media post ideas.
Template or AI image: which should you use?
Pick based on what the post has to show.
Use a template for offers, prices, event dates, quotes, menus, announcements and anything with your logo. Text inside AI images is still unreliable.
Use an AI image for mood shots, backgrounds, illustrations and seasonal themes where exact details don't matter.
Use your own photo for your product, your team and your space. Customers trust real photos, and AI can't fake your actual dining room.
Combine them: an AI background with your real photo and text placed on top in a template.
Doing it all in GoBrandIt
On GoBrandIt Free you can write captions with 50 AI credits a month in your Brand Voice, design the image in Social Designer from 300+ templates with your Brand Kit, use Canva designs, then schedule to 3 accounts. A short caption costs less than one credit, so 50 goes a long way for a small business. What Free doesn't include is AI image generation or AI photo edits like background removal.
Those start on Creator, at $4.99 a month or $50 a year, with 300 AI credits a month. Credits refill on the 1st, and if you run out you can buy a pack that never expires. See what the AI content assistant covers, or compare plans on our pricing page.
Make your first AI post free
Sign up for GoBrandIt Free, set your Brand Voice, pick a template and schedule your first post. No card needed.
Frequently asked questions
Is there a free AI social media post generator with images?
Yes, if you combine tools. Use a free AI writer for the caption and Adobe Express Free or ChatGPT's free tier for an AI image, or start from free templates like GoBrandIt's Social Designer.
Can AI make a full social media post for free?
It can draft the caption, hashtags and alt text, and free image tools can make a background or illustration. You'll still want to edit the caption and add real photos for products.
Does GoBrandIt's free plan include AI images?
No. Free includes 50 AI credits a month for text, such as captions, plus Social Designer templates. AI images and photo edits start on the Creator plan at $4.99 a month.
What should I put in an AI caption prompt?
The product or offer, who it's for, why it matters now, the action you want, the tone and a word limit. The more specific the brief, the less you'll need to rewrite.
Are AI-generated images allowed on Instagram and Facebook?
Yes. Meta may label a post as AI content when it detects industry-standard signals that it was made with AI, and you can add the label yourself. Meta requires a label for photorealistic AI video or realistic AI audio, not for images.
Sources: Adobe Express pricing · Buffer pricing · OpenAI Help: ChatGPT Free tier FAQ · Metricool Help: free vs premium · Predis.ai pricing · Meta Help: AI content labels. Prices and features checked October 2026. Tools change their plans often, so confirm on their own pricing page before you buy.