AI Social Media Designer: Posts and Stories From a Prompt

VdoBloom's Social Media Designer generates posts and stories from a text prompt, or from a product photo you upload, using the Nano Banana 2 family of image models. You pick the format and the model, and the price is that model's per-image price — from 3 credits on Nano Banana 2.1 at 1K.

Disclosure: VdoBloom is our platform.

What it does

This is a design tool for the two shapes social feeds actually use: the square post and the tall story. You describe the image you want, or you hand it a product photo, and it returns a finished-looking piece of artwork in the shape you chose. It is not a template editor and it is not a scheduler — it is the step that produces the picture, so you can stop opening a blank canvas and start from a direction.

From a prompt: describe the post and generate it, from scratch.
From a product photo: upload your product and place it in a scene or a branded layout, keeping the product as it is.
Formats: square posts and vertical story shapes.
Model choice: pick the image model, and the price follows that model's per-image rate.

Models and price

All four options come from the same Nano Banana 2 family, so the tool behaves the same way whichever you pick — what changes is the resolution headroom and the price per image.

Model	Price per image
Nano Banana 2.1	3 credits (1K), 4 (2K), 6 (4K)
Nano Banana 2 Lite	8 credits
Nano Banana 2	15 credits
Nano Banana Pro	18–24 credits by resolution

One-time credits that never expire; new accounts get 10 free credits, enough for three 1K posts on Nano Banana 2.1.

Which model should you pick

Learning the tool and drafting ideas: Nano Banana 2.1 at 1K. At 3 credits, you can iterate quickly without spending much.
A post that needs to hold up on a big feed: step up to 2K or 4K on Nano Banana 2.1, or move to a higher model if the detail matters.
Higher-end output: Nano Banana Pro at the resolution your channel needs.

The honest rule is to start cheap, look at the result, and only pay more when the framing and composition are already right. Resolution does not fix a bad idea.

From a prompt versus from a product photo

These are two different jobs. When you write a prompt, you are asking for a new image and everything in it is your decision — subject, background, mood, lighting, colour. When you upload a product photo, the tool keeps the product as it is and builds the scene around it, which is what you want when the product itself has to look exactly right.

Use the prompt route for announcements, tips, quotes, seasonal posts, and anything where the visual is the message.
Use the product-photo route for a new launch, a sale, a catalogue shot, or a before-and-after where the object cannot be altered.

Writing a post prompt that works

Vague prompts give vague pictures. A prompt that reads like a short art direction brief does far better.

Name the subject first: what is the picture of?
Set the scene: a studio backdrop, a marble counter, a sunlit desk, a clean gradient.
Say the mood: bright and cheerful, calm and premium, bold and loud.
Mention the palette when you have brand colours you want to lean toward.
Leave room for text. If you plan to add a caption afterwards, ask for a clean area of background rather than packing the frame.

Ideas and use cases

Product drops: place a real product photo on a themed backdrop for launch day.
Quote and tip cards: generate a background image, then add your words in an editor.
Story covers: vertical images that frame a link or a poll.
Seasonal and holiday posts: refresh the same product in a new setting each month.
Content calendars: build a bank of backgrounds once, then reuse them across a week of posts.

A simple workflow that holds a brand together

Decide your two or three go-to looks — the backdrop style and mood you want people to recognise.
Draft at 1K on Nano Banana 2.1 until the composition is right.
Re-generate the winner at the resolution your channel needs.
Add any text and your logo in an editor, where letters will be exact.

Realistic limits

Text in the image: AI models draw letters as art, so short words are usually fine but long lines and small print are where mistakes appear. Add important text afterwards if it has to be perfect.
The output is a picture, not a finished campaign — you still choose the caption, the hashtags and when to post.
Consistency takes effort: if you want every post to match, reuse the same wording for your look rather than reinventing it each time.

Sizing and where each format goes

The tool gives you the two shapes that cover almost everything a feed asks for. Choosing the right one before you generate saves a redo.

Square posts are the safe default: they sit well in a feed grid and crop gracefully to a profile wall.
Vertical stories fill the whole phone screen, which is why they suit stories, reels covers and anything you plan to overlay text on.

If a post has to live in more than one place, generate the square version for the grid and a vertical version for stories, and keep the subject centred in both so nothing important falls off the edge.

Common mistakes to avoid

Packing the frame. Leave space if you plan to add a caption later, or the text will fight the background.
Asking for too much at once. One clear idea per image reads better than three competing ones.
Trusting in-image text. Short words are usually fine, but anything that must be exact is safer added in an editor.
Generating at the highest resolution first. Draft cheap, then commit, so you are not paying top rate for a framing you will change.

How to do it on VdoBloom

Open the Social Media Designer.
Type a prompt, or upload a product photo, and choose a format.
Pick a model, and generate.

Frequently Asked Questions

Can I use my own product photo?

Yes — upload it and the tool places it in the scene while keeping the product itself.

What does it cost?

The per-image price of the model you choose, from 3 credits on Nano Banana 2.1 at 1K.

Can I make story-shaped images?

Yes — choose the vertical format for stories and reels covers.

Do I need an account?

A free account gets you 10 free credits, which is enough to try a few posts before you spend anything.

Can I add my logo and caption text in the tool?

The tool generates the image. For exact wording and a crisp logo, add them afterwards in an editor where letters render perfectly.

Will every post look different from the last?

Only if you want it to. Reuse the same scene and mood wording and the results will feel like a set.

Questions people ask about this

How do I stop my AI posts looking generic and off-brand?

Decide your two or three go-to looks first — the backdrop style and mood you want people to recognise — and then reuse the same wording for that look every time instead of reinventing it. Mention your palette in the prompt when you have brand colours to lean toward, and keep the subject centred so the composition stays consistent. Consistency comes from repeating a direction, not from asking for something new each time.

Can I get both a square post and a story from one idea?

Yes. The tool gives you the square post shape and the vertical story shape, so you can generate the same idea in both formats. Keep the subject centred in each so nothing important falls off the edge when the shape changes.

Do I still need an editor or templates once I am using AI?

For the picture itself, no — the tool produces the image. But for exact wording and a crisp logo, add them afterwards in an editor where letters render perfectly, because AI models draw letters as art and long lines or small print are where mistakes appear.

How do I write a prompt that gives me a usable post?

Write it like a short art direction brief: name the subject first, set the scene, say the mood, and mention the palette if you have brand colours. If you plan to add a caption afterwards, ask for a clean area of background rather than packing the frame. One clear idea per image reads better than three competing ones.

Can I build a whole carousel or a week of posts from one idea?

You can build a bank of backgrounds once and reuse them across a week of posts, and you can refresh the same product in a new setting each month. Each image is generated separately, so keep the same scene and mood wording across the set and the results will feel like a set rather than a random pile.

How can I tell if a post was made with AI?

The most common tell is text inside the image: short words are usually fine, but long lines and small print are where mistakes appear, so anything that must be exact is safer added in an editor. Beyond that, look at whether the composition feels packed or the idea feels muddled — those are the same mistakes a human designer can make, so they are not proof on their own.

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