Gemini AI Prompts for Logo and Brand Ideas: A Designer's Guide

Every logo project starts the same way: a blank page, a brief that says “modern but warm”, and a client who will only know what they want once they see it. The first round of sketches is where most of the hours go, and most of those sketches end up in the bin.

That first round is exactly where an image model can help. Not to design the logo, but to show you ten directions in the time it used to take to draw two, so you can spend your real effort on the one that deserves it.

Google’s image model inside the Gemini app, nicknamed Nano Banana, is especially useful here because it handles text inside images far better than older models. Ask it for a wordmark and you usually get the letters you asked for, not a blur of almost-letters. Here is a workflow that keeps the AI in the sketchbook stage, where it belongs.

Step 1: Turn the brief into words the model understands

A client brief is full of feelings: “trustworthy”, “playful”, “premium but not cold”. A model needs things it can draw. Before you open Gemini, translate the brief into four concrete lines:

What it is: the brand name, and what the company does in five words.
Shape language: rounded or sharp, geometric or hand-drawn, heavy or light.
Color: two or three colors, named plainly (“deep teal and warm cream”).
Use: where it has to work first (an app icon, a shop sign, a label).

This list is also the best brief you will ever write for yourself, with or without AI.

Step 2: Ask for directions, not a final logo

The most common mistake is asking for “a logo for my bakery” and judging the first result. Ask instead for a sheet of options, so the model explores and you compare:

A sheet of six minimal logo concepts for “Ember & Oak”, a small coffee roastery. Flat vector style on a plain off-white background, each concept in its own square. Mix wordmarks, a monogram and a simple symbol. Deep brown and warm orange only. No gradients, no mockups.

Run it two or three times. You will get repeats and duds, and that is fine: you are looking for one or two ideas worth stealing from yourself.

Step 3: Push the promising direction

Once a direction stands out, describe it back to the model and change one thing at a time. Changing everything at once makes it impossible to tell which word did the work.

A minimal monogram logo combining the letters “E” and “O”, the O drawn as a coffee bean outline. Thick, even strokes, rounded ends. Deep brown on off-white. Flat vector style, centered, no other elements.

Then vary a single element: stroke weight, the shape of the bean, or the color. Keep notes on what each change did. Ten minutes of this tells you more about a direction than an hour of thumbnails.

Step 4: See it in the real world before you commit

A mark that looks good on a white square can fall apart on a cup or a phone screen. This is where the model saves real time, because you can mock up a rough concept in context before you vectorize anything:

A paper to-go coffee cup on a wooden counter, natural window light, with a simple brown monogram logo of the letters “E” and “O” printed on the side. Realistic product photo, shallow depth of field.

A small brand board for a coffee roastery: the logo, a color palette of deep brown, warm orange and cream with swatches, and a sample of a rounded sans-serif headline font. Clean grid layout on white.

If the mark disappears at cup size or looks generic next to the palette, you have learned that for free.

Step 5: Leave the AI behind and draw it properly

Everything the model gives you is a sketch. The final logo still needs to be redrawn as clean vectors in Illustrator, Figma or Affinity, with your own curves, spacing and type decisions. That step is not optional, for three reasons:

Quality: generated images are raster pixels with uneven edges. A logo has to scale from a favicon to a billboard.
Ownership: rules on who owns AI-generated images vary by country and are still changing. A logo you have redrawn and refined yourself is much easier to stand behind.
Originality: models can drift towards marks that already exist. Before you present anything, run a quick reverse image search and check trademark databases for close matches. And never prompt with another brand’s name or “in the style of” a real company.

Where to find prompts that already work

Writing prompts from scratch is a skill of its own, and it is easy to waste an afternoon on wording. A faster way to learn is to study prompts next to the images they produced. Libraries such as Prompset’s Nano Banana prompts show thousands of real examples, logos and brand mockups included, so you can see how other people phrase color, layout and text before writing your own.

Pick one that is close to what you need, change the brand name and the colors, and use it as your starting point for Step 2.

The bottom line

Used this way, Gemini does not replace the designer. It replaces the slowest part of the first round: drawing ideas you already suspect will not work. You still own the brief, the judgment and the final drawing. You just reach the good idea sooner, and you walk into the first client meeting with ten directions instead of three.

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Bogdan Sandu

Bogdan Sandu is a seasoned designer who has been designing websites since 2008.

Renowned for his expertise in logo design and visual branding, Bogdan has developed a multitude of logos for various clients.

His skills extend to creating posters, vector illustrations, business cards, and brochures. Additionally, Bogdan's UI kits were featured on marketplaces like Visual Hierarchy and UI8.

He also wrote in the past years on sites like Design Your Way, WebDesignerDepot, WPDean, Designmodo, Speckyboy, Slider Revolution, and more.

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