AI Tools5 min read

How to Make Diagrams with ChatGPT (No Design Skills Needed)

Use the Diagrams: Show Me plugin to create flowcharts, timelines, and mind maps with ChatGPT, then polish them in Miro in minutes, no design experience required.

Choosing the right diagram type matters more than the diagram itself. That one shift in thinking is what took my diagrams from generic to genuinely useful, and it's what separates people who get value from AI diagram tools from people who just end up with a confusing flowchart they never use.

I tested more than 10 ChatGPT diagram plugins before settling on one: Diagrams: Show Me. Whimsical, Diagram Genius, UML Diagram Creation Expert, Diagrams Data Research, I ran them all. Diagrams: Show Me consistently gave the most usable output and the cleanest integration with Miro for editing. Not sponsored, just the one that worked.

Start with the right diagram type#

Before you generate anything, ask ChatGPT what you should generate. This sounds obvious but almost nobody does it.

The logic is simple. Different diagram types serve completely different purposes:

• Flowchart or timeline, if you're showing a process or sequence of events
• Mind map, if you're brainstorming or organizing a cluster of related ideas
• Comparison chart or bar graph, if you're weighing options or highlighting advantages

Picking the wrong type doesn't just look bad, it actively obscures the point you're trying to make. A mind map of a step-by-step process is confusing. A flowchart of loosely related concepts is cluttered. The diagram type is load-bearing.

The prompt that does the heavy lifting#

Here's the exact prompt structure I use before creating anything:

"Please give me some suggestions on what diagrams I could use to explain my article better. My article is below: [paste content]"

I did this with a blog post I'd written about stock appreciation rights (SARs), a topic that's dense and text-heavy with no visual content. ChatGPT came back recommending a flowchart, a timeline, a comparison chart, a bar/line graph, and a mind map. From there, I picked the one that fit what I was trying to communicate and asked it to generate that specific diagram.

That two-step approach, ask first, generate second, consistently produces better output than jumping straight to "make me a flowchart about X."

If you're creating diagrams to support blog content and want to make sure you're writing about topics worth visualizing in the first place, my SEO Keyword Generator GPT can help you find the angles that actually get search traffic before you build anything around them.

Walking through a real session#

Flowchart first. After pasting my SAR blog post and getting diagram recommendations, I asked for a flowchart. The output mapped the full SAR lifecycle: grant, vesting period, conditional met or not, exercise window, payout in cash or stock. Solid structure, immediately readable. From there, Diagrams: Show Me gives you three options, view the full diagram, download as PNG, or edit in Miro.

Then a timeline. For this one, I got specific. Vague prompts produce vague diagrams. I told ChatGPT exactly what milestones to include: grant date, three-year vesting period from 2022 to 2024, exercise window from 2025 to 2028. The more concrete the input, the more accurate the output. If you want a timeline that actually represents something, give it the actual dates.

Then a mind map. I asked for a mind map of the benefits of SARs for employees and companies. The initial output was, honestly, a mess, nodes scattered, layout hard to follow. This is normal. The plugin output is a starting point, not a finished product.

Where Miro and Mermaid come in#

"ChatGPT is a good starting point, but after that you can just create the charts exactly how you want them to be."

That's the whole workflow in one sentence. The plugin gets you 70% of the way there. Miro gets you the rest.

When you click "edit in Miro," the diagram imports directly. From there you can rearrange nodes, adjust styling, bold or highlight specific text, and shuffle the layout until it actually looks like something you'd put in a presentation or on a page. No design skills required, it's drag, click, and done.

If you prefer code-based editing, the plugin also has an "edit with code" option that opens in Mermaid. Click into the theme settings, switch to dark mode, and the same diagram looks completely different. Worth trying if you want a polished look without touching Miro.

The diagrams I ended up with after editing: a SAR vs. stock options comparison chart, a benefits breakdown for employees versus companies, and a clean lifecycle timeline showing how SARs are granted and exercised. None of them looked like the raw plugin output. All of them were usable.

The actual workflow, condensed#

1. Paste your content and ask ChatGPT which diagram type fits best
2. Pick the recommendation that matches what you're trying to show
3. Prompt with specifics, dates, milestones, named options, whatever the diagram needs to be accurate
4. Generate through Diagrams: Show Me
5. Open in Miro or Mermaid and clean up the layout and styling
6. Export as PNG

One ChatGPT session. No Illustrator, no Figma, no design background. If you already know how to use ChatGPT plugins for content creation, this fits directly into that workflow, and if you want to go deeper on building custom AI tools around your content process, building your own Custom GPT is a natural next step.

The plugin ecosystem changes fast, new tools ship constantly and existing ones update. Try a few, see what gives you the cleanest output for your use case. But start with Diagrams: Show Me. It's where I landed after testing everything else, and it's still the one I reach for.

Watch the full video on YouTube: https://youtu.be/jXBvHBgjugQ

This post contains affiliate links. I only recommend tools I actually use.