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CogniGuide

Free Online Spider Diagram Maker

See a sample spider diagram with main branches and sub-branches, then let AI build one from your own notes, PDF or slides.

No credit card required

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University of California, BerkeleyUniversity of MichiganGeorgetown UniversityUniversity of Southern CaliforniaUniversity of Wisconsin-MadisonUniversity of Illinois Urbana-Champaign

CogniGuide at a glance

What you get
Interactive mind maps of the main ideas and how they connect. Free: overview maps (detailed maps on your first 3 creations). Plus: detailed maps with supporting concepts.
Exports
Your first PDF or PNG export is free; Plus exports anytime.
Price
Free plan: 5 creations a week, up to 3 a day. Plus: $9.99/month or $99.90/year (USD; local prices at checkout).
Sign-up
A free account is required before you create anything (Google or email). No credit card.
What you can upload
PDF, Word (.docx), PowerPoint (.pptx), plain text or Markdown, and images (PNG, JPG, WebP, GIF), or type a topic. One file per creation on the free plan; several at once on Plus.

How it compares: vs Knowt · vs Quizlet · vs NotebookLM · vs Mapify

What the Spider Diagram Maker Does

Start from your material and get a branching diagram you can study, edit and test yourself on.

Built From Your Files

Upload a PDF, Word, PowerPoint, text or image file and the AI turns it into a radial diagram.

Clear Branch Structure

Each central idea splits into branches and sub-branches, so relationships are easy to see.

Next Steps From the Map

Expand any branch with AI, export as PNG or PDF, or turn the diagram into a quiz.

How to Make a Spider Diagram Online

Three steps take you from raw notes to a finished, shareable diagram.

  1. 1

    Add Your Material

    Upload a file or type the topic you want to map out.

  2. 2

    AI Builds the Diagram

    The AI finds the central idea and arranges related points as branches.

  3. 3

    Study, Edit and Export

    Expand branches, adjust text, then export or quiz yourself.

Spider Diagram Basics and Free Online Tools

A spider diagram, also called a radial diagram or web diagram, places one central idea in the middle and draws branches outward. Each branch holds a main subtopic, and smaller branches hold supporting details, examples or definitions. Because the layout radiates from the center, it shows how ideas connect at a glance, which makes it useful for brainstorming, planning and revision.

  • Central idea: the main topic placed in the middle
  • Main branches: the key subtopics that radiate outward
  • Sub-branches: supporting details, examples or definitions
  • Connections: links that show how branches relate
  • Review: a quick overview to test recall

Use the diagram to revise before an exam, plan an essay or brainstorm a project. To build a diagram from your own notes, create one with CogniGuide in a few clicks.

Explore related topics

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Spider Diagram Questions

Answers about spider diagrams and making one online.

What is a spider diagram used for?

A spider diagram shows one central idea with related points branching outward. It is used for brainstorming, organizing information, planning writing and revising a topic in a compact visual form.

How is a spider diagram different from a flowchart?

A spider diagram radiates from a central idea and shows associations, while a flowchart shows a sequence of steps or decisions. Spider diagrams suit topics where ideas connect in many directions.

Which files can I use to make a diagram?

You can upload PDF, Word (DOCX), PowerPoint (PPTX), text or Markdown files, or images. You can also just type a topic and the AI will build the diagram from it.

Is the spider diagram maker free to use?

Yes. The free plan allows 5 creations a week with no payment needed. Paid plans raise those limits. You can also turn a finished map into a quiz to test yourself.