AI diagram generator

ERD Generator

Generate erds in seconds. Describe what you need in plain English – or paste in code – and Eraser draws it.

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How it works

How to generate an erd

Tips on generating an ERD
  • If available, instead of writing a prompt from scratch, consider pasting excerpts from existing code (e.g. SQL schema, ORM schema), call transcripts, requirements docs, or image files.
  • Iterating with an LLM to create a fleshed out diagram prompt can be effective. Ask it to list out entities including attributes and constraints. Then ask it to list out relationships between entities including cardinality.
Example diagrams
ERDs vs. database diagrams
  • ERDs are often database diagrams, representing the data model or data schema that is stored in a RDBMS (relational database management system).
  1. 1

    Write a prompt describing the data model in detail

    A simple one-liner (e.g. “draw a data model of a Twitter clone”) can work too but the best prompts are usually at least 3-4 sentences long. Applying the below framework generally yields good results:

    • First, write out the entities (i.e. tables). For the entities, you may want to specify attributes (i.e. columns) and their data types. You can also specify primary and foreign keys.
    • Then, write out the relationship between tables including the relationship cardinality.(e.g. “the user entity and the document entity have a one-to-many relationship via the userId attribute”)
  2. 2

    Generate a diagram with the completed prompt

  3. 3

    Edit the diagram with follow-up prompts (this step requires signing in to Eraser)

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FAQ

Frequently asked questions

  • Can I edit the generated erd?

    Yes. Click “Save and Edit Diagram” to open it in Eraser, where you can edit using diagram-as-code syntax or the visual GUI.

  • What can I use as a prompt?

    Plain English, a nested list, or a code snippet. You can also paste excerpts from requirements docs, transcripts, or knowledge-base articles.

  • Can I use this from an AI agent?

    Yes. Eraser runs an MCP server, so any MCP-compatible client – Claude, Cursor, or ChatGPT – can create and edit these diagrams directly. See the MCP catalog for what it exposes.

  • Who created this tool?

    The erd generator was created by the team at Eraser, leveraging frontier AI models. Eraser is an AI tool for technical design and documentation.

  • Is it free?

    Generating an erd is free and requires no sign-up. Sign in to a free Eraser account to edit, save, and export your diagrams.

  • Is there an API?

    Yes, you can read our API documentation. The API is only available to Starter, Business, and Enterprise Plan teams.

  • Is there an MCP server?

    Yes. The Eraser MCP server lets an agent create, search, read, update and export diagrams from clients like Claude, Cursor, VS Code and ChatGPT. It is free to use, subject to the AI credit limits of your plan.

  • Do you use my data to train AI models?

    No. Neither Eraser nor our model providers use your data to train AI models. Eraser may analyze usage to improve and enhance our AI features.

  • How do I get started?

    Describe what you need in the prompt box above and generate. You can keep refining the result with follow-up prompts.

  • What’s next for this tool?

    It only gets better from here. We’re working to improve accuracy and layout customization. If there’s something you’d like to see, drop us a note at hello@eraser.io.

  • How do I get in touch?

    We’d love to hear from you. Reach out at hello@eraser.io, on X (@eraserlabs), or join our Slack community.