Excalidraw Diagram Generator

Create Excalidraw diagrams from text content with multiple output formats.

Output Modes

Select output mode based on the user's trigger words:

Workflow

1. Detect output mode from trigger words (see Output Modes table above)
2. Analyze content - identify concepts, relationships, hierarchy
3. Choose diagram type (see Diagram Types below)
4. Generate Excalidraw JSON (add animation order if Animated mode)
5. Output in correct format based on mode
6. Automatically save to current working directory
7. Notify user with file path and usage instructions

Output Formats

Mode 1: Obsidian Format (Default)

Output strictly in the following structure, with no modifications:

---
excalidraw-plugin: parsed
tags: [excalidraw]
---
==⚠  Switch to EXCALIDRAW VIEW in the MORE OPTIONS menu of this document. ⚠== You can decompress Drawing data with the command palette: 'Decompress current Excalidraw file'. For more info check in plugin settings under 'Saving'

# Excalidraw Data

## Text Elements
%%
## Drawing
\`\`\`json
{complete JSON data}
\`\`\`
%%

Key points:

• Frontmatter must include tags: [excalidraw]
• Warning message must be included in full
• JSON must be wrapped in %% markers
• No excalidraw-* plugin settings in frontmatter other than excalidraw-plugin: parsed (the tags: [excalidraw] entry above is separate and still required)
• File extension: .md

Mode 2: Standard Excalidraw Format

Output pure JSON file, openable on excalidraw.com:

{
  "type": "excalidraw",
  "version": 2,
  "source": "https://excalidraw.com",
  "elements": [...],
  "appState": {
    "gridSize": null,
    "viewBackgroundColor": "#ffffff"
  },
  "files": {}
}

Key points:

• source uses https://excalidraw.com (not the Obsidian plugin)
• Pure JSON, no Markdown wrapping
• File extension: .excalidraw

Mode 3: Animated Excalidraw Format

Same as Standard format, but each element adds a customData.animate field to control animation order:

{
  "id": "element-1",
  "type": "rectangle",
  "customData": {
    "animate": {
      "order": 1,
      "duration": 500
    }
  },
  ...other standard fields
}

Animation order rules:

• order: Playback order (1, 2, 3...) — lower numbers appear first
• duration: Drawing duration for the element (milliseconds), default 500
• Elements with the same order appear simultaneously
• Recommended order: title → main framework → connection lines → detail text

Usage:

1. Generate the .excalidraw file
2. Drag to https://dai-shi.github.io/excalidraw-animate/
3. Click Animate to preview, then export as SVG or WebM

File extension: .excalidraw

Diagram Types & Selection Guide

Choose the appropriate diagram type to maximize clarity and visual impact.

Design Rules

Text & Format

• All text elements must use fontFamily: 5 (Excalifont handwriting font)
• Double quote replacement: replace " with 『』
• Parentheses replacement: replace () with 「」
• Font size rules (hard minimums — below these values, text is unreadable at normal zoom):
  • Title: 20-28px (minimum 20px)
  • Subtitle: 18-20px
  • Body/labels: 16-18px (minimum 16px)
  • Minor annotations: 14px (only for unimportant auxiliary notes, use sparingly)
  • Never go below 14px
• Line height: all text uses lineHeight: 1.25
• Text centering: standalone text elements have no auto-centering — manually calculate x coordinate:
  • Estimate text width: estimatedWidth = text.length * fontSize * 0.5
  • Centering formula: x = centerX - estimatedWidth / 2
  • Example: text "Hello" (5 chars, fontSize 20) centered at x=300 → estimatedWidth = 5 * 20 * 0.5 = 50 → x = 300 - 25 = 275

Layout & Design

• Canvas range: keep all elements within 0-1200 x 0-800 area
• Minimum shape size: rectangles/ellipses with text must be at least 120x60px
• Element spacing: minimum 20-30px gap to prevent overlap
• Clear hierarchy: use different colors and shapes to distinguish information levels
• Graphic elements: use rectangles, circles, arrows etc. to organize information
• No Emoji: do not use any Emoji symbols in diagram text — use simple shapes (circles, squares, arrows) or color coding instead

Color Palette

Text colors (strokeColor for text):

Shape fill colors (backgroundColor, fillStyle: "solid"):

Region background colors (large rectangle + opacity: 30, for layered diagrams):

Contrast rules:

• Text on white background must be no lighter than #757575
• On light fills, use dark color variants (e.g., on light green use #15803d, not #22c55e)
• Avoid light gray text (#b0b0b0, #999) on white backgrounds

See references/excalidraw-schema.md for full reference.

JSON Structure

Obsidian mode:

{
  "type": "excalidraw",
  "version": 2,
  "source": "https://github.com/zsviczian/obsidian-excalidraw-plugin",
  "elements": [...],
  "appState": { "gridSize": null, "viewBackgroundColor": "#ffffff" },
  "files": {}
}

Standard / Animated mode:

{
  "type": "excalidraw",
  "version": 2,
  "source": "https://excalidraw.com",
  "elements": [...],
  "appState": { "gridSize": null, "viewBackgroundColor": "#ffffff" },
  "files": {}
}

Element Template

Each element requires these fields (do NOT add extra fields like frameId, index, versionNonce, rawText -- they may cause issues on excalidraw.com. boundElements must be null not [], updated must be 1 not timestamps):

{
  "id": "unique-id",
  "type": "rectangle",
  "x": 100, "y": 100,
  "width": 200, "height": 50,
  "angle": 0,
  "strokeColor": "#1e1e1e",
  "backgroundColor": "transparent",
  "fillStyle": "solid",
  "strokeWidth": 2,
  "strokeStyle": "solid",
  "roughness": 1,
  "opacity": 100,
  "groupIds": [],
  "roundness": {"type": 3},
  "seed": 123456789,
  "version": 1,
  "isDeleted": false,
  "boundElements": null,
  "updated": 1,
  "link": null,
  "locked": false
}

strokeStyle values: "solid" (default) | "dashed" | "dotted". Dashed lines are suitable for optional paths, async flows, weak associations, etc.

Text elements add:

{
  "text": "Display text",
  "fontSize": 20,
  "fontFamily": 5,
  "textAlign": "center",
  "verticalAlign": "middle",
  "containerId": null,
  "originalText": "Display text",
  "autoResize": true,
  "lineHeight": 1.25
}

Animated mode additionally adds a customData field:

{
  "id": "title-1",
  "type": "text",
  "customData": {
    "animate": {
      "order": 1,
      "duration": 500
    }
  },
  ...other fields
}

See references/excalidraw-schema.md for all element types.

Additional Technical Requirements

Text Elements Handling

• The ## Text Elements section in Markdown must be left empty, using only %% as delimiters
• The Obsidian Excalidraw plugin will automatically populate text elements from the JSON data
• No need to manually list all text content

Coordinates & Layout

• Coordinate system: origin (0,0) is at the top-left
• Recommended range: all elements within 0-1200 x 0-800 pixels
• Element IDs: each element needs a unique id (can be strings like "title", "box1", etc.)

Required Fields for All Elements

IMPORTANT: Do NOT include frameId, index, versionNonce, or rawText fields. Use boundElements: null (not []), and updated: 1 (not timestamps).

{
  "id": "unique-identifier",
  "type": "rectangle|text|arrow|ellipse|diamond",
  "x": 100, "y": 100,
  "width": 200, "height": 50,
  "angle": 0,
  "strokeColor": "#color-hex",
  "backgroundColor": "transparent|#color-hex",
  "fillStyle": "solid",
  "strokeWidth": 2,
  "strokeStyle": "solid|dashed|dotted",
  "roughness": 1,
  "opacity": 100,
  "groupIds": [],
  "roundness": {"type": 3},
  "seed": 123456789,
  "version": 1,
  "isDeleted": false,
  "boundElements": null,
  "updated": 1,
  "link": null,
  "locked": false
}

Text-Specific Properties

Text elements (type: "text") require additional properties (do NOT include rawText):

{
  "text": "Display text",
  "fontSize": 20,
  "fontFamily": 5,
  "textAlign": "center",
  "verticalAlign": "middle",
  "containerId": null,
  "originalText": "Display text",
  "autoResize": true,
  "lineHeight": 1.25
}

appState Configuration

"appState": {
  "gridSize": null,
  "viewBackgroundColor": "#ffffff"
}

files Field

"files": {}

Common Mistakes to Avoid

• Text offset — standalone text element x is the left edge, not center. Must use the centering formula to manually calculate, or text will be off to one side
• Element overlap — elements with similar y coordinates easily stack. Check for at least 20px spacing before placing new elements
• Insufficient canvas padding — don't place content flush with canvas edges. Leave 50-80px padding on all sides
• Title not centered over diagram — title should be centered over the overall width of the diagram below it, not fixed at x=0
• Arrow label overflow — long text labels (e.g., "ATP + NADPH") will exceed short arrows. Keep labels short or increase arrow length
• Insufficient contrast — light text on white background is nearly invisible. Text color must be no lighter than #757575; colored text should use dark variants
• Font size too small — below 14px is unreadable at normal zoom; body text minimum is 16px

Implementation Notes

Auto-save & File Generation Workflow

When generating an Excalidraw diagram, automatically execute these steps:

1. Choose the appropriate diagram type

• Based on the content provided by the user, refer to the "Diagram Types & Selection Guide" table above
• Analyze the core requirements of the content and select the most suitable visualization

2. Generate a meaningful filename

Select file extension based on output mode:

3. Auto-save using the Write tool

• Save location: current working directory (auto-detect from environment)
• Full path: {current_directory}/[filename].md
• This enables flexible migration without hardcoded paths

4. Ensure Markdown structure is completely correct

Must generate in the following format (no modifications allowed):

---
excalidraw-plugin: parsed
tags: [excalidraw]
---
==⚠  Switch to EXCALIDRAW VIEW in the MORE OPTIONS menu of this document. ⚠== You can decompress Drawing data with the command palette: 'Decompress current Excalidraw file'. For more info check in plugin settings under 'Saving'

# Excalidraw Data

## Text Elements
%%
## Drawing
\`\`\`json
{complete JSON data}
\`\`\`
%%

5. JSON data requirements

• Include complete Excalidraw JSON structure
• All text elements use fontFamily: 5
• Replace " with 『』 in text
• Replace () with 「」 in text
• JSON format must be valid and pass syntax checking
• All elements have unique id values
• Include appState and files: {} fields

6. User feedback and confirmation

Report to the user:

• Diagram has been generated
• Exact save location
• How to view it in Obsidian
• Design choices made (what diagram type was chosen and why)
• Whether adjustments or modifications are needed

Example Output Messages

Obsidian mode:

Excalidraw diagram generated!

Saved to: business-model.relationship.md

Usage:
1. Open this file in Obsidian
2. Click the MORE OPTIONS menu (top right)
3. Select "Switch to EXCALIDRAW VIEW"

Standard mode:

Excalidraw diagram generated!

Saved to: business-model.relationship.excalidraw

Usage:
1. Open https://excalidraw.com
2. Click top-left menu → Open → select this file
3. Or drag and drop the file onto the excalidraw.com page

Animated mode:

Animated Excalidraw diagram generated!

Saved to: business-model.relationship.animate.excalidraw

Animation order: Title(1) → Main framework(2-4) → Connectors(5-7) → Detail text(8-10)

To generate animation:
1. Open https://dai-shi.github.io/excalidraw-animate/
2. Click Load File and select this file
3. Preview the animation
4. Click Export to save as SVG or WebM