Treemap Generator — Visualize Hierarchical Data Online
Turn nested data into an interactive treemap. Enter JSON with a hierarchical structure and see proportional rectangles colored by depth level. All data stays in your browser — nothing leaves your device.
How to Use the Treemap Generator
- Enter JSON data — provide a hierarchical JSON structure with a root object containing nested
childrenarrays andvalueproperties on leaf nodes. - Click Render — the treemap computes proportional rectangles for each node based on its value relative to siblings.
- Read the colors — each depth level gets a different color, making it easy to distinguish parent from child categories.
- Load a sample — click "Load Sample" to see a company department breakdown instantly.
- Export — download the treemap as an SVG for use in documents or presentations.
Why Treemaps Are Powerful
Treemaps excel at displaying hierarchical data in a compact space. Unlike tree diagrams that use lines and nodes, treemaps fill the entire area with proportional rectangles, giving you an immediate sense of relative sizes across the entire dataset.
They're perfect for visualizing disk usage, market capitalizations, budget breakdowns, and any scenario where you need to compare values across nested categories at a glance.
Frequently Asked Questions
Use a nested object with name, optional children array, and value on leaf nodes. Example: {"name":"Root","children":[{"name":"A","value":30}]}
Each depth level in the hierarchy gets a distinct color. The root children are one color, their children another, and so on. This makes the visual hierarchy immediately clear.
Treemaps use rectangular tiles and are better for comparing absolute sizes. Sunburst charts use radial slices and emphasize the hierarchical nesting. Both show the same data, but treemaps are more space-efficient.
Use Cases
Disk Space Analysis
Visualize how storage is used across folders and files, instantly seeing which directories consume the most space.
Market Share Visualization
Show market capitalization or revenue breakdowns by category, making it easy to compare competitors at a glance.
Inventory Categorization
Display product inventory across categories and subcategories, helping identify overstocked or understocked areas.
Team Structure Visualization
Show organizational hierarchies with proportional sizing based on team size or budget allocation.