Heatmaps

What is Heatmaps?

Heatmaps Generator is a free, browser-based tool that helps you produce ready-to-use output in seconds. Visualize a matrix as a heatmap. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

Used by

• Data analysts
• Product teams
• Students
• Researchers
• Developers
• Test-data teams

Recommended workflow

1. 1

   Prepare the input

   Generate a sample or helper artifact, then copy it into the workflow that needs it.

2. 2

   Run Heatmaps

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

   Next recommended tool

   Correlation Matrix: Pairwise correlations between numeric columns.

   Open tool
4. 4

   Then continue with

   CSV → Charts: Render quick charts from a CSV.

   Open tool
5. 5

   Then continue with

   Missing Data Heatmap: A heatmap that shows where the gaps are in your dataset.

   Open tool

Frequently asked questions

How do I use Heatmaps?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Visualize a matrix as a heatmap.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is Heatmaps Generator free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.