Heatmap Generator

Turn three columns — row, column, value — into a heatmap with a colour scale.

Your data never leaves this browser

The file is parsed, previewed and charted on your own device. Nothing is uploaded — not even a sample. Close the tab and the data is gone.

Or paste table text

Load a table with two category columns and a value column, then click Generate chart.

How it works

  1. 1.Load a table where each row is one observation: the two things you want on the axes, and the number.
  2. 2.Pick the horizontal and vertical columns plus the value column. If several rows land in the same cell, choose whether to sum or average them.
  3. 3.Click Generate chart — colour runs from pale (lowest value) to dark (highest), and the colour scale is under the chart.
  4. 4.Download the PNG. Rows with a missing axis value or a non-numeric value are listed under the chart.

Frequently asked questions

Do I get free credits to try Heatmap Generator?
Yes — new accounts get 3 free credits to spend on any tool, Heatmap Generator included. After that you only pay for what you run.
How many credits does Heatmap Generator cost?
Everything runs in your browser and nothing is uploaded: free accounts pay 1 credit per run, and Pro or Pro+ members run it as often as they like.
Is the content I paste private?
Heatmap Generator uses your input only to generate the result. Stored results are deleted automatically by our retention policy, and you can remove any run from your history.
Do I need to install anything?
No. Heatmap Generator works in any modern browser — nothing to download or install.