Free · Turn a grid into colour

Matrix Heatmap Maker

Convert row, column, and value data into a colour grid with hover values and a clear scale.

  • Live interactive chart
  • Data stays in this tab
  • PNG, SVG, and Plotly JSON

Build the data plot

Use the example or paste local CSV. Nothing is uploaded.

CSV dataexample.csv
Headings: row · column · value101 / 1,000,000 characters
9 points in 1 trace are ready to explore.Drag to zoom. Double-click to reset.
Rows9
Plotted9
Traces1
Warnings0
Starting the interactive plotPlotly is loading in this browser tab.

Three simple steps

How to use it

  1. Use the example or paste your own row, column, and value columns.
  2. Check the interactive plot and change its title or colours.
  3. Download a PNG, SVG, or reusable Plotly JSON file.

Your formulas and data stay on this device

Plotly.js and Papa Parse draw the graph inside this browser tab. Bookify does not upload or save the table. Formula tools use a small math parser, not code evaluation. Close the tab and the working copy is gone.