Heatmap Maker

• Free online heatmap maker with customizable data matrix, row and column labels, and color gradients to generate professional heatmaps in real time
• Built-in color schemes for green-red, blue-orange and purple-yellow, plus color pickers to set your own low and high colors
• Automatically calculates and displays minimum, maximum, average and sum values, with a gradient color legend
• One-click export to high-resolution PNG — ideal for data analysis, sales statistics, temperature distribution and performance monitoring

1. Open the tool page — no download or installation needed, and a sample dataset loads automatically
2. Adjust the row and column counts (2–15) and, if needed, enter the row and column labels separated by commas
3. Fill in a value for each cell of the matrix, and the heatmap updates in real time; click "Load Sample" to restore or change the data quickly
4. Choose a color scheme or set custom low/high colors, check the statistics, and click "Export Image" to save it as a PNG when ready

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device
• The row and column counts are limited to 2–15; separate row/column labels with commas, and any missing ones are filled with default labels automatically

Free online heatmap maker tool. Customize data matrix and color gradients to generate professional heatmaps in real time. Ideal for data analysis, sales statistics, temperature distribution, and performance monitoring.

Open the tool page — no download or installation needed, and a sample dataset loads automatically Adjust the row and column counts (2–15) and, if needed, enter the row and column labels separated by commas Fill in a value for each cell of the matrix, and the heatmap updates in real time; click "Load Sample" to restore or change the data quickly Choose a color scheme or set custom low/high colors, check the statistics, and click "Export Image" to save it as a PNG when ready

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device The row and column counts are limited to 2–15; separate row/column labels with commas, and any missing ones are filled with default labels automatically

Yes, Heatmap Maker is completely free. No download or installation required — it runs right in your browser.