Heatmap Chart Generator

A heatmap chart uses a color gradient to represent numeric values across a grid of rows and columns. Use one when you want to compare values across two categorical dimensions simultaneously — for example, sales by product and quarter, or survey ratings by question and respondent group. The color intensity makes patterns, outliers, and clusters visible at a glance, making heatmaps ideal for large matrices where a table would be hard to scan.

Yes. The core heatmap generator is completely free with no sign-up required. You can create, customize, and download heatmap charts without any account. Free AI credits are also included so you can try AI-powered generation. Paid plans unlock more AI credits, file upload, and advanced export options.

Open the heatmap generator, enter your row labels, column labels, and numeric values in the data table. The chart updates in real time as you type. Choose a color scheme, adjust display settings, then download or share your finished heatmap — all in under two minutes.

Absolutely. Type a description of what you want — such as 'quarterly revenue by product for 2024' — and the AI will produce a heatmap with structured sample data and appropriate color mapping. You can then replace the sample values with your real data or let AI refine the chart through chat.

The heatmap maker includes nine built-in schemes: Viridis, Plasma, Turbo, Reds, Blues, Greens, Greys, Oranges, and Purples. You can also switch on custom colors and pick your own hex values for the minimum and maximum ends of the gradient to match any brand palette.

Yes. Toggle 'Show values in cells' in the Display Settings panel to overlay the exact numeric value on each cell. You can also adjust the value font size independently from the label font size to keep the chart legible at any scale.

Use the download button to save your heatmap as a PNG or SVG image. You can also copy a shareable link to send directly to colleagues, or grab an embed code to add the chart to any website or blog. PNG and link sharing are available on the free plan; SVG and embed codes are available on paid plans.

On the free plan, you can type or paste data directly into the table. Pro plan users can upload CSV or Excel files, and the system will automatically map rows, columns, and values into the heatmap structure.

The generator supports as many rows and columns as you need for typical business and analytical heatmaps. For very large matrices with hundreds of cells, Pro plan users can upload files to populate the chart without manual entry.

Yes. Any symmetric grid of numeric values works perfectly in the heatmap chart generator. Enter your correlation coefficients or confusion matrix counts as cell values, label each row and column with the corresponding variable or class, and the color gradient will immediately highlight strong and weak relationships.