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Chart tools Relationships

Heatmap

Colour a grid of cells by value.

When to use a heatmap

Use it to spot patterns across two dimensions, like day of week and hour.

How to make one

  1. Paste your data into the Data box, or upload a CSV. The example shows the columns it needs.
  2. Add a title, subtitle and source under Text.
  3. Pick colours, a font and a size under Style: 16:9 for slides, 1:1 for WhatsApp and LinkedIn, 4:5 for Instagram posts, 9:16 for Stories, Reels and TikTok.
  4. Press Play to animate it, or Present to show it full screen.
  5. Press Share & export. On a phone, send the image, an MP4 video of the animation or a link straight to WhatsApp, Instagram, TikTok or LinkedIn. On a computer, copy it into your slides or download a PNG, SVG or PowerPoint file.

Everything runs in your browser. Your data isn't uploaded anywhere, and your last chart is remembered on this device.

Questions about the heatmap

What data do I need for a heatmap?

Three columns: row, column, value. Or a grid: row names in the first column, then one number column per column. Paste it from Excel or Google Sheets, upload a CSV, or connect a live Google Sheet.

When should I use a heatmap?

Use it to spot patterns across two dimensions, like day of week and hour.

What's the most common mistake with a heatmap?

Rows and columns in a random order. Order them by time or by value so patterns appear.

Can I animate it, download it or put it in PowerPoint?

Yes. Press Play to animate it, record an MP4 or GIF, or download a PNG, SVG or PowerPoint file. In PowerPoint it's added as a high-resolution image. It's free, with no sign-up.

More in Relationships

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Scatter plot

Plot two measures against each other to reveal a relationship.

Bubble chart

A scatter plot where bubble size adds a third measure.

Radar chart

Compare several measures on axes arranged in a circle.

Parallel coordinates

Draw each item as a line across several vertical axes.