Tutorial · 3 min read
How to Create a Heatmap Table From a CSV
A heatmap table shades every cell by its value, so patterns and outliers jump out without reading a single number. Here's how to build one from a CSV and paste it straight into your site — no plugin required.
What a heatmap table is good for
Anywhere you have a grid of numbers and want the shape of the data to be obvious at a glance: weekly sales by region, scores by student and subject, uptime by service and day. A plain table makes you read every cell. A heatmap table lets you see it — the worst week, the best performer, the gap between them.
Build one — three steps
Go to makemyhtml.com and upload or paste your data. The first column becomes the row label; every other numeric column becomes its own shaded column in the heatmap.
Choose a low, mid, and high color — MakeMyHTML blends between them across your data's actual range, so the whole table shares one consistent scale and cells stay comparable to each other.
Click HTML Code and paste the result into a Custom HTML block. No plugin, no JavaScript, no iframe.
Have a spreadsheet full of numbers?
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