What data format does Heatmap Generator accept?

Use the first row for column labels, the first cell of every following row for a row label, and numeric values in the remaining cells. Keep the same number of cells in every row. Empty or nonnumeric cells are reported as missing instead of silently becoming zero.

Which heatmap color scale should I choose?

Use a sequential palette when values move from low to high, a diverging palette when positive and negative values should separate around a meaningful midpoint, and Viridis when you want a perceptually even scale that stays readable for many viewers.

Can a heatmap show exact values?

Turn on cell values to place each source number over its color. Contrast-aware text keeps labels readable against light and dark cells. For very large matrices, hide the numbers so readers can focus on the overall pattern, then provide the source table separately for precise lookup.

Can I make a correlation matrix heatmap?

Paste the same variable names across the header row and first column, followed by the correlation coefficients. Choose a diverging scale so negative and positive relationships separate around zero while the diagonal values remain visible. Review the coefficient range and labels before exporting the matrix.

Is this a geographic heat map generator?

This tool creates matrix heatmaps from labeled rows and columns; it does not place values on a geographic map. Use geographic mapping software when the analysis depends on addresses, boundaries, latitude, longitude, or spatial density. A matrix heatmap is better for comparing two categorical dimensions.

Can I edit or publish the exported heatmap?

Download SVG when you want editable vector text, cells, and legend, or choose PNG for immediate placement in a document or slide. Before publishing, compare every label, unit, palette meaning, minimum, and maximum with the source matrix, then add context for readers who cannot rely on color alone.

Does Heatmap Generator upload my data or require sign-up?

The precise heatmap workflow parses, summarizes, and renders the matrix locally in your browser without requiring an account. Your input is not sent to an image model. Avoid placing confidential identifiers in labels, and follow your organization’s data-handling requirements when storing or sharing exported charts.

FigEditor

Start Creating Free

Browser-based matrix visualization

Heatmap Generator for CSV and Excel Data

Use Heatmap Generator to turn a labeled matrix into a readable color map. Compare exact values across rows and columns, switch color scales, and export SVG or PNG directly in your browser.

Upload CSV/XLSX or paste spreadsheet matricesSequential, diverging, and Viridis palettesExact values with a shared legendEditable SVG and PNG export

Heatmap Examples for Correlation, Sales, Surveys, and Research

Start from an accurate matrix example, then replace its labels and values with your own data.

Create Matrix Heatmaps for Business and Scientific Data

Use a heatmap when the relationship between two categorical dimensions matters as much as each exact value.

Compare business performance

Scan regions, products, teams, or periods to find clusters of high and low performance.

Find website activity patterns

Map activity by hour, weekday, cohort, channel, or another repeated dimension.

Explore correlation matrices

Visualize relationships among research variables with positive and negative values around zero.

Summarize survey grids

Compare ratings across questions and groups while retaining the underlying scores.

Review learning outcomes

See performance across students, classes, assessments, or curriculum areas in one view.

Compare scientific measurements

Visualize expression values, experimental measurements, or coded observations across samples.

Make a Heatmap from CSV or Excel Data

Keep matrix input, color scale, exact values, preview, and export in one focused workspace.

Paste a complete labeled matrix

Copy rows with the header row and row labels intact.

Bring data from familiar tools

Upload CSV or XLSX files, or paste comma-, tab-, or semicolon-separated data from Excel, Google Sheets, CSV, or TSV.

Compare cells on one shared legend

Minimum and maximum values define a consistent scale across the full matrix.

Keep exact values visible

Show each numeric cell on top of its color whenever readers need precise lookup as well as pattern recognition.

Choose the scale that matches the data

Use sequential colors for magnitude, diverging colors around a midpoint, or perceptually even Viridis.

Export SVG or PNG

Save an editable vector for reports or a ready-to-share bitmap for documents and slides.

Why Use an Online Heatmap Maker

Move from raw matrix to presentation-ready visual without rebuilding the data in a full design application.

Stay tied to exact values

Every cell color is calculated deterministically from the visible numeric data.

See patterns immediately

The preview updates as soon as you paste or change the matrix.

Keep the precise workflow local

The browser-based chart renderer does not need to send the matrix to an image model.

Reuse a crisp vector

SVG export keeps text, cells, and legend sharp at document, slide, or poster size.

Make dense matrices scannable

Labels, values, contrast-aware text, and a shared legend keep the visual interpretable.

Match color to meaning

Switch palettes without re-entering the data or changing the matrix structure.

How to Create a Heatmap Online in 3 Steps

Paste a labeled matrix, choose a meaningful color scale, then export the heatmap you reviewed.

Step 1

Paste a labeled matrix

Include column labels in the first row, row labels in the first column, and numeric values in the remaining cells.

Step 2

Choose the palette and labels

Use a sequential, diverging, or Viridis scale and decide whether exact values should appear in every cell.

Step 3

Review and download

Check the minimum, maximum, missing cells, labels, and legend before exporting SVG or PNG.

Use Heatmap Generator Now

Heatmap Generator workspace with a labeled matrix, palette controls, and exact chart preview — A shared legend keeps every cell comparable across the matrix.Editable SVG and PNG

Choose the right visual

Matrix Heatmap vs Geographic and Attention Heatmaps

Match the visualization to the structure and question in your data.

Rows × columns

Matrix heatmap

Choose this tool when repeated row and column categories should expose patterns across both dimensions.

Make a matrix heatmap

Location data

Geographic heat map

Choose mapping software when addresses, boundaries, coordinates, or spatial density define the story.

Use a mapping tool

Visual attention

Attention heatmap

Choose an eye-tracking or predictive-attention tool when you need to evaluate where viewers look in an image.

Use an attention tool

Flexible pricing

Choose a plan that fits your figure workload

Start with free credits, subscribe for regular figure creation, or purchase a credit pack for your next paper or presentation.

Heatmap Generator FAQ

Answers about matrix format, palettes, correlation heatmaps, exports, and privacy.

Copy a rectangular matrix with column headers and row labels, then paste it into Heatmap Generator. Comma-, tab-, and semicolon-separated rows are supported. The preview calculates one shared color scale from the numeric cells, and you can export the result as SVG or PNG.

Create a Heatmap from Your Matrix

Paste the data, choose a color scale, and export an accurate SVG or PNG without signing up.

Use Heatmap Generator Now Try AI Chart Generator

Heatmap Generator for CSV and Excel Data

Use Heatmap Generator to turn a labeled matrix into a readable color map. Compare exact values across rows and columns, switch color scales, and export SVG or PNG directly in your browser.

Upload CSV/XLSX or paste spreadsheet matricesSequential, diverging, and Viridis palettesExact values with a shared legendEditable SVG and PNG export

Heatmap Generator for CSV and Excel Data

Heatmap Examples for Correlation, Sales, Surveys, and Research

Regional Sales Performance

Website Activity by Hour

Correlation Matrix

Survey Response Patterns

Student Assessment Scores

Gene Expression Profile

Classification Confusion Matrix

Building Energy Use