Free Correlation Heatmap Maker
Reveal patterns and correlations in your data instantly
Turn raw data into a color-coded heatmap in seconds. Spot correlations, outliers, and trends at a glance — no design skills or coding required.
Everything You Need in a Heatmap Maker
Purpose-built controls for building clear, accurate correlation heatmaps
9 Color Schemes
Choose from Viridis, Plasma, Turbo, Reds, Blues, Greens, and more to match your brand or highlight specific patterns.
Custom Min/Max Colors
Set your own low and high value colors for precise, branded heatmaps that communicate exactly what you intend.
Cell Value Labels
Optionally display the numeric value inside each cell so readers can see exact figures alongside the color encoding.
Color Legend Control
Add a color scale legend in any position — top, bottom, left, or right — to help readers interpret the heatmap instantly.
Adjustable Cell Size and Gap
Fine-tune cell dimensions, border radius, and spacing to create dense or spacious heatmaps that fit your layout perfectly.
AI-Powered Generation
Describe your dataset in plain language and let the AI build a heatmap with the right structure, labels, and color mapping.
Bring Your Data Any Way You Like
Type It In
Enter row labels, column labels, and values directly into the simple data table.
Paste from Spreadsheet
Copy cells from Excel or Google Sheets and paste them straight into MakeCharts.
Upload a File
Import CSV or Excel files with your matrix data for instant heatmap generation (Pro).
Describe with AI
Tell the AI what correlations to visualize and get a ready-made heatmap in seconds.
Share Your Heatmap Everywhere
Download PNG or SVG
Export crisp, high-resolution heatmap images ready for slides, reports, and publications.
Share a Link
Generate a shareable link so colleagues and clients can view your heatmap instantly.
Embed on Your Site
Add your heatmap to any webpage with a simple embed code that stays up to date.
Use in Presentations
Drop your heatmap into PowerPoint, Google Slides, or Keynote with a single download.
About MakeCharts
MakeCharts turns raw data into clear, professional visuals in minutes. Our heatmap maker is part of a suite of 30+ chart types built for speed and simplicity. No installation, no design skills, no friction — just your data and a polished chart.
- ✓30+ chart types including heatmaps, scatter plots, bar charts, and more
- ✓AI-powered generation from plain-language descriptions
- ✓Free to start with no signup required
- ✓Export as PNG or SVG for any use case
- ✓Trusted by analysts, marketers, educators, and students worldwide
MakeCharts by the Numbers
From Data to Heatmap in 3 Steps
No design experience needed — just your data and a goal
Enter Your Data
Add row labels, column labels, and numeric values to the data table, or paste directly from a spreadsheet.
e.g. Products as rows, quarters as columns, revenue as values
Choose Your Colors
Select a color scheme like Viridis or Reds, then adjust cell size, gaps, and whether to show value labels.
e.g. Blues scheme with values shown and a bottom legend
Download or Share
Export your heatmap as a PNG or SVG, copy a shareable link, or embed it directly in your website.
e.g. Download PNG for a board presentation
Who Uses a Correlation Heatmap Maker
Heatmaps make complex multi-variable data immediately understandable
Track Performance Across Products and Periods
Visualize how revenue, margin, or growth varies across product lines and time periods with a single glance at color-coded cells.
Visualize Correlation Matrices Instantly
Plot correlation coefficients between variables to identify multicollinearity, strong predictors, and surprising relationships in your dataset.
Spot Channel and Campaign Patterns
Map engagement metrics across campaigns, audiences, and time periods to find what combinations drive the best results.
Communicate Research Findings Clearly
Present survey results, exam score distributions, or experimental data in a format that audiences understand without statistical training.
Templates
Start with professionally designed templates
Website Traffic Heatmap Template
Instantly reveal which pages drive the most engagement on which days, so you can optimize publishing schedules and content strategy with confidence.
Product Engagement Heatmap Template
Instantly reveal which features your users engage with most and when, so you can make smarter product decisions backed by clear visual data.
Correlation Heatmap Template
Instantly reveal relationships between multiple variables with a ready-to-use correlation heatmap that turns raw numbers into actionable color-coded insight.
Heatmap Template for Weekly Activity Patterns
Instantly reveal when activity peaks across days and time slots with a color-coded heatmap built for clarity.
Calendar Heatmap Template: Reveal Activity Patterns at a Glance
Instantly visualize how activity levels shift across months and weekdays using a color-coded calendar heatmap.
Weight Conversion Matrix Heatmap — Multi‑Unit clarity in one view
Visualize conversion factors between mg, g, kg, oz, lb, and t in a color‑coded matrix for fast, error‑free cross‑unit lookups.
View All Templates
Browse the full library to find more templates tailored to your chart.
MakeCharts vs. Traditional Heatmap Tools
See why teams switch from spreadsheets and BI tools to MakeCharts
Spreadsheets and BI Tools
- ✗Hours spent configuring conditional formatting rules
- ✗Rigid color schemes with no easy customization
- ✗No AI to generate heatmaps from a plain description
- ✗Exporting requires screenshots or complex workflows
- ✗Limited control over cell size, labels, and layout
- ✗Requires setup, licenses, or technical knowledge
MakeCharts Heatmap Maker
- ✓Heatmap ready in under 2 minutes
- ✓9 color schemes plus fully custom min/max colors
- ✓AI generates heatmaps from a plain-language description
- ✓One-click PNG or SVG download and embed code
- ✓Full control over cell size, gap, borders, and labels
- ✓Free to use — no signup or installation required
Frequently Asked Questions
What is a correlation heatmap maker?
A correlation heatmap maker is an online tool that turns numeric data into a color-coded grid where each cell's color represents a value magnitude. MakeCharts lets you build one in minutes without any design or coding skills — free and in your browser.
Is the heatmap generator free?
Yes — the core correlation heatmap maker is completely free with no signup required. You can create, customize, and download heatmaps at no cost. AI chart generation and CSV file uploads are available on paid plans.
How do I make a heatmap from a correlation matrix?
Enter your correlation coefficients as values with variable names as both row and column labels. Choose a color scheme like Plasma or set custom min/max colors to clearly show positive and negative correlations across the matrix.
What color schemes does the heatmap maker support?
MakeCharts includes 9 preset color schemes: Viridis, Plasma, Turbo, Reds, Blues, Greens, Greys, Oranges, and Purples. You can also enable custom colors to set your own minimum and maximum value colors for full brand control.
Can I show numeric values inside heatmap cells?
Yes. In the Display Settings panel, toggle on 'Show values in cells'. You can also adjust the value font size to keep the heatmap readable at any cell size — useful when presenting exact figures alongside color encoding.
Built for Everyone
- ✓No design background needed — intuitive controls guide you step by step
- ✓Works on any device: desktop, tablet, or mobile
- ✓Available in 12+ languages for global teams and classrooms
- ✓Free tier with no signup so anyone can start immediately
- ✓Simple enough for students, powerful enough for data scientists
Your Data, Your Control
- •Your chart data is used only to render your heatmap
- •We do not sell or share your data with third parties
- •You control what you publish or share publicly
- •Download your heatmap and delete your data at any time
- •No account required to create and download a heatmap
Build Your Correlation Heatmap Now
Free, instant, no signup required