Create Heatmaps Instantly
Turn matrix data into vivid, color-coded heatmaps in seconds.
Our free Heatmap Creator transforms rows and columns of numbers into clear visual patterns. Spot highs, lows, and trends at a glance — no spreadsheet expertise required.
Everything You Need in a Heatmap Maker
Powerful controls, beautiful defaults, and AI help — all in one free tool.
9 Built-in Color Schemes
Choose from Viridis, Plasma, Reds, Blues, Greens, Turbo, and more. Every palette is perceptually balanced for accurate data reading.
Custom Color Range
Pin your exact min and max colors to match your brand or highlight critical thresholds with precision.
Cell Value Labels
Toggle numeric values inside each cell so viewers get the exact figure alongside the color intensity — no guessing required.
Interactive Tooltips
Hover over any cell to surface the row label, column label, and value in a clean tooltip — perfect for presentations and embeds.
Flexible Legend Control
Position the color legend at the top, bottom, left, or right, or hide it entirely. Full control over label and value font sizes.
Cell Gap and Border Styling
Adjust cell size, spacing, border width, border color, and border radius to create the exact visual density your data demands.
Bring Your Data, Any Way You Like
Type It In
Enter row labels, column labels, and cell values directly into the data table — no file needed.
Paste from Spreadsheet
Copy a range from Excel or Google Sheets and paste it straight into the heatmap creator.
Upload CSV or Excel
Upload your data file and the heatmap generator maps your matrix automatically (Pro).
Describe with AI
Tell the AI what your data looks like and it builds a sample heatmap ready for your real numbers.
Share Your Heatmap Everywhere
Download as PNG or SVG
Export pixel-perfect heatmaps for slides, reports, dashboards, and social posts.
Share a Link
Get a shareable URL so teammates and clients can view your heatmap instantly.
Embed on Your Site
Drop a lightweight embed code into any website or CMS to keep your heatmap live (Plus/Pro).
Copy for Presentations
Paste directly into PowerPoint, Google Slides, or Notion with full resolution.
About MakeCharts Heatmap Creator
MakeCharts is a free online chart maker built for clarity and speed. The Heatmap Creator is one of 30+ chart types designed to turn raw data into instant visual insight. No installs, no templates to wrestle with — just your data and a finished heatmap.
- ✓Free to use with no account required
- ✓9 color schemes plus fully custom color ranges
- ✓AI-assisted generation from a plain-language description
- ✓Download as PNG or SVG, share via link, or embed on any site
- ✓Part of a 30+ chart toolkit covering every visualization need
- ✓Trusted by analysts, marketers, educators, and researchers worldwide
Heatmap Creator by the Numbers
How to Make a Heatmap
From raw data to a polished heatmap in three simple steps.
Add Your Data
Enter or paste your row labels, column labels, and cell values. Each data point maps to one colored cell in the grid.
Rows: Mon–Sun, Columns: 00:00–23:00, Values: visitor counts per hour
Choose Your Color Scheme
Select a built-in palette or set custom min/max colors. The heatmap creator instantly re-renders as you tweak settings.
Pick 'Blues' to show low-to-high engagement, or 'Turbo' for a vivid scientific look
Customize and Export
Adjust cell size, labels, legend position, and tooltips, then download your finished heatmap as a PNG or SVG.
Enable cell value labels for a dense data report, or hide them for a clean presentation slide
Who Uses the Heatmap Creator
Heatmaps reveal patterns that tables and bar charts miss — across every field.
Traffic and Engagement Patterns
Visualize website visits, click rates, or session durations by day of week and hour to find peak engagement windows and dead zones.
Revenue and Campaign Performance
Compare sales figures, email open rates, or ad performance across regions, products, and time periods to spot your best opportunities.
Correlation and Feature Analysis
Display correlation matrices, gene expression levels, or experimental results across conditions in a compact, readable grid.
Workforce and Resource Planning
Map staffing levels, ticket volumes, or equipment utilization across shifts and departments to optimize scheduling and resource allocation.
Templates
Start with professionally designed templates
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.
Heatmap Creator vs. Manual Methods
See why teams switch from spreadsheets to a dedicated heatmap maker.
Manual / Spreadsheet Approach
- ✗Conditional formatting breaks on copy-paste
- ✗No interactive tooltips or hover states
- ✗Limited to basic color scales
- ✗Hard to share without sending the whole file
- ✗Rebuilding from scratch every time data changes
- ✗No AI assistance for layout or color suggestions
MakeCharts Heatmap Creator
- ✓Instant rendering as you type or paste data
- ✓Interactive tooltips built in — no extra work
- ✓9 perceptually-balanced color schemes plus custom colors
- ✓Shareable link or embed code ready in one click
- ✓Re-upload or edit data and the heatmap updates live
- ✓AI generates a starter heatmap from a plain-language description
Heatmap Creator — Frequently Asked Questions
What is a heatmap and when should I use one?
A heatmap is a grid-based chart where each cell is colored to represent a numeric value — darker or more saturated colors indicate higher values. Use a heatmap when you want to compare values across two categorical dimensions simultaneously, such as sales by product and quarter, or web traffic by day and hour. They are especially powerful for spotting patterns, outliers, and correlations that would be invisible in a plain table.
Is the Heatmap Creator completely free?
Yes, the core heatmap creator is free with no sign-up required. You can create, customize, and download heatmaps at no cost. Paid plans unlock additional AI credits, CSV/Excel file upload, embed codes, and priority support.
How do I make a heatmap online with my own data?
Open the heatmap creator, then add your data points using the data table — each point needs a row label, a column label, and a value. You can type values manually, paste from a spreadsheet, or upload a file (Pro). Once your data is in, select a color scheme and download or share your finished heatmap.
Can I use the heatmap generator without coding?
Absolutely. The heatmap generator is a no-code, browser-based tool. Every setting — color scheme, cell size, labels, legend position — is controlled through plain-language menus and toggles. No programming, scripting, or design software is needed.
What color schemes are available in the heatmap maker?
The heatmap maker includes nine built-in palettes: Viridis, Plasma, Turbo, Reds, Blues, Greens, Greys, Oranges, and Purples. You can also enable custom colors to set your own hex values for the minimum and maximum ends of the scale, which is ideal for brand-matched or accessibility-focused designs.
Built for Everyone
- ✓No sign-up required — start building your heatmap immediately
- ✓Works in 12+ languages so your whole team can use it
- ✓Accessible on any device — desktop, tablet, or phone
- ✓Beginner-friendly controls with no learning curve
- ✓Free plan covers all core heatmap creation features
- ✓Designed for analysts, educators, marketers, and researchers alike
Your Data, Your Control
- •Your heatmap data is processed in your browser session
- •We do not sell or share your data with third parties
- •You decide what to publish — charts are private by default
- •Download and delete your work at any time
- •No trackers are used to profile your chart data
- •You retain full ownership of every heatmap you create
Ready to Create Your Heatmap?
Turn your matrix data into a polished, color-coded heatmap in under two minutes.