Full Year at a Glance
Lay out an entire year of daily data on a compact grid so patterns, streaks, and gaps are immediately obvious.
Chart & Visualization Tools
Activity Heatmap Maker
Paste your date-value data and generate a calendar heatmap instantly. Perfect for tracking activity streaks, contribution history, or any daily metric over time.
Features
Everything You Need in a Calendar Heatmap Maker
Powerful customization, zero design experience required.
5 Color Palettes
Choose from Green, Blue, Orange, Purple, or Red intensity scales to match your brand or highlight different metrics.
Adjustable Cell Style
Control cell size, corner radius, and gap spacing to create everything from tight contribution grids to spacious daily logs.
Month and Day Labels
Toggle month and weekday labels on or off so your calendar heatmap is always readable in any context.
Hover Tooltips
Readers can hover over any cell to see the exact date and value — great for interactive reports and embeds.
Color Legend
An automatic Less-to-More legend tells viewers exactly what the intensity scale means without any manual annotation.
Data input
Bring Any Daily Data
Type or Paste
Enter date-value pairs directly or paste rows from a spreadsheet in seconds.
Bulk Input
Drop in dozens of entries at once using the bulk input panel — one date per line.
AI Generation
Describe your dataset in plain language and let AI populate your calendar heatmap.
Upload Files
Import CSV or Excel files with date columns directly into your heatmap (Pro).
Share
Share Your Heatmap Anywhere
Download as Image
Export a high-resolution PNG or SVG perfect for reports, slides, or social posts.
Share a Link
Generate a shareable URL so anyone can view your activity heatmap instantly.
Embed on Your Site
Copy a one-line embed code and display your calendar heatmap on any webpage (Plus+).
Add to Presentations
Drop your heatmap image into PowerPoint, Google Slides, or Notion effortlessly.
About MakeCharts Activity Heatmap Maker
MakeCharts is a free online chart maker built for speed and clarity. The activity heatmap maker lets anyone transform raw daily data into a polished calendar heatmap without code or design tools. Trusted by developers, marketers, educators, and analysts worldwide.
<2 minTime to first heatmap
500k+Charts created
5Color palettes
12+Languages supported
NoneSign-up required
Workflow
How to Make a Calendar Heatmap
Add Your Date-Value Data
Type entries manually, paste from a spreadsheet, or use bulk input to drop in a full dataset at once.
Customize Appearance
Pick a color palette, set cell size and radius, toggle labels and the legend until the heatmap looks exactly right.
Export or Share
Download a high-res image, copy a shareable link, or grab the embed code to publish your heatmap anywhere.
Use cases
Who Uses an Activity Heatmap Maker
Visualize Contribution History
Recreate GitHub-style contribution graphs to track commits, deployments, or code reviews over a full year.
Track Habits and Workouts
Map workout sessions, meditation streaks, or sleep scores day-by-day to celebrate consistency and spot regressions.
Audit Publishing Consistency
Visualize how often you publish blog posts, social content, or newsletters across the calendar year to identify gaps.
Study and Learning Logs
Students and researchers use calendar heatmaps to track daily study hours, data collection runs, or reading sessions.
Templates
Start with professionally designed templates
Academic Calendar calendar-heatmap for Smarter Term Planningcalendar-heatmap
Visualize term workload, breaks, and peak academic dates fast with a professional Academic Calendar Template calendar heatmap.
Track Publishing Consistency with a calendar-heatmapcalendar-heatmapVisualize publishing activity fast with a Content Calendar Template. Spot gaps, track consistency, and create a professional heatmap in minutes.
Editorial Calendar calendar-heatmap Template for Smarter Publishingcalendar-heatmapVisualize publishing activity fast with this Editorial Calendar Template. Spot gaps, peak days, and content cadence in a clear calendar heatmap.
Related Tools
Create similar charts with these tools
Calendar Heatmap Makercalendar-heatmap
Build a calendar heatmap in seconds. Visualize daily activity, habits, or contributions by date — no coding or design skills required. Free forever.
Content Calendar Heatmapcalendar-heatmapPlan and visualize your content schedule with a calendar heatmap. Map posting frequency, track consistency, and spot gaps in your content strategy instantly.
GitHub Contribution Chart Makercalendar-heatmapCreate a GitHub contribution chart in seconds. Visualize daily activity as a calendar heatmap — customize colors, export, and share instantly. No signup needed.
Track Habits with a Heatmapcalendar-heatmapBuild your habit tracker calendar heatmap in seconds. Visualize daily streaks, consistency scores, and yearly progress patterns — free, no signup required.
Comparison
Activity Heatmap Maker vs. Doing It Manually
See why teams choose MakeCharts over spreadsheets and custom scripts.
MakeCharts Activity Heatmap Maker
- Ready-to-use calendar heatmap in under 2 minutes
- 5 polished color palettes — one click to switch
- Shareable link and embed code built in
- Paste new data and the chart updates instantly
- Hover tooltips included by default
- Consistent, professional output every time
Spreadsheets or Custom Code
- Hours of conditional formatting or D3 scripting
- Color scales are tedious to configure manually
- Hard to share or embed outside your environment
- Updating data means rebuilding the chart
- No interactive tooltips without extra development
- Styling is inconsistent across tools
FAQ
Frequently Asked Questions
What is an activity heatmap maker?
An activity heatmap maker is an online tool that turns date-value data into a calendar heatmap — a grid where each cell represents one day and color intensity shows how active or high that day was. MakeCharts lets you build one in minutes with no coding.
What is a calendar heatmap?
A calendar heatmap lays days out in a week-by-week grid across months, coloring each day by a numeric value. It is the same format used by GitHub for contribution graphs. It makes streaks, gaps, and seasonal patterns instantly visible.
How do I make a calendar heatmap for free?
Open MakeCharts, select the Calendar Heatmap chart type, enter your date-value pairs in the data panel, then customize colors and labels. Download or share your finished heatmap at no cost — no account required.
Can I create a GitHub-style contribution graph?
Yes. Set the color palette to Green, enter your daily commit counts as date-value pairs, and enable the color legend. The result is a familiar GitHub-style contribution graph you can download or embed anywhere.
What date format should I use?
Use the ISO format YYYY-MM-DD (for example 2024-06-15). The bulk input panel accepts one entry per line in 'date, value' format, making it easy to paste directly from a spreadsheet.
Can I customize the colors of my activity heatmap?
Yes. Choose from five intensity palettes — Green, Blue, Orange, Purple, and Red. You can also set the empty-cell color to match your background or branding.
How do I embed a calendar heatmap on my website?
With a Plus or Pro plan, MakeCharts generates an embed code you can paste into any HTML page. The heatmap renders responsively and includes interactive tooltips for your visitors.
Is there an AI activity heatmap maker?
Yes. Describe your dataset in plain language — for example 'daily sales for 2024' — and the AI will generate realistic data and build a calendar heatmap automatically. You can then edit any value to replace it with your real numbers.
What file formats can I export?
Free users can download PNG images. Plus and Pro users can also export SVG for lossless scaling, ideal for presentations, print materials, or web use.
How many data points can a calendar heatmap show?
A full year contains 365 daily cells, which MakeCharts handles smoothly. You can display any continuous date range — a single month for a focused view or multiple years for long-term trend analysis.
Built for Everyone
- No design skills needed — sensible defaults get you a great-looking heatmap instantly
- Works on desktop, tablet, and mobile browsers without installation
- Available in 12+ languages so your team can work in their own language
- Free tier includes all calendar heatmap features with no hidden limits
- Simple enough for students, powerful enough for data analysts and developers
Your Data Stays Yours
- Data you enter is used only to render your chart — we do not sell it
- No account required to create and download a calendar heatmap
- You control what you share; unshared charts are private by default
- Download or delete your charts and account data at any time
- We do not use your chart data to train AI models without your consent
Start now
Ready to Visualize Your Daily Activity?
Create a calendar heatmap in under 2 minutes — free, no sign-up needed.
- Free forever
- No sign-up required
- Download as PNG or SVG
- AI-assisted data generation
- Shareable link included
No sign-up needed. Your heatmap is ready in seconds.