5 Color Palettes
Choose from Green, Blue, Orange, Purple, or Red intensity scales to match your brand or GitHub aesthetic.
Chart & Visualization Tools
GitHub Contribution Chart Maker
Paste your date-value data and generate a polished contribution heatmap in seconds. Customize the color palette, cell size, and labels — then download or share instantly.
Features
Everything You Need in a Calendar Heatmap Maker
Purpose-built controls for GitHub-style contribution charts — no bloat, no learning curve.
Adjustable Cell Size and Gap
Fine-tune cell size, radius, and spacing so your heatmap looks crisp at any export resolution.
Month and Day Labels
Toggle month and weekday labels on or off to keep the chart clean or fully annotated.
Interactive Tooltips
Hover over any cell to see the exact date and contribution count — great for presentations and demos.
Color Legend
Display a 'Less / More' legend below the chart so readers instantly understand intensity levels.
AI Chart Generation
Describe your coding activity in plain language and get a fully populated GitHub contribution chart in one click.
Data input
Add Your Activity Data Your Way
Type or Paste
Enter date-value pairs directly or paste rows from a spreadsheet in seconds.
Bulk Input
Drop in a list of dates and counts all at once using the bulk input panel.
Upload a File
Import a CSV or Excel file with your daily activity data for instant rendering (Pro).
AI-Generated Data
Describe your activity pattern and let AI populate a realistic contribution dataset for you.
Share
Share Your Contribution Chart Anywhere
Download as PNG or SVG
Export your calendar heatmap as a high-resolution image for portfolios, READMEs, and slides.
Share a Link
Get a shareable URL to send your GitHub contribution chart to anyone instantly.
Embed on Your Site
Drop an embed code into your personal site or developer portfolio with one click (Plus+).
Add to Presentations
Paste your polished heatmap directly into Google Slides, Notion, or any deck.
About This Tool
The MakeCharts GitHub Contribution Chart Maker turns date-value data into a clean calendar heatmap with no code. Inspired by GitHub's iconic contribution graph, it works for any daily metric — commits, habits, or business activity. Customize colors and layout, then export or share in seconds.
<2 minTime to first chart
5+Color palettes
10k+Charts created
12+Languages supported
NoneSignup required
Workflow
How to Make a GitHub Contribution Chart
Enter Your Activity Data
Type or paste date-value pairs — one per line in YYYY-MM-DD, value format. Use bulk input for large datasets or let AI generate sample data.
Customize the Heatmap
Pick a color palette, adjust cell size and gap, toggle month or day labels, and add a chart title. The preview updates live as you edit.
Export and Share
Download your GitHub contribution chart as a PNG or SVG, copy the share link, or grab an embed code for your portfolio or website.
Use cases
Who Uses a GitHub Contribution Chart Maker
Developer Portfolio and README
Showcase your coding consistency and open-source activity with a GitHub-style contribution chart embedded in your README or personal site.
Publishing Consistency Tracker
Bloggers and newsletter writers use calendar heatmaps to visualize their publishing cadence and identify gaps in output over the year.
Habit and Workout Heatmap
Turn daily habit logs — workouts, meditation, or reading — into a motivating GitHub-style contribution chart that makes streaks visible.
Daily Metric Activity Map
Analysts and PMs use calendar heatmaps to reveal patterns in daily metrics — sales, support tickets, signups — at a glance.
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.
Activity Heatmap Makercalendar-heatmapCreate a calendar heatmap in seconds. Visualize daily activity, habits, or contributions across weeks and months — free, no sign-up required.
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
MakeCharts vs. Manual Heatmap Tools
See why developers and creators choose MakeCharts for their GitHub contribution charts.
MakeCharts GitHub Contribution Chart Maker
- Paste data and get a heatmap in under 2 minutes
- Automatic date-to-grid mapping — no math needed
- Live preview updates with every change
- One-click PNG or SVG export, always crisp
- 5 color palettes with point-and-click control
- Instant shareable link or embed code — no hosting
Coding It Yourself or Using Spreadsheets
- Hours writing D3 or Chart.js boilerplate
- Manual date parsing and grid layout math
- No live preview — guess and recheck
- Exporting images requires extra libraries
- Hard to customize colors without code changes
- Sharing requires hosting the chart yourself
FAQ
Frequently Asked Questions
What is a GitHub contribution chart maker?
A GitHub contribution chart maker is a tool that takes date-value data and renders it as a calendar heatmap — the same grid of colored squares GitHub uses to show daily commit activity. MakeCharts lets you build one for any dataset, not just code commits, with no coding required.
How do I create a GitHub contribution chart with my own data?
Open the MakeCharts calendar heatmap tool, enter your dates and values in YYYY-MM-DD, value format, and the chart renders instantly. You can type entries one by one, paste a bulk list, or upload a CSV file (Pro). Customize colors and labels, then export or share.
Can I use this as a free GitHub contribution chart maker?
Yes. The core calendar heatmap tool is free with no account required. You can enter data, customize the chart, and download it as an image at no cost. AI-assisted chart generation and advanced export options are available on paid plans.
What color palettes are available for the contribution heatmap?
MakeCharts offers five intensity-based palettes: Green (GitHub-style), Blue, Orange, Purple, and Red. Each palette shades cells from light (low value) to dark (high value), making activity density immediately visible.
Can I embed my contribution heatmap on a website or GitHub README?
Yes. On Plus and Pro plans you can generate an embed code and paste it into any website. For static use in a GitHub README, export the chart as a PNG and add it as an image file to your repository.
Does the calendar heatmap support any date range?
Yes. You can add entries for any dates you need — a single month, a full year, or multiple years. The chart automatically lays out weeks into a calendar grid based on the date range of your data.
What is the data format for the calendar heatmap bulk input?
Each line should contain a date and a numeric value separated by a comma, for example: 2024-01-15, 8. Dates must be in YYYY-MM-DD format. You can paste as many rows as needed into the bulk input panel and apply them all at once.
Can I use AI to generate a GitHub contribution chart?
Yes. Describe the kind of activity pattern you want — such as a developer with high commit volume on weekdays and occasional weekend work — and the AI will populate a realistic dataset and render the heatmap for you. Free accounts include a limited number of AI credits.
How is a calendar heatmap different from a standard bar or line chart?
A calendar heatmap encodes values as color intensity in a date-grid layout, making it ideal for spotting streaks, gaps, and seasonal patterns in daily data. Bar and line charts are better for comparing totals or showing trends over time but do not reveal the calendar structure as clearly.
Can I track habits or workouts with this contribution chart tool?
Absolutely. Any dataset with a date and a numeric value works — workout sessions, words written, miles run, or books read. The GitHub-style calendar heatmap makes it easy to see your consistency and celebrate streaks over any time period.
Built for Everyone
- No coding or design skills required — just paste your data
- Works on desktop, tablet, and mobile browsers
- Available in 12+ languages for a fully localized experience
- Free tier gives full access to the calendar heatmap with no signup
- Simple controls designed for beginners, with depth for power users
Your Data Stays Yours
- Chart data is processed in your browser session and not stored permanently
- We do not sell or share your data with third parties
- You control which charts are public and which are private
- Delete your account and data at any time from your settings
- No tracking beyond standard analytics used to improve the product
Start now
Make Your GitHub Contribution Chart Now
Paste your data and get a polished calendar heatmap in under two minutes — free, no signup.
- Free calendar heatmap — no signup required
- 5 color palettes including GitHub green
- Instant PNG and SVG export
- AI chart generation with free credits
- Share link or embed code in one click
No signup required. Free calendar heatmap with instant preview.