GitHub Contribution Chart Maker
Visualize your daily activity as a GitHub-style calendar heatmap.
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.
Everything You Need in a Calendar Heatmap Maker
Purpose-built controls for GitHub-style contribution charts — no bloat, no learning curve.
5 Color Palettes
Choose from Green, Blue, Orange, Purple, or Red intensity scales to match your brand or GitHub aesthetic.
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.
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 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.
- ✓Renders full-year calendar heatmaps from any date-value dataset
- ✓Five color palettes including a classic GitHub green
- ✓Adjustable cell size, radius, and gap for pixel-perfect output
- ✓Toggle month labels, day labels, tooltips, and legend independently
- ✓Export as PNG or SVG for READMEs, portfolios, and reports
- ✓AI generation available for instant sample or custom datasets
By the Numbers
How to Make a GitHub Contribution Chart
From raw data to a shareable calendar heatmap in three simple steps.
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.
2024-03-15, 12 | 2024-03-16, 4 | 2024-03-17, 0
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.
Green palette, 14px cells, month labels on, title: 'My 2024 Contributions'
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.
Save as PNG for your GitHub README or embed on your developer portfolio
Who Uses a GitHub Contribution Chart Maker
Calendar heatmaps turn daily activity into a compelling visual story across many fields.
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
Editorial Calendar calendar-heatmap Template for Smarter Publishing
This template visualizes daily publishing activity so you can track content volume, consistency, and scheduling patterns across the year.
Track Publishing Consistency with a calendar-heatmap
This template visualizes daily content activity over time so you can quickly spot publishing patterns, gaps, and peak output periods.
Academic Calendar calendar-heatmap for Smarter Term Planning
This calendar-heatmap visualizes daily academic activity across the school year so you can quickly spot busy periods, breaks, and important patterns.
View All Templates
Browse the full library to find more templates tailored to your chart.
MakeCharts vs. Manual Heatmap Tools
See why developers and creators choose MakeCharts for their GitHub contribution charts.
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
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
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.
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
Make Your GitHub Contribution Chart Now
Paste your data and get a polished calendar heatmap in under two minutes — free, no signup.