Chart Builder

About Chart Builder

Chart Builder is a free online tool for creating beautiful, interactive charts from CSV or JSON data. Choose from multiple chart types (bar, line, pie, doughnut, radar, polar area), customize colors and settings, and download as PNG images—all processed locally in your browser for complete privacy.

What chart types are supported?

Chart Builder supports 6 popular chart types:

1. Bar Chart - Compare values across categories
2. Line Chart - Show trends over time
3. Pie Chart - Display proportions and percentages
4. Doughnut Chart - Like pie chart with center hole
5. Radar Chart - Compare multiple variables
6. Polar Area Chart - Show proportions with equal angles

Each chart type automatically adapts to your data structure and chosen color theme.

What data formats can I use?

You can input data in two formats:

1. CSV (Comma-Separated Values):
- First row must contain headers
- First column becomes chart labels
- Additional columns become data series

2. JSON (JavaScript Object Notation):
- Must be an array of objects
- First property becomes labels
- Additional properties become data series

Both formats support multiple data series for comparison charts.

How do I structure my data?

Your data should have at least 2 columns:

1. First column: Labels (e.g., Month, Category, Product)
2. Other columns: Numeric values (e.g., Sales, Expenses)

Example CSV:
Month,Sales,Profit
Jan,5000,1000
Feb,6000,1500

The tool automatically uses the first column for X-axis labels and creates separate series for each remaining column.

Can I customize chart appearance?

Yes! Customize your charts with:

- Color Themes: Default, Pastel, Vibrant, Monochrome
- Chart Title: Add custom title text
- Legend: Show/hide data series legend
- Grid Lines: Show/hide background grid (bar/line charts)
- Animation: Enable/disable chart animations

All customizations update in real-time when you regenerate the chart.

Does my data leave my device?

No. All chart generation happens entirely in your browser using JavaScript. Your data never leaves your machine, ensuring complete privacy for sensitive business data, financial reports, or confidential analytics.

How do I save my chart?

After generating a chart, click the 'Download PNG' button to save it as a high-quality PNG image. The image includes all your customizations (colors, title, legend) and can be used in:

- Presentations and reports
- Websites and blogs
- Documentation
- Social media posts

The downloaded image maintains full resolution for professional use.