May 17, 2026 4 min readFreeFlowCharts Team

Free Pie Chart Maker: Build Pie & Donut Charts Online

Create beautiful pie and donut charts free in your browser. Templates, custom colors, percentage labels, legend, and full API support. No signup required.

pie-chart donut-chart new-feature data-visualization api

Pie charts are one of the most recognizable data visualizations. They're perfect for showing proportions — market share, budget allocation, survey results. We've added a full pie chart editor to FreeFlowCharts with donut mode, auto-percentages, and API support.

What is a pie chart?

A pie chart is a circular graph divided into slices, where each slice represents a proportion of the whole. The angle of each slice is proportional to its value. A donut chart is the same thing with a hole in the center — it looks cleaner and leaves room for a summary label.

When to use a pie chart:

Showing proportions: — "Product A has 40% market share"

Budget breakdowns: — how spending is allocated across departments

Survey results: — agreement scales, preference distributions

Portfolio composition: — asset allocation, revenue by product line

When NOT to use a pie chart:

More than 7-8 categories (too many thin slices are unreadable)

Comparing values that are very close to each other

Time-series data (use a line chart instead)

How the editor works

Open freeflowcharts.app/piechart and pick a template or start from scratch. Each slice has a label, a numeric value, and a color. The editor calculates percentages automatically and renders them on the chart. Toggle "Donut style" in the sidebar for the hollow variant.

Click any slice on the chart or in the sidebar list to select it. The properties panel lets you edit the label, value, and color. Add or remove slices freely — the chart redraws instantly.

Templates

Market Share: — 4-slice example with Product A/B/C/Other

Budget: — 5-slice department breakdown

Survey Results: — 5-slice Likert scale (Strongly Agree → Strongly Disagree)

API support

Create pie charts programmatically:

curl -X POST https://freeflowcharts.app/api/create-piechart \
  -H "Content-Type: application/json" \
  -d '{"title":"Q1 Revenue","slices":[{"label":"Product A","value":40},{"label":"Product B","value":30},{"label":"Services","value":30}],"donut":true}'

The API auto-assigns colors, computes percentages, stores the chart, and returns a shareable link. Export via /api/export-piechart/json or /api/export-piechart/svg.

Constraints

Maximum 50 slices per chart

Slice values must be non-negative; total must be > 0

Label max 200 characters

Same 30 req/hr rate limit as all other endpoints

Try it at freeflowcharts.app/piechart. No account needed.