QuickChart

Overview

QuickChart renders Chart.js charts as images — a URL with a Chart.js config returns a PNG/SVG chart. Keyless and free (verified live), it’s the standard way to embed charts in emails, READMEs, and server-generated images.

Quick Start

A bar chart (verified live):

curl "https://quickchart.io/chart?c=%7Btype%3A%27bar%27%2Cdata%3A%7Blabels%3A%5B%27a%27%2C%27b%27%5D%2Cdatasets%3A%5B%7Bdata%3A%5B1%2C2%5D%7D%5D%7D%7D"

(The c param is a URL-encoded Chart.js config object.)

Use the full config for rich charts:

{
  "type": "line",
  "data": { "labels": ["Jan", "Feb", "Mar"], "datasets": [{ "label": "Sales", "data": [3, 5, 2] }] },
  "options": { "title": { "display": true, "text": "Monthly Sales" } }
}

curl "https://quickchart.io/chart?c=<url-encoded-config>"

SVG output and other options:

curl "https://quickchart.io/chart?c=...&format=svg"
curl "https://quickchart.io/chart?c=...&width=800&height=400"

Authentication

None — keyless (a free API key removes the watermark and raises limits).

Rate Limits & Notes

• Free tier: 100 charts/day (no key); a free key raises it and removes the watermark.
• The config is standard Chart.js — any chart type (bar, line, pie, doughnut, radar…) works.
• Great for email reports (no JS in email clients) and server-side image generation.
• A config builder at quickchart.io helps generate the encoded c param.

FAQ

Is QuickChart free? Free tier: 100 charts/day; a free key raises limits and removes the watermark.

What chart library? Chart.js — pass any Chart.js config.

Why use it? Embed charts in emails/READMEs where JavaScript can’t run.