Chart-Output — Chart.js to PNG, SVG, WebP & PDF API

Features

Ship chart images anywhere JavaScript can't run

via api

Send a config. Get an image.

Any Chart.js config, posted as JSON. The response is your rendered file — PNG, SVG, WebP, or PDF. No browser to spin up, no server to maintain. One endpoint, every language.

const res = await fetch("https://api.chart-output.com/v1/render", {
  method: "POST",
  headers: { "Authorization": "Bearer co_live_..." },
  body: JSON.stringify({ type: "bar", data: chartData }),
});
const png = await res.arrayBuffer(); // → image/png

for email

Charts that render in every inbox

Every major ESP — Gmail, Outlook, Apple Mail, HubSpot, Customer.io — renders a plain <img> tag. Use your Chart-Output URL as the src. No JavaScript, no rendering quirks, no broken charts in Outlook.

chart studio

Start from a template. Ship something polished.

30 production-ready Chart.js templates across dark, light, and brand-neutral styles. Pick one, drop in your data, copy the API snippet. No design work required.

Browse Chart Studio templates

brand kits

Every chart inherits your brand automatically

Define your colors, fonts, and logo once as a brand kit. Reference it by ID on any API call — emails, reports, Slack digests, dashboards — and every chart renders consistently, without touching the config again.

performance

133ms typical render time

Fast enough to call inline on a server route without slowing your response. Render on-demand or pre-generate and cache — either works.

output formats

PNG, SVG, WebP, and PDF

One chart config renders to four formats. Switch per request without changing anything else. Retina 2× is included on all plans. PDF is available on Pro and Scale.

How it works

Three steps. Any stack.

1

POST your config

Send any Chart.js JSON to /v1/render. The API returns the image file directly — no polling, no callbacks, no second request.

2

Use the URL anywhere

Drop it into an <img> tag in an email template, a Slack message, a PDF generator, or an automation workflow. No JavaScript needed at the destination.

3

Scale without managing infrastructure

Chart rendering is CPU-intensive at volume. We run the renderer so you don't spin up headless Chrome, manage canvas dependencies, or debug memory leaks at 3am.

Compare

The chart image API that goes further

QuickChart and Chartly are rendering pipes. You send JSON, you get an image. That's where they stop. Chart-Output adds the layer every developer actually needs.

	Chart-Output	QuickChart Pro	Chartly Starter
Price	$19/mo	$40/mo	~$38/mo
Renders	50,000 · $19/mo	100,000 · $40/mo	100,000 · ~$38/mo
PDF output	✅ Pro+	❌ Enterprise only	❌ None
WebP output	✅ All plans	❌	❌
Brand kits	✅ All plans	❌	❌
Chart Studio templates	✅ 30 free	❌	❌
Webhooks	✅ Pro+	❌	❌
Custom domain	✅ Pro+	❌ Enterprise only	❌
Uptime SLA	✅ 99.9%	❌ Pro has none	❌
USD pricing	✅	✅	❌ GBP only

Migrating from QuickChart? Your existing Chart.js configs work without modification. Swap the endpoint, add your API key, done. See the migration guide →

Pricing

Pricing that doesn't punish growth

Pay for renders, not seats. Brand kits, all chart types, and full API access included on every plan — nothing held behind enterprise paywalls.

Trial

14 days. 1,000 renders. Everything unlocked.

$0

14 days · 1,000 renders

Includes

All chart types
PNG, SVG, WebP
Brand kits
Chart Studio access
Full API access
No watermarks
No credit card required

Start free — no card needed →

Starter

Chart images from Chart.js without the runtime

Drop into your existing stack