Image-Charts

Name: Image-Charts API
Brand: Image-Charts
Availability: InStock

✓ Official Vendor SpecMediaImage Processingnone2 EndpointsREST

For Agents

Render charts as PNG or SVG images by calling a single URL with chart type, data, and styling parameters - works in emails and PDFs.

Install Jentic One Beta

Connect the Image-Charts to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Image-Charts, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Image-Charts API.

Render bar, line, pie, radar, and other chart types as PNG or SVG via query parameters

Embed chart images in transactional emails where JavaScript is not allowed

Drop in as a replacement for legacy Google Image Charts URLs with the same parameter syntax

GET STARTED

Start building with Image-Charts API

Explore with Jentic

View OpenAPI Document

Use Cases

Patterns agents use Image-Charts API for, with concrete tasks.

★ Charts in Transactional Emails

Email clients block JavaScript, so interactive charts cannot run inline. Image-Charts solves this by rendering the chart as a PNG behind a URL that goes straight into an <img> tag. Marketing and product teams use it for weekly summary emails, billing reports, and onboarding nudges that include data visualisations.

Build a /chart URL with cht=bvg, chd=t:10,20,30, and chs=600x400, then put it in an <img src> tag inside the email template.

Google Image Charts Migration

Google deprecated Image Charts but many legacy systems still build chart URLs with its parameter syntax. Image-Charts re-implements the same surface, so swapping the host in existing URLs restores chart rendering without rewriting the parameter builder. This is a low-risk fix for old reporting pipelines.

Replace https://chart.googleapis.com/chart in existing URLs with https://image-charts.com/chart and verify the rendered image matches the expected output.

Server-Rendered Chart.js for PDFs

PDF generation pipelines that use headless Chrome can be slow when many charts are rendered per document. Calling /chart.js/2.8.0 with a Chart.js config returns a ready-made image, removing the headless render step. Document services use this to keep PDF generation under per-job time budgets.

Send a Chart.js config as a query parameter to /chart.js/2.8.0 and embed the returned PNG into the PDF template.

Agent-Generated Chart Embeds

An AI agent producing a Slack or email summary can include a chart by asking Jentic for the Image-Charts URL builder, supplying the data and chart type, and embedding the resulting URL in the message. Because the API requires no auth, Jentic returns the operation schema and the agent calls it directly without any credential handling.

Search Jentic for 'render a bar chart as a PNG', execute the /chart operation with cht, chd, and chs, and place the returned URL in the agent's reply.

Key Endpoints

2 endpoints — image-charts renders charts as static images directly from a url.

METHOD

PATH

DESCRIPTION

GET

/chart

Render a chart as a PNG or SVG image

GET

/chart.js/2.8.0

Render a Chart.js v2.8.0 configuration as an image

GET

/chart

Render a chart as a PNG or SVG image

GET

/chart.js/2.8.0

Render a Chart.js v2.8.0 configuration as an image

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Image-Charts has no required credentials on the public endpoints, so there is nothing for Jentic to vault. If a signing key is added later, it would be stored encrypted and injected at execute time.

Intent-based discovery

Agents search by intent (e.g., 'render a bar chart as a PNG') and Jentic returns the /chart or /chart.js operation with its parameter schema, so the agent fills in chart type, data, and size without reading docs.

Time to first call

Direct Image-Charts integration: a few hours to build the URL parameter helper. Through Jentic: a few minutes - search, load schema, execute and embed the URL.

FAQs

Specific to using Image-Charts API through Jentic.

What authentication does the Image-Charts API use?

The two public endpoints do not require authentication. Image-Charts offers paid plans that issue a signing key for higher rate limits, but the OpenAPI spec exposed here covers the unauthenticated /chart and /chart.js/2.8.0 surface.

Can I render Chart.js configurations as images with this API?

Yes. GET /chart.js/2.8.0 accepts a Chart.js v2.8.0 configuration and returns a server-rendered image. Use it when a PDF or email pipeline needs a chart image without running headless Chrome.

Is Image-Charts a true replacement for Google Image Charts?

Image-Charts re-implements the Google Image Charts URL parameter syntax (cht, chd, chs, etc.) on /chart, so replacing the host in existing URLs restores rendering for most chart types.

How do I render a chart through Jentic?

Run pip install jentic, search for 'render a bar chart as a PNG with Image-Charts', load the /chart operation schema, and execute with the chart type, data, and size parameters. The returned URL can be embedded directly in HTML or markdown.

Is the Image-Charts API free?

There is a free tier for low-volume use. Higher request volumes and watermark removal require a paid plan from image-charts.com - the OpenAPI spec itself does not cover billing.