Platemark

Free line chart maker

Paste dates and numbers, get a clean line chart. Add columns for more lines. No signup.

One row per label. The first column is the label, each other column is a series.

A sample line chart made with Platemark

The free chart has a small "Made with Platemark" tag in the corner.

Making charts from code or an AI agent?

Send the same numbers to the API and get a PNG plus a link that works for a year, ready for an email, a report or Slack. AI agents can call the render_chart tool on our MCP server. 100 free credits a month, a chart is 1.

curl https://platemark.rowhousesoftware.com/v1/charts -H "Authorization: Bearer pm_..." -H "Content-Type: application/json" \
  -d '{"type":"line","title":"Weekly signups","labels":["Jan","Feb","Mar"],"values":[12400,15800,14200]}' > chart.png

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