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Line Chart Maker

Plot one or more series from CSV or JSON data with smoothing, grid, markers, and PNG/SVG export

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What is Line Chart Maker

Written by Giorgos Kostas. Last reviewed:

A line chart shows how a single numeric value changes across an ordered dimension such as time, distance, or sequence. It is the default chart for spotting trends, seasonality, and anomalies.

Line Chart Maker parses your CSV or JSON, plots it in the browser with optional smoothing and markers, and exports PNG or SVG for reports, dashboards, and slides.

Why use it

  • Skip Excel or Chart.js setup when you just need a clean trend chart.
  • Paste directly from a SQL client, cron log, or monitoring export.
  • Toggle smoothing and grid to match your reporting style.
  • Export PNG or SVG without any server round-trip.

Features

  • CSV and JSON paste
  • Optional monotone smoothing
  • Grid and legend toggles
  • Axis label controls
  • PNG and SVG export
  • 5 color palettes
  • Client-side rendering

How to use Line Chart Maker

  1. Paste data. Paste an ordered label/value series as CSV or JSON.
  2. Pick options. Toggle smoothing, grid, and legend; set axis labels.
  3. Export. Download PNG for docs or SVG for vector-perfect embedding.

Example (before/after)

CSV input

label,value
Wk1,120
Wk2,152
Wk3,140
Wk4,188
Wk5,210
Wk6,245
Wk7,268

Rendered line chart

Line chart with 7 points from Wk1–Wk7 rising from 120 to 268, monotone smoothing, grid on, rendered as SVG ready for PNG export.

Common errors

Uneven time labels

Labels like Wk1, Wk2, Wk10 sort lexicographically and may display out of order.

Fix: Use zero-padded labels (Wk01, Wk02, Wk10) or an ISO date so ordering is natural.

Non-numeric value

A row has a value column that cannot be parsed as a number.

Fix: Strip units, thousand separators, or quotes from the value column.

FAQ

Can I plot multiple series?

This tool supports a single series per chart. For multi-series comparisons, run it multiple times and layer exported SVGs in your design tool.

How do I turn off smoothing?

Toggle the smooth-line switch in the settings panel to render straight line segments instead.

Is the rendering deterministic?

Yes. The same input always produces the same chart — the browser renders SVG directly from your data.

Related tools

Related chart builders and trend tools: You can also browse the full Chart Makers category for more options.

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