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Line graph maker

Free line graph maker: plot trends from label–value data, set title and axes, curve the line, and download a PNG. Runs locally in your browser.

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How to use

Follow these steps for a clear answer.

1

Enter ordered points

One line per point: Label, number—in the order they should appear on the X-axis.

2

Customize the chart

Set title and axes, then toggle curve, points, values, zero baseline, or grid.

3

Download or adjust

Save a PNG locally, or edit the data and redraw. Nothing is uploaded.

Line graph maker specification

Version 2.0.0 · Last reviewed 2026-07-28

Definition
A line graph plots ordered values as points connected by a line, making trends and changes over categories or time easy to see.
What it calculates
A scaled line chart from label–value pairs, with optional title, axis labels, curved path, point markers, value labels, zero-based or auto Y scale, grid, and max/min/average summary.
Inputs
  • One or more lines of Label, value (comma, colon, or tab separator)
  • Optional chart title, X-axis label, Y-axis label
  • Curved line, show points, show values, start Y from 0, grid toggles
Outputs
  • Canvas line chart preview
  • PNG download
  • Max, min, and average of the series
Formula
x_i = i / (n-1); y_i = (value_i - yMin) / (yMax - yMin)

Use the tool above to plot a line chart from plain text—with title, axes, optional curve, and PNG download.

When to use a line graph

Line graphs excel at trends over time or ordered stages (months, weeks, steps). Prefer a bar graph for side-by-side category comparisons, and a pie chart for part-to-whole shares.

Data tips

  • Separators: Jan, 12, Jan: 12, or tab-separated pairs all work.
  • Enter points in the order they should appear on the X-axis.
  • Decimals and negatives are supported on the Y scale.
  • Draft rows in the Online Notepad before pasting them here.

Customization

Control Effect
Chart title Drawn above the plot
X-axis / Y-axis Caption under or beside the plot
Curved line Smooths segments between points
Show points Draws markers on each value
Show values Prints each number near its point
Start Y from 0 Includes zero on the vertical scale
Grid lines Light horizontal guides
Download PNG Saves the current canvas locally
Assumptions
  • Each non-empty line provides one ordered point and one numeric value.
  • Points are drawn left to right in input order.
  • With Start Y from 0, the scale spans min(0, dataMin) to max(0, dataMax); otherwise it spans dataMin to dataMax.
  • Rendering and download run locally in the browser.
Units
  • Category / time label: text
  • Value: number (name units in the Y-axis label if needed)
Boundary conditions
  • Empty data shows a placeholder instead of a line.
  • A single point draws a marker without a connecting segment.
  • Very dense series may crowd X labels—6–12 points usually read best.
Example
Jan, 12 · Feb, 19 · Mar, 8 → three points scaled on Y from 0 to 19 when Start Y from 0 is on
Validation cases
  • Rising series 10 → 20 → 30 → Upward line; max 30
  • Start Y from 0 off, values 100–105 → Y scale zooms to ~100–105
  • Curved line on → Smoothed path between points
  • Show values on → Numeric labels above each point
Sources
  • Common line-chart practice (ordered categories vs magnitude)
  • Linear Y scale with optional zero baseline
Last reviewed
2026-07-28
Calculation version
2.0.0
→ Bar graph maker › → Pie chart maker › → Online Notepad › → Screenshot ›

Frequently asked questions

Key distinctions behind the tool.

Is this line graph maker free?

Yes. Create and download charts with no account and no upload—everything runs in your browser.

What data format does the line graph accept?

One point per line: a label, then a comma, colon, or tab, then a number. Example: March, 42. Keep labels in the order you want along the X-axis.

Can I download the chart as an image?

Yes. Use Download PNG to save the canvas as line-graph.png. You can also capture the page with the Screenshot tool.

Can I plot multiple lines on one chart?

This maker plots one series per chart. Build separate charts for additional series, or use a bar chart when comparing categories side by side.

What does Start Y from 0 do?

When enabled, the vertical axis includes zero so rises and falls stay in proportion. Turn it off to zoom the scale between your data’s minimum and maximum.

Is my data sent to a server?

No. Parsing, drawing, and PNG export stay on your device.