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Line Chart Maker — Free CSV to Line Graph, Browser-Based

Paste CSV, get a live line chart. Multi-series, smooth curve slider, PNG export. Free, runs in your browser.

Free No signup Client-side Privacy friendly Updated

How to use

  1. 1 Paste CSV — first row headers, first column is the X axis (labels), other columns become datasets.
  2. 2 Adjust the curve slider for a smoother or sharper line.
  3. 3 Download the rendered chart as PNG, ready for slides or docs.

Why use this tool

  • Powered by Chart.js, loaded lazily — page stays light until you scroll the preview.
  • RFC 4180 CSV parsing — quoted commas and embedded newlines handled correctly.
  • No upload — your data never leaves the browser.
  • Multiple series per chart — every numeric column becomes a separate line.

Frequently asked questions

Where can I get more chart types?

See the <a class="underline" href="/bar-chart-maker">Bar Chart Maker</a>, <a class="underline" href="/pie-chart-maker">Pie</a>, <a class="underline" href="/doughnut-chart-maker">Doughnut</a> and <a class="underline" href="/scatter-plot-maker">Scatter</a> tools — they all share the same CSV input shape.

What if my data is in JSON?

Convert it first with the <a class="underline" href="/csv-to-json">CSV ↔ JSON</a> converter, then paste the CSV here.

Why are some cells ignored?

Non-numeric cells in data columns become null. The first column is treated as a label string, all other columns must parse as numbers to plot.

What is Line Chart Maker?

A Line Chart Maker is a tool that turns pasted CSV data into a line chart directly in the browser. It plots one or more data series as connected points along an axis, offers a slider to smooth the curve between points, and exports the rendered result as a PNG image, with all processing happening client-side and nothing uploaded to a server.

Features

Multi-series line chart

Every numeric column after the first becomes a separate line dataset, each auto-coloured from a fixed 10-colour palette, all plotted on shared X-axis labels taken from column one.

Curve tension slider

A 0 to 0.6 range slider sets the Chart.js line tension (Bezier curve smoothing) live, from sharp straight segments (0) to a smoothed curve (0.6).

RFC 4180 CSV parsing

A dependency-free parser handles quoted fields, embedded commas, escaped double quotes, and CR/LF line endings; the delimiter (comma, semicolon, pipe, or tab) is auto-detected from the first line.

Client-side only, PNG export

Chart.js is lazy-loaded and rendering happens entirely in the browser canvas — no data leaves the device — and the result is downloaded as a PNG via canvas.toDataURL('image/png').

Example

Input

Month,Visitors,Signups
Jan,1200,80
Feb,1500,110
Mar,1800,150
Apr,2200,180
May,2700,260
Jun,3100,320

Output

line-chart-maker.png — two lines ("Visitors" in #10b981, "Signups" in #0ea5e9) plotted over 6 X-axis points (Jan–Jun), default curve tension 0.35, legend shown, rendered at the canvas's on-screen resolution and downloaded as a PNG data URL.

Common use cases

  1. 1

    Visualize time-series metrics for a report

    Paste monthly or weekly numbers (traffic, revenue, signups) with dates in the first column to get a multi-line trend chart ready to drop into a slide deck or document.

  2. 2

    Compare multiple series without a spreadsheet app

    Each additional CSV column plots as its own line on the same axes, useful for quickly comparing two or three related metrics side by side.

  3. 3

    Turn exported CSV data into a shareable image

    Export data from analytics tools, spreadsheets, or databases as CSV, paste it in, and download a PNG chart without installing charting software or writing code.

Summary

Line Chart Maker turns pasted CSV text into a Chart.js line chart in the browser: the first row is read as headers, the first column as X-axis labels, and every other numeric column becomes its own line series with a colour from a fixed 10-colour palette. It uses an RFC 4180-compliant hand-written CSV parser (no external CSV library) and lazily imports Chart.js 4.5.1 to render on a canvas, so the chart engine only loads once you use the tool. All parsing and rendering happen client-side — the CSV you paste is never uploaded to a server — and the finished chart is exported as a PNG via the canvas's toDataURL() method.

Category
Creator
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. Line Chart Maker runs entirely client-side — no server upload, no logging, no tracking of your input.

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