Line Chart Maker: Create Line Graphs Online From CSV Data
Need to show change over time or compare trends across segments? Paste a CSV, map the X and Y fields, choose whether the X axis is a date or category, then export the finished chart without leaving the page.
- Best for time series, KPI trends, cohort comparisons, product growth, and repeated measurements
- Works with tidy CSV or TSV data and can draw a single line or multiple lines from one table
- Exports the finished chart as PNG or SVG after you tune the style
What a line chart is and when to use one
A line chart connects data points in order so you can see direction, momentum, and change more quickly than in a raw table.
Use a line chart when the main question is about movement:
- how a metric changes over time
- whether one segment is growing faster than another
- where a trend accelerates, slows down, or reverses
- how repeated measurements compare across a shared sequence
If exact category totals matter more than trend shape, use a Bar Chart Maker. If you want filled trend bands, switch to an Area Chart Maker.
Which line chart setup should you choose?
| Setup | Best for | Data shape |
|---|---|---|
| Single line | One metric across time or ordered categories | date,value |
| Multi-series line chart | Comparing segments such as plans, regions, or products | date,series,value |
| Categorical X axis | Ordered labels like Q1, Q2, Q3 | text X column |
| Time-based X axis | Real dates and time stamps | ISO date strings like 2025-03-01 |
If your X values are real dates, set the X axis type to Date / time. If your X values are labels or phases, keep the X axis categorical and preserve the input order when needed.
Format your data for this line chart maker
The cleanest input is a tidy table with:
- one X axis column
- one numeric Y axis column
- one optional series column for multiple lines
Example:
date,plan,active_users
2025-01-01,Starter,120
2025-02-01,Starter,134
2025-01-01,Pro,88
2025-02-01,Pro,96If your source data has repeated points for the same X value, the tool can aggregate them with sum, average, or other summary rules. For adjacent workflows, see CSV to Chart, Scatter Plot Maker, Histogram Maker, and How to Make a Line Chart in Excel.
Common line chart mistakes
- Do not use a text column for the Y axis. The measured value needs to be numeric.
- Do not treat unordered categories as a time series. If the order matters, check your X axis type and sort setting.
- Do not cram too many lines into one chart when readers only need one comparison. Split the view or simplify the series list.
- Do not smooth lines aggressively unless the curve style matches the story you want to tell.
If your data is more about relationships between two numeric variables than change across sequence, use a Scatter Plot Maker instead.
FAQ
What is the best data format for a line chart maker?
The best format is tidy CSV or TSV with one X axis column, one numeric Y axis column, and an optional series column for multiple lines.
Can I create multiple lines in the same chart?
Yes. Add a categorical series column such as plan, region, or product, then map it to the series field in the settings panel.
Should I use a line chart or a bar chart?
Use a line chart when the main story is change or trend. Use a bar chart when the main story is comparing category totals at a single level.
Why does my line look out of order?
The most common causes are an X axis set to the wrong type, unsorted categorical labels, or date strings that are not in a consistent format.