Line graphs turn a column of numbers into a story: growth, decline, seasonality, the moment everything changed. This line graph maker builds that story in your browser with smooth or straight lines, multiple series, and typography that looks deliberate rather than default.
Nothing is uploaded, nothing requires a login, and the result exports as a sharp PNG or a vector SVG that scales to any size.
How to make a line graph online
- Add your time points. Each row is one point on the x-axis: months, years, weeks, dates. Type them in order, or paste the whole range from Excel or Google Sheets.
- Add one line per series. Each column after the first becomes its own line: add “2025” and “2024” columns to compare years, or one column per product, team, or country.
- Tune the look. Choose smooth curves or straight segments, pick a palette, add axis labels and a subtitle with your units, and decide whether readers need value labels or just the shape.
- Export and share. Download as PNG or SVG, copy the image to your clipboard, or copy a share link; the entire chart travels inside the URL, no server involved.
When should you use a line graph?
Reach for a line graph whenever your x-axis is ordered and continuous: time, temperature, dosage, distance. The connected line tells readers the values belong to one evolving thing, which is exactly what bars can’t say.
Multiple lines excel at comparing trajectories: this year against last year, product A against product B. Two or three lines are instantly readable; five is a practical maximum before the chart becomes spaghetti.
If the area under the curve carries meaning (cumulative revenue, total users), consider an area chart instead. If your categories are unordered (countries, flavors, teams), a bar chart is the honest choice.
Quick tips for a chart people trust
- Keep time flowing left to right and at even intervals; skipping years distorts the slope.
- Smooth curves look great for organic trends, but switch to straight lines for precise measurements.
- Label your units in the subtitle (“in thousands of sessions”) so the y-axis can stay clean.
- Unlike bar charts, a line graph’s axis doesn’t have to start at zero: zoom to the range where the action is, and say so.
Frequently asked questions
How many lines can one graph have?
The editor supports up to eight series, each with its own color from the palette. For readability, three to five lines is the sweet spot; beyond that, consider splitting into small multiples or highlighting one line against gray context lines.
Can I make the lines smooth?
Yes. “Smooth curves” is on by default and uses monotone interpolation: curves bend gently but never overshoot your actual data points, so the chart stays truthful. Toggle it off for straight segments.
Can I use dates on the x-axis?
Yes: your labels are free text, so “Jan 2025”, “2025-01”, “Week 3” all work. Points are spaced evenly in label order; when labels get crowded, the chart automatically shows every second or third one.
What if I have missing data points?
Leave the cell empty. Missing values are treated as gaps in your data rather than zeros, so a blank month won’t drag your line down to the floor and ruin the trend.
Can I download the graph for PowerPoint?
Yes: “Download PNG” exports at double resolution, which stays sharp on projectors and retina screens. Or click “Copy image” and paste directly into your deck without touching a file.