Scatter Plot Generator
Upload a CSV or paste it directly to plot two numeric columns against each other — with the Pearson correlation coefficient and an ordinary least-squares trend line computed automatically alongside the points, not as an extra step. Optionally label points from a third column. Rows missing a numeric value in either column are skipped. Download the chart as a PNG. Runs entirely client-side using Recharts — nothing is uploaded.
Correlation (r)
0.995 (very strong)
Trend line
y = 4.830x + 49.133
Points plotted
10
About this tool
This tool plots two numeric columns against each other and, unlike a general-purpose chart generator, always computes the statistics that make a scatter plot useful for analysis: the Pearson correlation coefficient (r, from -1 to 1, measuring how strongly the two variables move together linearly) and an ordinary least-squares trend line (y = mx + b, the best-fit straight line through the points). Only rows where both the X and Y columns have a numeric value are plotted — a row missing either is skipped rather than plotted as zero. r close to ±1 means a strong linear relationship; close to 0 means little to none — though correlation, as always, doesn't imply causation. It runs entirely client-side using Recharts — nothing you upload or paste is ever sent anywhere.
What you can do
- Plot any two numeric columns against each other, with optional point labels
- Pearson correlation coefficient and a linear trend line, computed automatically
- Upload a .csv file, or paste CSV directly
- Download the chart as a PNG
- Nothing is uploaded — everything runs locally in your browser
How to use
Step 1
Add your CSV
Upload a .csv file, or paste it directly.
Step 2
Pick X and Y columns
Only genuinely numeric columns are offered. Optionally pick a label column to identify points.
Step 3
Read the correlation and trend line
Both are computed the moment you pick your columns — no extra step.
Example
This CSV:
CSV
hours_studied,exam_score 1,52 5,74 10,95
plots hours_studied against exam_score with a strong positive correlation and an upward-sloping trend line — more study hours associated with a higher score.
How your data is handled
This tool is labeled 🟢 Browser: your CSV is parsed and plotted directly in your browser using the Recharts library — nothing is uploaded to a server, and nothing about it is retained once you leave the page.
Frequently asked questions
What does the correlation coefficient (r) actually mean?+
It measures the strength and direction of a linear relationship between the two columns, from -1 (perfect negative — as one goes up, the other goes down exactly proportionally) through 0 (no linear relationship) to +1 (perfect positive). It only captures linear relationships — two variables can be strongly related in a curved, non-linear way and still show a low r.
Does a strong correlation mean one column causes the other?+
No — correlation measures how two variables move together, not why. Two variables can be strongly correlated because of a shared underlying cause, coincidence in a small sample, or genuine causation, and this tool can't distinguish between those.
How is the trend line calculated?+
Ordinary least-squares linear regression — the straight line that minimizes the sum of squared vertical distances from every point to the line. It's the same standard method spreadsheet software uses for a linear trendline.
Why are only some columns available to pick from?+
Only columns where every non-empty value parses as a number are offered for X and Y — a column with even one text value isn't treated as numeric.
Is my CSV uploaded anywhere?+
No — whether uploaded as a file or pasted, your CSV is parsed and plotted directly in your browser. Nothing here ever leaves your device.