FormatFlow

No tool matches “”

Try a format (“webp”, “mp3”) or a verb (“merge”, “compress”).

PDF toolsImage toolsVideo toolsAll tools

Loading index

↵to open

Scientific Tools · Updated October 21, 2026 · Reviewed by FormatFlow Editorial

Experimental Data Plotter

You can plot experimental x, y data in your browser, add y error bars, fit a least-squares line, edit the chart title and axis labels, and export the result as SVG, PNG or cleaned CSV.

Runs in your browserFree · No sign-up · No watermark
X,Y → PLOT + FITRuns in your browser
Loading the tool…

Everything runs locally in this tab. No file is uploaded while the tool loads.

This tool runs in your tab. Nothing is uploaded and no copy is stored.

How files are handled

At a glance

Works with
X,Y → PLOT + FIT
Processing
In your browser
Price
Free, no account
Updated
October 21, 2026
All Scientific Tools

About Experimental Data Plotter

A table of numbers is hard to read a trend from, and a chart made in a spreadsheet often drifts out of step with the data. Plotting the values directly, with the units and labels you choose, keeps the figure honest and makes an outlier or a curved trend obvious before anyone draws conclusions.

This tool reads pasted CSV, TSV or space-separated rows, detects the delimiter and treats a third column as the error on y. Choose scatter, connected line or both, overlay a least-squares fit, relabel the chart, then export a vector SVG, a 2× PNG or the cleaned numbers as CSV. Everything runs locally.

What this tool does

The details that matter when you use Experimental Data Plotter for real work.

  • Delimiter detected automatically

    Paste comma, tab, semicolon or space-separated rows; the delimiter and an optional header row are recognised for you.

  • Scatter, line or both

    Switch between points, a line connecting the points in input order, and points with the connecting line.

  • Error bars from a third column

    Provide x, y, error rows and each point gets a vertical error bar sized from the measured uncertainty.

  • Least-squares fit toggle

    Overlay the best-fit straight line and read the equation, slope, intercept, r² and the number of points.

  • Editable labels and exports

    Set the chart title and both axis labels, then download a vector SVG, a 2× PNG or a cleaned CSV.

How to use Experimental Data Plotter

No account, no installation — the whole job happens in this browser tab.
  1. 01

    Paste the rows

    Put one x, y row per line, or x, y, error when you have uncertainty for each point; a header row is optional.

  2. 02

    Check the detected format

    The tool reports the column count and delimiter it detected so you can confirm the paste landed correctly.

  3. 03

    Choose a chart type

    Pick scatter for individual measurements, line for a trend in order, or scatter + line for both.

  4. 04

    Add the fit and labels

    Enable the least-squares fit and edit the chart title and axis labels; the plot updates as you type.

  5. 05

    Export the figure

    Download the chart as SVG or PNG, and the cleaned numeric rows as CSV for a report or repository.

How this tool works

Works with
X,Y → PLOT + FIT
Processing
Client-side, in your browser. Nothing is uploaded.
Requirements
Chrome, Edge, Firefox or Safari · JavaScript enabled

Limitations worth knowing

  • One data series per chart and up to 500 rows; multiple series and weighted fits are not supported.
  • Error bars are drawn from the third column but are not used to weight the least-squares fit.
  • Exports inherit the browser's fonts and rendering, so very long labels may need shortening before printing.

Privacy and file handling

The data you paste is parsed, plotted and exported with plain JavaScript inside your browser tab. Nothing is uploaded, logged or stored, and no request is made to a server while you work. Closing the page clears the data.

Read the full privacy policy

Experimental Data Plotter FAQ

Short, direct answers to the questions people ask before using this tool.
How many data rows can the plotter handle?
Up to 500 rows per figure. That covers most lab series and short time courses; larger data sets are better summarised or split before plotting.
What does the error column actually plot?
The third column is the y uncertainty for that point, drawn as a vertical error bar from y − error to y + error. It is not used in the least-squares fit, which weights every point equally.
Does the fitted line use the error bars as weights?
No. The fit is an ordinary least-squares line that treats all points equally. A weighted fit needs a different calculation and is outside this tool.
Can I plot more than one series in the same chart?
Not in this tool: one data series per chart. For standards and samples on one calibration line, use the standard curve calculator; for side-by-side series, export separate plots.
What is the difference between line and scatter + line?
Line connects the points in the order you pasted them and hides the markers; scatter + line shows the markers and the connecting line. Neither is a fitted line unless you enable the least-squares fit.
Which export format should I choose?
SVG stays sharp at any size and can be edited as vectors, PNG is convenient for slides and documents, and CSV gives you the parsed numbers with a header for further analysis.
Why do some points look compressed in the chart?
The axes scale to the full data range plus a small margin, so a value far outside the rest compresses the others. Check the row before removing it, and note that outliers also pull the least-squares line.
Are my data uploaded to a server?
No. The rows are parsed, plotted and exported with JavaScript in your browser; nothing is uploaded, stored or logged, and the downloads are generated locally.

Background reading

Format guides that explain the trade-offs behind Experimental Data Plotter.