Is the plot digitizer free?

Yes. It is free to use, does not require a signup, and does not add a watermark to exported data.

Does my image get uploaded to a server?

No. Axis detection, curve tracing, and CSV generation happen in your browser.

What types of figures can I digitize?

The tool works best for 2D plots, line graphs, scatter plots, step plots, and charts with visible axes and tick marks.

Can it extract multiple series from one graph?

Yes. Add a series for each curve, pick its color, trace it, and export a CSV with a series column.

Are log axes supported?

Yes. Calibrate two tick values on each axis, then enable Log X or Log Y before tracing.

How accurate is the extracted data?

Accuracy depends on image quality, calibration, and line contrast. Use auto-detect first, then move the calibration points if needed.

Free ToolNo signup required

Free Plot Digitizer

Extract x-y data from plot, graph, chart, and figure images. Upload a screenshot, calibrate the axes, trace one or more series, and download clean CSV data in your browser.

✓Your data never leaves your browser.✓Linear and log axes✓Multi-series CSV export

Drop a graph image to digitize

Upload a scientific plot, chart, or scanned figure. Then calibrate the axes and extract the underlying numbers.

PNG · JPG · BMP · WEBP · GIF · SVG

100%

How to digitize a plot

1
Load your image
Drag and drop, or browse for a PNG, JPG, or screenshot. The image stays in your browser.
2
Calibrate the axes
Enter the tick values shown on the figure.
3
Trace the data
Pick a series color and trace it automatically, or add points by hand when the image is messy.
4
Download CSV
Preview the extracted x-y rows and download a spreadsheet-safe CSV file.

Extract data from graph images

Use this plot digitizer when the data behind a chart is not available. It works with screenshots and exported figures, supports linear and logarithmic axes, and can trace multiple colored series from the same image. Keep stair-step mode on for step plots. Turn it off for ordinary line or scatter plots.

How to digitize a plot

Load your image

Drag and drop, or browse for a PNG, JPG, or screenshot. The image stays in your browser.

Calibrate the axes

Enter the tick values shown on the figure.

Trace the data

Pick a series color and trace it automatically, or add points by hand when the image is messy.

Download CSV

Preview the extracted x-y rows and download a spreadsheet-safe CSV file.

Extract data from graph images