How to convert a graph image to Excel data

You want the graph's numbers in a spreadsheet, ready to plot again or to analyse. This gives you the workbook directly.

What the Excel file holds

One sheet per chart, with a column for each axis and a row for each point.
Dates as real Excel dates, so they sort and plot.
Error-bar ends in their own columns.
An audit sheet: source, page, method, and anything changed by hand.

Steps

Drop in the graph or the PDF.
Check the values on the chart and edit the table if needed.
Choose Download Excel, CSV, or Copy table.

Good to know

When a PDF holds the chart as a drawing (most figures in papers do), the values are read from the drawing itself. Nothing is estimated from pixels, so a point is as precise as the file is.

A picture (a screenshot, a scan, a PNG or JPEG) is read by an AI model. Every value is then drawn back on the picture as a ring, so a wrong one is easy to see and to correct in the table.

Questions

Can I get CSV instead?

Yes. CSV gives the current chart's table. Excel adds the other charts and the audit sheet.