Plot Extractor — Extract Data from Graphs, Plots & Charts

Plot Extractor is an all-in-one online plot digitizer that extracts numerical data from graph, plot, and chart images inside PDF, SVG, PNG, JPG, JPEG, WEBP, GIF, and BMP files. Auto-detects the plot region, axis anchors, and curve color, then autotraces points so you only correct what looks wrong. Export to CSV or JSON. Free, no signup, runs locally in your browser at plotextractor.com.

A free WebPlotDigitizer and PlotDigitizer alternative

If you've used WebPlotDigitizer, PlotDigitizer, Engauge Digitizer, or GetData Graph Digitizer to extract data from graphs, you'll feel at home. Plot Extractor adds automation first: it makes a first pass at plot detection, calibration anchor placement, OCR of axis tick labels, and curve color selection — you only fix what's wrong.

Features

• Digitize graphs and plots from PDF datasheets
• Extract data from PNG, JPG, JPEG, WEBP, GIF, BMP, and SVG charts
• Automatic plot region and axis anchor detection
• Curve autotrace with assisted color extraction
• OCR and embedded-PDF text for axis tick values
• Linear and logarithmic (log10) axis calibration
• CSV, data JSON, and project JSON export
• 100% local: files never leave your browser

Frequently asked questions

How do I extract data from a graph in a PDF?

Upload the PDF, pick the figure, confirm the auto-detected plot box and axis anchors, enter the real tick values, accept the suggested curve, then export CSV.

How do I digitize a plot image (PNG or JPG)?

Drop the image in, let the app detect axes and the dominant curve color, calibrate the anchors with the real values, and export.

Does it work offline?

Yes. Once the page is loaded, extraction, OCR, and PDF parsing run entirely in your browser.

Learn more

• The automation-first plot digitizer — how Plot Extractor traces the curves for you, and the tools for correcting the rest.
• Extract plots from PDF datasheets — vector versus raster extraction, and why every file stays in your browser.