Blog
Methods, comparisons, and worked examples for getting numbers out of charts.
- · 12 min read
Extract Data from a Scatter Plot (Including Dense Ones)
Click each dot for sparse scatter plots; use color-based auto-extraction for dense ones. The cutoff is roughly 50 points. Worked example on a 200-point three-cluster genomics scatter.
Read more → - · 10 min read
How to Extract Data from a Logarithmic Chart
Digitize log-scale charts without arithmetic mistakes. Calibrate at two visible powers of ten, let the tool handle the math, and avoid the three traps that turn a log axis into garbage data.
Read more → - · 18 min read
Chart Digitization Accuracy: A Real Benchmark
Measured accuracy of chart digitization across five published figures and five tools. Mean absolute error, RMSE, worst-case error, and the methodology to reproduce the results on your own charts.
Read more → - · 12 min read
How to Extract Data from a Graph Image
A practical four-step method for digitizing data points from chart images, plus fixes for log axes, multi-series plots, and low-resolution scans.
Read more → - · 10 min read
WebPlotDigitizer Alternatives: 7 Tools Compared
An honest comparison of seven chart digitizers — including DataFromChart, WebPlotDigitizer, PlotDigitizer, GetData, Engauge, Graph Grabber, and im2graph.
Read more → - · 8 min read
How to Extract Data from a Chart in a PDF
Render the PDF page as a PNG, upload to a digitizer, calibrate the axes, and export. A walkthrough with a real journal-style example and fixes for common problems.
Read more → - · 16 min read
Data Extraction for Meta-Analysis: A Practical Guide
When authors don't share raw data, digitize from the published figure. A guide for systematic reviewers covering PRISMA/Cochrane requirements, Kaplan-Meier reconstruction, forest plots, and dose-response curves.
Read more → - · 9 min read
Chart Screenshot to Excel: From PNG to XLSX with the Chart Embedded
Take a screenshot of a chart, drop it into a digitizer, and export an XLSX file that ships the original image alongside the extracted data. A walkthrough of the format, the workflow, and why this beats CSV for sharing.
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