WebPlotDigitizer

WebPlotDigitizer is a web based tool for extracting numerical data from images of charts and plots. Much useful data sits locked in pictures of data visualizations, and the tool lets a user recover the underlying values by calibrating the axes and marking points on the image. It is published by automeris.io and has been in use for close to fourteen years. The current version, v5, combines multimodal machine learning methods, traditional computer vision algorithms and manual tools in one browser interface. AI assist features and the vision algorithms semi automate the work so that fewer points must be placed by hand. It handles many chart types, including XY line and scatter plots, bar charts, histograms, polar diagrams, ternary diagrams and circular chart recorders. Several images can be loaded at once, and PDF documents are supported. The previous version, v4, is kept in an archive. The tool is aimed at researchers, students and analysts who need data from published figures for meta analysis, replication or comparison. The site publishes no pricing and presents the software as launchable directly from the home page.