WebPlotDigitizer - Copyright 2010-2024 Ankit Rohatgi (2025)

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Load Image File(s)

Magnified View Settings

Run Script

Load a Javascript file to further extend the capabilities of WebPlotDigitizer.

For examples, visit the WebPlotDigitizer repository.

Webcam Capture

Choose Plot Type

X and Y Axes Calibration

Enter X-values of the two points clicked on X-axis and Y-values of the two points clicked on Y-axes

Bar Chart Calibration

Enter the values at the two points selected on the continuous axes along the bars

Rotated axes (not exactly vertical or horizontal)

Map Axes Calibration

Map Scale Size:

Origin location:

Bottom left

Top Left

Align Polar Axes

Degrees Radians

Clockwise

Select Range of Variables

Axes Orientation

Normal	Reverse

Range of Variables

Align Circular Chart Recorder Axes

Acquired Data

Align X-Y Axes

Click four known points on the axes in the order shown in red. Two on the X axis (X1, X2) and two on the Y axis (Y1, Y2).

Align Bar Chart Axes

Click on two known points (P1, P2) on the continuous axes along the bars

Align Map To Scale Bar

Click on the two ends of the scale bar on the map.

Align Polar Axes

Click on the center, followed by two known points.

Align Ternary Axes

Click on the three corners in the order shown above.

Align Circular Chart Recorder Axes

Click on five (5) points on the chart axes as shown:

• First three (3) points at different maginitudes but the same known time (T0).
• Next two (2) points on any times (T1, T2) but at the same magnitude as R2.

WebPlotDigitizer - Web Based Plot Digitizer

Version 4.8

This program is distributed under the GNU Affero General Public License Version 3.

Copyright 2010-2024 Ankit Rohatgi <plots@automeris.io>

List of Contributors

https://automeris.io/WebPlotDigitizer

Specify Color

R: G: B:

Dominant Colors:

Transformation Equations

The following relationships are being used to convert image pixels to data:

Export JSON or Project File

Export a JSON file containing the axes calibrations, digitized data and measurements. This JSON file can be loaded to resume work at a later time. You can also download a combined 'project file' which includes this JSON and also the image in a single TAR file.

Project name: .json/.tar

Import JSON/Project

Load a previously exported JSON or project file (.tar)

(Note: This will clear any unsaved data in the current plot.)

JSON/Project File:

Keyboard Shortcuts

Click to select a data point. The following keys can then be used to adjust the position:

Edit Label

Label:

Override Point Values

Perspective Transformation

Click on four corners of the region to be transformed as shown.

Edit Existing Calibration?

Do you wish to tweak existing axes calibration or select a new axes type?

Export All Datasets

Export data from all datasets

Add Dataset

Name:

Count:

Rename Dataset

Rename Axes

Image Info

Page Labels

Relabel the current page number with an alphanumeric string. Optionally, relabel all page numbers in the image based on the current page (only supports integer values).

New page label:

Point Groups

Point groups are groups of related data points such as standard error or confidence intervals. To define a point group, enter a name in the text input below. Create additional point groups as necessary. E.g. Assume we have 3 point groups defined: Median, Standard error +1, and Standard error -1. Points would be entered in the order shown in the image to the right. For each set of points, the median value would first be recorded, then the standard error +1, and finally the standard error -1. The process would repeat for the next set of points.