Get Started

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Learn more

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Common use cases

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Open a document

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Save a document

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Viewer

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UI Customization

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Annotations

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Collaboration

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Forms

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Signature

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Measurement

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PDF.js Express REST API

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Set up measurement tools

When creating a new instance of PDF.js Express, the enableMeasurement property needs to be set to true to display the measurement annotation tools in the UI.

WebViewer({
  ... // other options
  enableMeasurement: true
}, viewerElement);

Besides passing in a constructor option, measurement can be toggled using the PDF.js Express API with the enableMeasurement and disableMeasurement functions.

WebViewer({
  ... // other options
}, viewerElement)
  .then((instance) => {
    instance.enableMeasurement();
  });