WebViewer 7.1 adds support for an experimental text edit feature in the UI which allows you to edit text directly on PDF files. After selecting text a button appears in the text selection menu which allows you to change the text.

Enable text editing feature

This feature requires the WebViewer Full API , which can be enabled by passing the option fullAPI: true into the WebViewer constructor and you also need to enable the text edit button in the UI.

WebViewer({
  fullAPI: true,
  // other options
}, document.getElementById('viewer'))
.then(() => {
  // Enable text edit button
  instance.UI.enableElements(['editTextButton']);
});

You will see the text edit button after selecting text