Some test text!


Open a document

There are a few ways to open a document such as from a URL, a blob, the filesystem, or base64 data. Additionally, there are loading options to help WebViewer determine the type of the file being loaded.

Opening a document in WebViewer from file system

If you have the File object, from a file picker for example, you can pass the object directly to loadDocument function.

<label for="file_upload">Choose A file</label>
<input type="file" id="file_upload" name="file_upload" accept=".pdf">

<div id='viewer' style='width: 1024px; height: 600px;'></div>

  const input = document.getElementById('file_upload');

    .then(instance => {
      input.addEventListener('change', () => {

        // Get the file from the input
        const file = input.files[0];
        instance.loadDocument(file, { filename: });

      const { docViewer } = instance;
      docViewer.on('documentLoaded', () => {
        // perform document operations

See more WebViewer events such as documentLoaded to understand when to execute API operations.

If you run into any issues loading a document, please visit our FAQ.

Get the answers you need: Support


Free Trial

Get unlimited trial usage of PDFTron SDK to bring accurate, reliable, and fast document processing capabilities to any application or workflow.

Select a platform to get started with your free trial.

Unlimited usage. No email address required.

Join our upcoming webinar to learn about how to collaborate on videos frame by frame directly in your browser

Save your seat