Convert PDF to PPTX in JavaScript

Converting operation depends on the number of pages in the document and can be very time-consuming. Therefore, we highly recommend using Web Workers.

This code demonstrates a way to offload resource-intensive PDF file converting tasks to a web worker to prevent blocking the main UI thread. It also offers a user-friendly way to download the converted file.

Try to convert PDF to PowerPoint online

Aspose.PDF for JavaScript presents you online free application “PDF to PPTX”, where you may try to investigate the functionality and quality it works.

Convert PDF to PPTX

  /*Create Web Worker*/
  const AsposePDFWebWorker = new Worker("AsposePDFforJS.js");
  AsposePDFWebWorker.onerror = evt => console.log(`Error from Web Worker: ${evt.message}`);
  AsposePDFWebWorker.onmessage = evt => document.getElementById('output').textContent = 
    (evt.data == 'ready') ? 'loaded!' :
      (evt.data.json.errorCode == 0) ? `Result:\n${DownloadFile(evt.data.json.fileNameResult, "application/vnd.openxmlformats-officedocument.presentationml.presentation", evt.data.params[0])}` : `Error: ${evt.data.json.errorText}`;

  /*Event handler*/
  const ffileToPptX = e => {
    const file_reader = new FileReader();
    file_reader.onload = event => {
      /*Convert a PDF-file to PptX and save the "ResultPDFtoPptX.pptx" - Ask Web Worker*/
      AsposePDFWebWorker.postMessage({ "operation": 'AsposePdfToPptX', "params": [event.target.result, e.target.files[0].name, "ResultPDFtoPptX.pptx"] }, [event.target.result]);
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };

  /*Make a link to download the result file*/
  const DownloadFile = (filename, mime, content) => {
      mime = mime || "application/octet-stream";
      var link = document.createElement("a"); 
      link.href = URL.createObjectURL(new Blob([content], {type: mime}));
      link.download = filename;
      link.innerHTML = "Click here to download the file " + filename;
      document.body.appendChild(link); 
      document.body.appendChild(document.createElement("br"));
      return filename;
    }

The following JavaScript code snippet shows simple example of coverting PDF to PPTX files:

1. Select a PDF file for converting.
2. Create a ‘FileReader’.
3. The AsposePdfToPptX function is executed.
4. The name of the resulting file is set, in this example “ResultPDFtoPptX.pptx”.
5. Next, if the ‘json.errorCode’ is 0, then your result File is given the name you specified earlier. If the ‘json.errorCode’ parameter is not equal to 0 and, accordingly, there will be an error in your file, then information about such an error will be contained in the ‘json.errorText’ file.
6. As a result, the DownloadFile function generates a link and allows you to download the resulting file to the user’s operating system.

  var ffileToPptX = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      /*Convert a PDF-file to PptX and save the "ResultPDFtoPptX.pptx"*/
      const json = AsposePdfToPptX(event.target.result, e.target.files[0].name, "ResultPDFtoPptX.pptx");
      if (json.errorCode == 0) document.getElementById('output').textContent = json.fileNameResult;
      else document.getElementById('output').textContent = json.errorText;
      /*Make a link to download the result file*/
      DownloadFile(json.fileNameResult, "application/vnd.openxmlformats-officedocument.presentationml.presentation");
    }
    file_reader.readAsArrayBuffer(e.target.files[0]);
  }