Upload Files to HTML Form with Google Apps Script

The Google Script will automatically download a file from the Internet and upload it to another HTML form with an HTTP POST request. If the file already exists in your Google Drive, you can use the DriveApp.getFileById() method to retrieve the file and send it to the web form. Also see: Receive Files in Google Drive

function downloadFile() {
  // Download a file now (GET), so we can upload it in the HTTP POST below.
  var response = UrlFetchApp.fetch('https://www.google.com/humans.txt');
  var fileBlob = response.getBlob();

  var payload = {
    fieldOne: 'value for field one',
    fieldTwo: 'value for field two',
    fileAttachment: fileBlob,

  // Because payload is a JavaScript object, it will be interpreted as
  // an HTML form. (We do not need to specify contentType; it will
  // automatically default to either 'application/x-www-form-urlencoded'
  // or 'multipart/form-data')

  var options = {
    method: 'post',
    payload: payload,

  UrlFetchApp.fetch('http://example.com/upload_form.cgi', options);
Amit Agarwal

Amit Agarwal

Google Developer Expert, Google Cloud Champion

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India.

Amit has developed several popular Google add-ons including Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory


Awards & Titles

Digital Inspiration has won several awards since it's launch in 2004.

Google Developer Expert

Google Developer Expert

Google awarded us the Google Developer Expert award recogizing our work in Google Workspace.

ProductHunt Golden Kitty

ProductHunt Golden Kitty

Our Gmail tool won the Lifehack of the Year award at ProductHunt Golden Kitty Awards in 2017.

Microsoft MVP Alumni

Microsoft MVP Alumni

Microsoft awarded us the Most Valuable Professional (MVP) title for 5 years in a row.

Google Cloud Champion

Google Cloud Champion

Google awarded us the Champion Innovator title recognizing our technical skill and expertise.

Email Newsletter

Sign up for our email newsletter to stay up to date.

We will never send any spam emails. Promise.