Convert Excel Files to CSV in Google Drive with Apps Script

C
Published in: Google Apps Script - Google Sheets

The Google Apps Script uses the Advanced Drive API to covert Microsoft Excel files (XLS, XLSX) into CSV files and saves them into a specific Google Drive folder. The Excel sheets are deleted after the CSV files are saved in Drive.

Also see: Convert Google Sheets to PDF Files

The conversion engine may timeout if you have too many XLS/XLSX files in a Google Drive and in that case, you’d need to include the time check to ensure that the script doesn’t exceed the execution time limit.


function convertXLSFilesToCSV() {

    var oauthToken = ScriptApp.getOAuthToken(),
        sourceFolder = DriveApp.getFolderById(SOURCE_XLS_FOLDER),
        targetFolder = DriveApp.getFolderById(TARGET_CSV_FOLDER),
        mimes = [MimeType.MICROSOFT_EXCEL, MimeType.MICROSOFT_EXCEL_LEGACY];

    /* Written by Amit Agarwal */
    /* email: amit@labnol.org  */
    /* website: www.ctrlq.org */

    for (var m = 0; m < mimes.length; m++) {

        files = sourceFolder.getFilesByType(mimes[m]);

        while (files.hasNext()) {

            var sourceFile = files.next();

            // Re-upload the XLS file after convert in Google Sheet format
            var googleSheet = JSON.parse(UrlFetchApp.fetch(
                "https://www.googleapis.com/upload/drive/v2/files?uploadType=media&convert=true", {
                    method: "POST",
                    contentType: "application/vnd.ms-excel",
                    payload: sourceFile.getBlob().getBytes(),
                    headers: {
                        "Authorization": "Bearer " + oauthToken
                    }
                }
            ).getContentText());

            // The exportLinks object has a link to the converted CSV file
            var targetFile = UrlFetchApp.fetch(
                googleSheet.exportLinks["text/csv"], {
                    method: "GET",
                    headers: {
                        "Authorization": "Bearer " + oauthToken
                    }
                });

            // Save the CSV file in the destination folder
            targetFolder.createFile(targetFile.getBlob()).setName(sourceFile.getName() + ".csv");

            // Delete the processed file
            sourceFile.setTrashed(true);

        }
    }

}
📮  Subscribe to our Email Newsletter for Google tips and tutorials!
Published in: Google Apps Script - Google Sheets

Looking for something? Find here!

Meet the Author

Web Geek, Google Developer Expert
A
Amit Agarwal

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. He is the developer of Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory

Get in touch

Google Add-ons

Do more with your Gmail and GSuite account
G

We build bespoke solutions that use the capabilities and the features of Google Workspace for automating business processes and driving work productivity.

  1. Mail Merge with Attachments
    Send personalized email to your Google Contact with a Google Sheet and Gmail
  2. Save Emails and Attachments
    Download email messages and file attachments from Gmail to your Google Drive
  3. Google Forms Email Notifications
    Send email notifications to multiple people when a new Google Form is submitted
  4. Document Studio
    Create beautiful pixel perfect documents merging data from Google Sheets and Google Forms
  5. Creator Studio for Google Slides
    Turn your Google Slides presentations into animated GIFs and videos for uploading to YouTube