Export a Google Drive spreadsheet to PDF in Google Drive in the same folder.

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Code.gs

// Simple function to add a menu option to the spreadsheet "Export", for saving a PDF of the spreadsheet directly to Google Drive.
// The exported file will be named: SheetName and saved in the same folder as the spreadsheet.
// To change the filename, just set pdfName inside generatePdf() to something else.

// Running this, sends the currently open sheet, as a PDF attachment
function onOpen() {
  var submenu = [{name:"Save PDF", functionName:"generatePdf"}];
  SpreadsheetApp.getActiveSpreadsheet().addMenu('Export', submenu);  
}

function generatePdf() {
  // Get active spreadsheet.
  var sourceSpreadsheet = SpreadsheetApp.getActive();
  
  // Get active sheet.
  var sheets = sourceSpreadsheet.getSheets();
  var sheetName = sourceSpreadsheet.getActiveSheet().getName();
  var sourceSheet = sourceSpreadsheet.getSheetByName(sheetName);
  
  // Set the output filename as SheetName.
  var pdfName = sheetName;

  // Get folder containing spreadsheet to save pdf in.
  var parents = DriveApp.getFileById(sourceSpreadsheet.getId()).getParents();
  if (parents.hasNext()) {
    var folder = parents.next();
  }
  else {
    folder = DriveApp.getRootFolder();
  }
  
  // Copy whole spreadsheet.
  var destSpreadsheet = SpreadsheetApp.open(DriveApp.getFileById(sourceSpreadsheet.getId()).makeCopy("tmp_convert_to_pdf", folder))

  // Delete redundant sheets.
  var sheets = destSpreadsheet.getSheets();
  for (i = 0; i < sheets.length; i++) {
    if (sheets[i].getSheetName() != sheetName){
      destSpreadsheet.deleteSheet(sheets[i]);
    }
  }
  
  var destSheet = destSpreadsheet.getSheets()[0];

  // Repace cell values with text (to avoid broken references).
  var sourceRange = sourceSheet.getRange(1,1,sourceSheet.getMaxRows(),sourceSheet.getMaxColumns());
  var sourcevalues = sourceRange.getValues();
  var destRange = destSheet.getRange(1, 1, destSheet.getMaxRows(), destSheet.getMaxColumns());
  destRange.setValues(sourcevalues);

  // Save to pdf.
  var theBlob = destSpreadsheet.getBlob().getAs('application/pdf').setName(pdfName);
  var newFile = folder.createFile(theBlob);

  // Delete the temporary sheet.
  DriveApp.getFileById(destSpreadsheet.getId()).setTrashed(true);
}

install.txt

To use this script in Google Drive:

1. In your spreadsheet, click Tools->Script Editor.
2. Paste the contents of Code.gs into the editor.
3. Save.
4. Select "Allow" when Google asks about permissions.
5. Reload your spreadsheet.

You should now see a new file menu option, "Export".