For a quick solution, you can install a browser extension that removes the banner. One such extension is “Google Apps Script WebApp Warning Remover” for Firefox. It simply hides the top warning on Apps Script web app pages.
The banner is particularly problematic on mobile devices. Since September 2023, the banner forces the web app to zoom out to accommodate the extra header, making the content below very difficult to operate. The IFRAME hosting method is your best defense against this issue, as it completely bypasses Google's banner display on the wrapper page. For a quick solution, you can install a
This application was created by [Your Company Name] The banner is particularly problematic on mobile devices
Method 3: Reverse Proxy via a Node.js or Cloudflare Worker Server This application was created by [Your Company Name]
The message “This application was created by a Google Apps Script user” is a security feature, not a bug. It protects users from malicious scripts. However, for legitimate developers, it creates unnecessary friction.
Use or adapt any of the lines above to fit your exact experience.