User: Remove This Application Was Created By A Google Apps Script

If you are developing an internal business tool rather than a public-facing website, you can remove the banner completely by limiting your deployment permissions.

The bar forces a fixed layout minimum width. On smaller mobile viewports, it breaks the viewport meta tag, zooming the actual app content out and creating a frustrating user experience.

How to handle when fetching data from a custom frontend API. If you are developing an internal business tool

The absolute best way to build a professional app without any Google branding is to treat Google Apps Script strictly as a backend API (headless architecture) and host your user interface somewhere else entirely.

If your app truly needs full, unrestricted access to user emails and Google Drive and serves the general public, removing the warning might be impossible without a security assessment. In that case, consider building a native web app using Cloud Run or Firebase instead of Apps Script. How to handle when fetching data from a custom frontend API

You can remove these applications through your Google Account permissions settings.

This is not a long-term fix. Google may flag apps that use test mode for production purposes, and you cannot exceed 100 users. In that case, consider building a native web

For public-facing applications that cannot be restricted to a Workspace domain, the official way to remove security warnings is through Google Cloud verification.