It is important to remember why this exists. Google Apps Script allows anyone to write code that can access Google Drive, Gmail, and Calendar data. Without that banner, a malicious actor could easily build a fake "Google Login" page that looks identical to a real one. The banner serves as a "Proceed with Caution" sign for the end-user.
While the banner still technically exists inside the iframe, it stays contained within that frame. If you style your website correctly, the banner feels less like a "system warning" and more like a small footer or header element within a specific window. Method 2: Using a Custom Domain with a Proxy (Advanced) It is important to remember why this exists
Use the following HTML code on your own website: The banner serves as a "Proceed with Caution"
Using a service like or a simple Node.js/Express server, you can fetch the HTML content from your Google Apps Script, strip out the Google-injected header tags, and serve the cleaned HTML on your own custom domain. Pros: Complete removal of the banner; professional URL. Method 2: Using a Custom Domain with a
If you want to completely strip the banner, you cannot host the app on Google’s servers directly. Instead, you can use a "proxy" or a middle-man server.
The short answer is . There is no "off switch" in the Google Apps Script settings to hide this banner.
However, depending on your technical skills and how you intend to share the app, there are three primary workarounds. Method 1: Embedding the Web App in an Iframe