---
title: How to Block All Websites and Allow Specific URLs for Users in Google Chrome with GAT Shield
description: "Block All Websites in [Google Chrome](https://www.google.com/chrome/) with [GAT Shield](https://gatlabs.com/knowledge/tech-tips/gat-shield-overview/) allows an admin to **block a user from any web access** and **allows** them to use **only specific sites** to be accessed. First, we can use a special category called \"ALL\"…"
url: "https://gatlabs.com/knowledge/tech-tips/block-all-websites-chrome/"
updated: "2025-06-25"
category: "Chrome Audit & Management"
tags:
  - GAT Shield
---

# How to Block All Websites and Allow Specific URLs for Users in Google Chrome with GAT Shield

Block All Websites in [Google Chrome](https://www.google.com/chrome/) with [GAT Shield](https://gatlabs.com/knowledge/tech-tips/gat-shield-overview/) allows an admin to **block a user from any web access** and **allows** them to use **only specific sites** to be accessed.

First, we can use a special category called "ALL" that allows us to **block all site URLs** for the users.

We can then create a custom list of sites that will be allowed.

The allow list takes precedence over the blocklist. 

Below are instructions for how to enable this special category and block all, and how to create a simple allow category to allow specific sites. 

## **Blocklist**

Navigate to **GAT Shield > Site Access Control > ** **Predefined Categories **

![GAT Shield Predefined Categories dashboard showing ALL category and how to create a rule based on that category. The "Create rule for this category" button is displayed.](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/2025-06-05-14_32_06-Window.png)

In the **Predefined Categories** section, search for the "**all**" category. This is a special category that will**block all URLs** for the users. Click on the **+ Create rule for this category** button (2).

### Create the "block All" rule 

After clicking **+ Create rule for this category** button, the Create rule wizard window will be displayed, where you can fill in the required information.

- **Rule name** (1) - enter the name of the rule
- **Category** (2) - will be "all" as pre-selected 
- **Action:**
  - select "**Rule action - Block**" (3)
  - Redirect URL (optional) (4) - to redirect the user, enter the redirect URL
- **Scope**(5)- select the scope type and fill in other scope related fields if applicable
  - **Scope type:**
    - **User** - enter the users to be blocked
    - **Group**
    - **OU**
      - Include sub. org. units
    - **All users**
- **Create** (6) - click Create button to create the rule 

![The Create Rule wizard window showing Rule name, Category, Rule Actions and Scope. The Create button is also displayed. ](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/All-1.png)

### **Result**:

Blocking all websites in Chrome will prevent users from accessing any URL.

![GAT Shield blocking rule in action, blocking the user from accessing any website. The "Wrong Way, Go Back" message is displayed. ](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/2024-11-01-10_36_55-GAT-Shield-site-blocked.png)

## Allowlist

Now to **Allowlist** and set up the **Only pages** the user**is allowed to open**, navigate toto the Rules (1) section and select**Allow**/Block Sites (2)

![GAT Shield Rules section and the Allow / Block Websites button is displayed.](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/2025-06-05-14_34_50-Window.png)

When selected, a new pop-up window will be displayed.

Select **Allow**(1), and enter the**Scope** (2) of users to be affected by the rule.

![Allow / Block Website wizard window showing Allow activation rule for a specific user in the Scope.](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/All-2.png)

Scroll down the Allow /Block wizard window to enter the website URLs  (1) that will be allowed to be opened.

You can use the option to **Paste from clipboard** (2) or **Add Website / IP** manually (3).

The Additional Options section (4) is optional. You can add a rule description there to better identify the rule or provide a reason for adding it.

When ready, select "**Allow**" to activate the rule (5).

![Allow / Block Websites wizard window showing the list of Websites, the options to add the Websites, such as Past from clipboard or Add Website/ IP manually, Additional Options field (optional) with Rule description field, and the Allow button. ](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/All-3.png)

### **Result of the block and allowlists**

As a result, **all pages will be blocked but the allowed ones.**

![GAT Shield Block All Websites rule in practice shows that all websites are blocked, but access to specific websites is allowed.](https://gatlabs.com/knowledge/wp-content/uploads/2021/11/Blocked-and-allowed-sites.gif)