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Synchronous vs Asynchronous Ad Code: Which one to Choose & Why?

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Let’s start with their basic meanings. The word Synchronous means happening at the same time. While Asynchronous simply means not simultaneous or concurrent in time.

Synchronous Ad Code

We understand this with a very simple example. Suppose there are three Ads (Ad1, Ad2 and Ad3) on a site.

  • If the Ad Code is Synchronous, Ad2 is loaded only after completion on Ad1.
  • Ad3 is loaded after Ad2 is loaded.
  • OR; first, the Ad1 is loaded, then the Ad2 and finally the Ad3.

Asynchronous Ad Code

While in case of Asynchronous Ad Codes, before the end of Ad1, Ad2 will be started loading in browser, similarly with Ad3. Here, all the Ad Codes load at the same time.

Synchronous Ad Code Vs. Asynchronous Ad Code (Practical Example)

Suppose you have placed a 728×90 leaderboard ad at the top of your website. As you know, it would be one of the first things to load. Now, if you are using Synchronous Ad, it will load as the page loads, from top to bottom.

On the other hand, if you were using an Asynchronous Ad, it would actually load independently of your page.

So, an asynchronous ad tag is a third party tag which is loaded by the browser independent to the rest of the content page, resulting in faster page load time in case the tag call is blocked or dropped.

Synchronous ad tags do not rely on iFrames and live right on your webpage, loading with the rest of the content and styling on your webpage.

Synchronous Ad Code Vs. Asynchronous Ad Code: Which one to Choose & Why?

Now, you must be wondering if you have Asynchronous vs Synchronous Ads on your site? or which one you should choose? Well, unless you specifically requested synchronous Ads, all AdSense Ads are issued Asynchronous codes by default. The ad code you generate in your AdSense account is fully asynchronous. It offers improved web latency and better user experience for your site’s visitors.

Besides, we recommend Asynchronous Ads because they allow the publisher’s page to load faster, improve the loading speed of your site, reduce the server load and give your readers a better experience.

Can I change Asynchronous Ads to Synchronous Ads?

As per Google AdSense Help, the option to change your code type to Synchronous in your AdSense account won’t be available anymore. If you do need synchronous ad code, you can follow these instructions to manually generate synchronous ad code for your ad units.

Remember, you can only generate synchronous ad code for fixed-sized ad units. Also, never mix asynchronous and synchronous ad code on the same web page.

[VIDEO TUTORIAL] Synchronous vs Asynchronous Ad Code: Which one to Choose & Why? [Urdu/Hindi]


  • [1:21] Synchronous AdSense Ads Vs. Asynchronous Ads (Practical Example)
  • [2:23] What is Synchronous Ad Code?
  • [3:14] What is Asynchronous Ad Code?
  • [3:42] Which one to choose – Synchronous or Asynchronous Adsense Ads?
  • [5:39] How to check which AdSense codes are Synchronous or Asynchronous?
  • [7:08] How to convert Synchronous AdSense ads to Asynchronous?

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Naeem Javid

Naeem Javid Muhammad Hassani is working as Deputy Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu ( Forestrypedia (, All Pak Notifications (, Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.

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