> For the complete documentation index, see [llms.txt](https://docs.adalysis.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.adalysis.com/tools/ad-testing/multi-ad-group-testing/testing-by-image-size.md).

# Testing by image size

This type of test is best for image ads in Google Display campaigns. It allows you to see which creative or ad size performs better based on your preferred metrics. 

### **How are the tests set up?** <a href="#how-are-the-tests-set-up" id="how-are-the-tests-set-up"></a>

You can run the tests and see results instantly. Alternatively, you can set them to run daily.

<figure><img src="/files/fHMt78dDPIsYcQIhBcaW" alt="" width="563"><figcaption></figcaption></figure>

1. Go to **Ad testing** > **Multi ad group** > I**mage ads.**
2. Select your campaigns and the date range for this test. A common date range means Adalysis will calculate a date range during which all ads within the test were active.
3. (Optional) specify the ad labels you want to use or exclude when comparing your ad performance.&#x20;
4. Select the image sizes you want to compare.&#x20;
5. Click **Find current winners**. &#x20;
6. If you want Adalysis to run this test automatically, click **Save & run this test daily**.  The test definition will then appear in the **Automated test definitions** tab and the daily test results will appear in the **Automated test results** tab.

### **Understanding the test result data** <a href="#id-3-understanding-the-test-result-data" id="id-3-understanding-the-test-result-data"></a>

You'll see the test results in the grid. Once you open the test result details, you will see the aggregate performance of each label/size (over the date range used) and the confidence the algorithm has in each of the metrics. &#x20;

You'll also see performance boost projections based on pausing all losing ads.&#x20;

After viewing individual test results, you can pause the losing ads with a single click.&#x20;

Once you pause the ads, you can always find the test result under the **Archived test results** tab.&#x20;


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