An especially useful time to run a split test is when you make an edit to an existing active ad set. Doing so allows you to test the effectiveness of your edits. Here's how it works:

After you edit your ad set, we prompt you to create a test. If you do this, we then create a new ad set with the edits that you just made and return the ad set you edited back to how it was. We'll split their audiences and budgets for you, and they'll both run until they're scheduled to stop.

To create a split test while editing an ad set:

1. Go to Ads Manager.
2. Hover over the ad set you want to edit.
3. Click Edit.
4. Edit your ad set.
5. Find the Want to test these changes? box that appears.
6. Click Create test.
7. Click Confirm.

When you won't be prompted to create a test when you're editing an ad set

You won't be prompted to create a test if the ad set you're editing is:

• Inactive
• Part of a campaign using campaign budget optimisation

• Name
• Budget
• Schedule

1. In Ads Manager, choose the marketing objective for your campaign.
2. Select Create split test.
3. Click Continue.
4. In the Variable section, choose the variable you want to test. You can test one variable at a time.
5. Make additional choices based on the variable that you're going to test:
• If you choose audience as your variable: Under the Audience section, select a saved audience or create a new one for each ad set.
• If you choose delivery optimisation as your variable: Under the Delivery optimisation section, select your delivery and bid strategies for each ad set.
• If you choose placements as your variable: Under the Placements section, select whether you would like automatic placements or choose your placements to customise where ads are shown.
• If you choose creative as your variable: Finish setting up your ad set and click Continue. Set up different versions of your ad at the ad level.
• If you choose product set as your variable: Choose the product sets that you want to test (up to five) and then make your selection for audience.
6. In the Budget & schedule section, choose a budget.
7. In the Split sub-section, choose whether you want your budget to be split evenly (even split) or unevenly (weighted split) between the ad sets that you're testing. If you choose a weighted split, you also have to choose what percentage of your budget you want to assign to each ad set.
8. Choose a duration for your test. It must be between 1 and 30 days. Your test can start today or at a future date that you set.
9. Click Continue when you've finished setting up your ad sets.
10. Set up your ads and place your order.

Your test will start on the date you specified. When it's over, you'll get an email and notification with the results.

To create an audience, placements or delivery optimisation split test, you'll need to complete steps at the campaign, ad set and ad level.

Campaign level

1. Enter the name of your campaign and click the Split test toggle.
2. Choose the variable you want to test from the drop-down menu.
3. Choose the number of ad sets (up to five) that you want to create in your campaign.
4. Select Save to Draft.

Ad set level

1. Select one ad set (not multiple).
2. Click Edit to open the editing pane.
3. Depending on the variable that you're testing, create your audience or make delivery optimisation or placement selections. For example, if you're testing different audiences, navigate to the Audience (Variable) section and select a saved audience or create a new one.
4. Repeat this process for your remaining ad sets. Make sure that you set a different version of your variable for each ad set. You won't be able to proceed if you don't. To continue the example, make sure that each of your ad sets has a different audience.
5. Click Close to save your ad sets.
6. Select all of your split test campaign's ad sets and click Edit to open the editing pane again.
7. Make your selections for all the non-variable sections. To continue the example again, your audiences should already be set, but you'll still need to set a budget, schedule, placements and delivery optimisation for your ad sets.
8. Click Close to save your ad sets.

Ad level

1. Select all your ads for the split test campaign.
2. Click Edit to open the editing pane.
3. Set your ad creative.
4. Click Publish to start your campaign immediately, or Close to save your ads.

To create a creative split test, you'll need to complete steps at the campaign, ad set and ad level.

Campaign level

1. Enter the name of your split test campaign and click the Split test toggle.
2. Choose Creative from the drop-down menu.
3. Choose the number of ads sets and ads you want to create.
4. Create your ad sets and ads.
5. Click Save to draft.

Ad set level

1. Select all your ad sets.
2. Click Edit to open the editing pane.
3. Set up your ad sets.
4. Click Close to save your ad sets.

Ad level

1. Select one ad at a time and select Edit to open the editing pane.
2. In the editing pane that appears, you'll add your ad creatives including headlines, images, videos, website links and CTA (call to action). Once you've finished, click Close to save or Publish.
3. Select another ad and select Edit. You'll then add your ad creatives for the other ad.
4. Click Close to save or Publish to start your test campaign immediately.

When you create a split test where your variable is product sets, you define the variable differences at the ad set level. For each ad set, the retargeting audience is based on the product set.

Create your campaign:

1. Enter the name of your split test campaign and toggle the Split test button.
2. Select Product set from the drop-down menu.
3. Select the number of versions that you want to create and then name your ad sets and ads.
4. Select Save to Draft.

1. Select all of your ad sets at once and select Edit to open the editing pane.
2. Use the drop-down menu to choose the product set that you want to use.
3. Choose the product sets that you want to test.
4. Define your audience, budget, schedule, placements and delivery optimisations.

1. Select all of your ads at once and select Edit to open the editing pane.
2. Add your creatives in the editing pane that appears, including formats, headlines, images, videos, website links and call-to-action buttons.
3. Close the editing pane to save, or Publish to publish immediately. Your split test campaign is now ready.

1. Select an active ad set.
2. Click Duplicate.
3. Click the Create a test to compare a new ad set with your original ad set toggle.
4. A new ad set will be created and the editing pane will open.
   If you're testing audiences, delivery optimisations, placements or product sets, make the appropriate change to the new ad set. Everything else can stay the same. Publish when you're ready.
   If you're testing creative, leave the duplicate ad set as is, and create a new ad. Publish when you're ready.

When creating a test from duplication, there are a few important things to remember:

• You can only create a test from an active ad set.
• You can only create one new ad set at a time.
• The budget for your new ad set will default to half of what was remaining in the existing ad set's budget. To edit the budget, click Change total budget and set the amount you want. You can change how the budget is split for the daily budget, but not for the lifetime budget.

• Your test will continue to run until you end it or the budget runs out.
• We provide guidance on how your test is going every 12 hours. If there's a winning ad set, we tell you the winner. You may also see a tie, where the ad sets are performing similarly, or there may not be enough data yet to determine a winner.
• You can view your results in the results panel. You can see which ad set is performing better and select Use winning ad set to use the winner in the future.