When to add Fluid sizes for Ad Exchange and display ad units

When to add Fluid sizes for Ad Exchange and display ad units

Fluid is a native ad size recommended by Google. It has no definite size and automatically adjusts according to the inventory dimensions. It allows flexibility in customizing an ad and works seamlessly with responsive ad tags. It has been available in Ad Exchange for quite some time and has been getting high coverage and eCPMs contributing to the increase of a site’s overall performance.

When to Add Fluid size for Ad Exchange and Display Ad Units

When you consider adding native formats to increase inventory demand, adding the fluid ad size can definitely help. You can choose to use your existing ad units for targeting or create a new one. If you have deployed and been running the ad units on the page, you will need to update the code and ad fluid size as well. Here’s a step-by-step guide to help you set up Programmatic Natives in Google Ad Manager:

1) Go to Inventory > Ad Units > Ad unit setting  > Sizes  > Add fluid size

fluid 1

2) Create native Styles

a) Go to Delivery  >  Native  >  Create Native Ad

create native ad

b) Select how you would want to create your native ad.

native ad design

3) Add Native style name, select path, and add choose fluid for the size. Click Continue.

define ad settings

4) Select your preferred settings or just click Continue if none.

select settings

5) Add targeting and save.

choose ad targeting

6) In your Ad Exchange Line Items, you will need to add Native Programmatic in the inventory sizes.

native programmatic

7) Auto-generate creatives for each Ad Exchange Line item.

8) Follow the steps below on how to generate a report and check the performance:

a) Open your Google Ad Manager account

b) Go to Reports > All Queries > New Queries

c) Report type: Historical

e) Set the date range

f) Add Dimensions and metrics needed

g) Run Report.


You can choose to compare performance by size, ad unit, and native styles depending on the report that you need. Adding more native styles with fluid ad sizes creates new opportunities in your inventory and can help you increase your ad revenue. Need help setting up fluid ad sizes, optimizing your ad inventory, setting up header bidding, and more? MonetizeMore is Google Certified Publisher Partner, ready to help take your ad revenue to the next level! Sign up to MonetizeMore today.

Kean Graham

CEO and Founder at MonetizeMore

Kean has been a pioneer in the AdTech world since 2010 who believes in the supremacy of direct publisher deals, programmatic advertising, and building ad technology as keys to scaling ad revenue. Here, he provides publisher resources and guides covering areas like website monetization, AdSense optimization, Google Ad Manager, Ad Exchanges, and much more.

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  1. Dinushan

    Hi Team,

    I tried to add the custom Google Ad Manager size to the Ad Manager Tag Generator & Tester (https://dfpgpt.appspot.com/) tool, but I am not able to enter the value. My custom size value is 630*90. Can I make sure that Google Ad Manager Tag Generator & Tester toll will detect only the predefined sizes or can you guide me on how to add the custom sizes.

    Thank you

    Best Regards,

    • MonetizeMore

      Enter the custom sizes within the Ad Manager UI, then generate the tags with the tool. This should enable you to add custom sizes.


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