# Video Letterboxing Detector | Online Test Tool | API Available

[![AdValify Ad Validation Toolkit](/images/logo20.png)](/) 

*Ad Validation Software*

 

HTML5Ad TagVASTVideoCTVBannerAPISupport

    

☰

  

# Video Letterboxing Detector

 

## Upload Your Video Ad to check if the video has black bars.

 

Check 26+ ad quality tests for ad performance — validate against IAB video ad guidelines

   
 

Go ahead, just

drop your ad !

 

Drop up to 50 video ads 

**MP4**, **WebM**, **MOV**, **AVI**, **MPG**, **3GP**, **MXF** — Max size 100 MB

  

![AdValify Customer Review Dylan Coetzee](/images/testimonials/dylan_coetzee.png)![AdValify Customer Review Giovanni Sollazzo](/images/testimonials/giovanni_sollazzo.png)![AdValify Customer Review Stefan von Gartzen](/images/testimonials/stefan-von-gartzen.jpg)![](/images/star.svg)![](/images/star.svg)![](/images/star.svg)![](/images/star.svg)![](/images/star.svg)

 

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![](/images/favicon20.png) AdValify.io © 2023 - 2026

 

AdValify lets you test and check your MP4 video ads with this ad validator. View your MP4 video ads before they go live. Uses IAB ad guidelines for ad validation tests. API available.

 

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 ![Underline](/images/underline.png)

Products

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 [Full API Docs](/api-docs)  
 [Get an API Key](/contact)  
 [GitHub PHP Class](https://github.com/AdValify/ad-validator-php)  
 [See All Tests](/ad-validation-tests)

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