Welcome to the YouTube VAST Validator Tool! You can use this tool to verify that your VAST
ad tags meet specifications for third party served video ads on YouTube. Just input the
VAST tag, and we'll show you a summary of the results.
This section shows the overall verdict for the submitted VAST tag.
If the verdict is FAIL you need to fix the listed errors and validate again until
you get overall verdict PASS.
This sections lists the overall errors in the submitted VAST tag.
Unique Media Files:info_outline
This section lists all media files used in all Ads and creatives in the submitted
This section shows the result of server-side cachebusting check for the VAST tag.
This section shows the clickthrough URLs across possible tag variations.
This is only a FYI at this point and can be ignored.