Enter Your VAST Tag URL to validate ad sequence
Validating the VAST tag for the profile: Ad Sequence
Use this page to preview and debug the VAST tag in our online VAST tester. View the VAST XML, video ad player preview, tracking events, and more.
How Our Online VAST Tester Works
- Paste your VAST tag URL into the input field.
- Click the "Validate" button to start the validation process.
- Review the validation results and fix any issues using the provided feedback.
What is a VAST Tester?
A VAST tester is a tool that loads your VAST XML ad tag and simulates how a video player would interpret it. Instead of guessing whether your tags will deliver correctly, you can test them online and spot issues before launch.
VAST Video player - Ad Preview and Inspector
VAST Tag Preview & Validator
Once you paste your VAST tag URL and click Validate, your VAST tag preview will appear here. Our VAST online validator instantly loads your ad response, showing a live video ad playback, media file details, and tracking events.
Video ad previews are powered by the Google IMA SDK.
Our VAST tester helps you:
- Debug and troubleshoot VAST errors
- Preview video ads in real-time
- Inspect media assets and tracking pixels
- Verify compliance with VAST standards
- How to fix common VAST errors detected during validation
By running your tags through the preview, you can be confident your video ads will deliver correctly before launching campaigns.
VAST Validation Results
What We Test For
When you run a test in our VAST Tag Tester, we check your VAST or VMAP tag for the following common issues and best practices
Ad Sequence
Validates ad pod sequence numbers (for sequential ads).
Ensures ad sequence numbers are unique and properly ordered.
Why we test ad sequence
Ad sequence testing guarantees that ads play in the intended order within a pod, ensuring storytelling, pacing, and compliance with campaign delivery requirements.