VAST Tag Validator
Use this tool to validate your VAST tags by entering a VAST tag URL or VAST XML content. The validator will analyze the structure of your VAST XML, check for common errors, and provide insights to help you debug any issues.
Other Ad Validators
VAST Summary Validation
Get comprehensive validation reports for your VAST ad tags with detailed analysis of all components.
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How VAST summary works
When you submit your VAST tag for validation, our system performs a deep analysis of every aspect of your VAST XML. We check for compliance with IAB standards, validate media files, verify tracking URLs, and analyze the structure of your tag. The results are presented in an easy-to-understand summary that highlights any issues found and provides clear recommendations for improvement.
The VAST tag summary analysis break down
- VAST VersionChecks if the VAST version is supported and valid.
- Media FilesEnsures media files are present and properly formatted.
- DurationValidates that the ad duration is specified and reasonable.
- Tracking EventsChecks for required tracking events and their correctness.
- Click TrackingVerifies click tracking URLs are present.
- Impression TrackingEnsures impression tracking is implemented.
- Companion AdsChecks for valid companion ads if present.
- Ad SystemValidates the AdSystem element.
- API FrameworkChecks for correct API framework usage.
- Ad SequenceValidates ad pod sequence numbers (for sequential ads).
- Sequence TimingChecks total duration and timing of ad pods.
- VMAP VersionChecks VMAP version (for VMAP tags).
- Ad BreaksValidates ad breaks in VMAP.
- Ad Break TimingChecks timing of ad breaks in VMAP.
- VAST ReferencesEnsures VMAP ad breaks reference valid VAST tags.
Results example
You'll need to register or login to view Ad tag validation results. After you validate your VAST tag, you'll see a detailed breakdown of each section of your VAST XML. The results show which parts passed, which failed, and how to fix any issues found.
Key Features
- Instant validation of VAST 2.0, 3.0, 4.0, 4.1, and 4.2 tags
- Comprehensive error detection and reporting
- Best practice recommendations and warnings
- Impression and tracking URL verification
- Companion ad detection and preview
- API framework detection (VPAID, SIMID, OMID)
- Duration and bitrate analysis
- XML structure and schema compliance checking
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