What is VAST Tag Tester?
A free online tool for checking VAST ad tags and XML responses. Paste a VAST URL or raw XML, then quickly see errors, warnings, tracking pixels, media files, and wrapper chains. It validates VAST 2.0 through 4.3 against IAB specs, resolves wrappers up to 5 hops, and helps ad ops teams catch delivery issues before they affect impressions. No account, API key, or extension is needed, and everything runs privately in the browser.
Key features
- Validates VAST 2.0 through 4.3 XML responses.
- Follows wrapper chains and resolves inline creatives.
- Extracts impression, click, and quartile tracking URLs.
- Checks tracking URLs with real HTTP status requests.
- Lists media file details like codec, bitrate, and dimensions.
- Shows IAB error codes with fix recommendations.
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xu Y
