From VAST URL to validated report in seconds
No configuration required. Paste a URL and get a complete audit.
Paste URL or upload XML
Drop in a VAST tag URL or paste raw XML. We handle both inline VAST and multi-level wrapper redirects — no configuration needed.
We audit everything
Wrapper chains are resolved hop by hop, XML is validated against the schema, and media files are inspected for resolution, bitrate, codec, and duration.
Review your report
A persistent, revisitable report with every finding — schema errors, warnings, media specs, and a live preview of the creative.
Everything you need to ship clean VAST
A complete audit suite for ad ops teams, publishers, and anyone managing VAST tags at scale.
Wrapper chain resolution
Follows every redirect hop until reaching the inline VAST, mapping the full chain and flagging broken or circular links.
XML schema validation
Validates document structure against VAST 2.0, 3.0, and 4.x specifications, reporting every violation with context.
Media file analysis
Inspects video codec, bitrate, resolution, and duration — surfacing compliance issues before the tag goes into rotation.
Creative preview
Plays the ad creative directly in the validator so you can confirm it renders correctly before signing off.
Persistent project reports
Every validation run is saved to your workspace. Revisit or compare reports at any time.
Errors & warnings breakdown
Every issue is categorised by severity — errors that block delivery, warnings to review, and informational findings.
Debugging a specific error code? Browse the VAST error codes reference — every code from 100 to 902 with causes and fixes.
Know when your VAST tag breaks — before your revenue does
We're building continuous monitoring on top of the validator: scheduled re-checks of your tags, latency and availability history, and instant alerts when a tag stops returning valid VAST or a media file goes bad.
Get early access to VAST tag monitoring
Drop your email and we'll let you know when monitoring opens up — and ask what you'd want alerted on first.