VAST validator

Paste a VAST tag URL or the document itself. The tool parses the structure, walks the wrapper chain, and plays the ad in a real player.

VAST tag URL

Placement

Instream is a preroll before content video. Outstream is an in-page slot that starts when it scrolls into view.

Tracking pixels

Pixels are rewritten to our own address and never leave: nobody else's numbers move and no budget is spent. Verification scripts are not loaded in this mode either.

VPAID mode

The player sandboxes VPAID units by default. Insecure mode gives the unit access to the page, which is how many production players run it.