Inspect streaming ad tags for CTV and media apps: decode VAST URLs, review query params and catch common player-debugging issues.
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CTV / Ad Tech · VAST inspector
VAST / Ad Tag Inspector
Paste a streaming ad tag URL to decode VAST query params, review CTV and media-app signals, and spot common issues before debugging them in a player. Everything runs client-side.
Empty values: correlator.
Some values are URL-encoded and were decoded for readability.
Base URL
https://pubads.g.doubleclick.net/gampad/ads
Param
Decoded value
Notes
iuknown
/1234/video
Ad unit path (Google Ad Manager).
description_urlknown
https://example.com/watch
Describes the content page for the ad request.
tfcd
0
npa
0
szknown
640x480
Ad slot size(s), e.g. 640x480.
gdfp_reqknown
1
Google Ad Manager request flag.
outputknown
vast
Response format, e.g. vast / xml_vast4.
unviewed_position_startknown
1
Delay impression until the ad is viewable.
envknown
vp
Environment, e.g. vp = video player.
correlatorknown
empty
Groups ad requests from the same page view.
cust_paramsknown
section=sports&page=live
Key-value targeting — itself a URL-encoded query string.