Ads.txt validator

This is a structure check against the IAB Tech Lab record shape: field order, DIRECT and RESELLER types, the optional certification authority ID, comments, and duplicate seller entries. A well-formed file is not a proof of authorization. It only means the lines parse. To confirm a seller actually represents you, look the account ID up with the exchange named on the line. The file is checked as pasted, so if your server answers with an HTML error page instead of plain text, that will not show up here.