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ads.txt Validator

To validate your ads.txt file using the ads.txt our Validator, please use one of the following options to enter your ads.txt URL or to copy and paste your ads.txt file.

Enter ads.txt URL

Copy/paste ads.txt file:

What is an ads.txt file?

An abbreviation for “Authorised Digital Sellers”, ads.txt files are the online advertising industry’s latest tool in the battle against ad fraud. The purpose of ads.txt files is to give advertisers and advertising networks the ability to verify who is allowed to sell advertising on your website. This process is automated using “crawlers”, which are automated computer programs which index ads.txt files, much like a search engine. This information is then used by advertisers and ad networks, with this process normally being automated as part of the ad buying process.

How do “ads.txt” files work?

Just like a robots.txt file on your website, the ads.txt file is created at the root of your domain (e.g. https://yourdomain.com/ads.txt). The file is a standard plain-text file which simply contains a list of ad network domain names, each with an associated ID.

What does an “ads.txt” file look like?

The format logically consists of:

  1. A non-empty set of records, separated by line breaks. The records consist of a set of lines of the form: <FIELD #1>, <FIELD #2>, <FIELD #3>, <FIELD #4> or =.
  2. Records contain comma-separated fields, 3 fields are required, 1 field is optional.
  3. An ads.txt file can include comments, by simply beginning a line with a hashtag the rest of the line will not be indexed by crawlers.
  4. An ads.txt file can also contain contact information, and if the website uses subdomains then these can be referenced to inform crawlers that additional ads.txt files exist on these subdomains.

Example ads.txt file:

google.com, pub-770011223344550606, DIRECT, f08c47fec0942fa0
admixer.net, E1DF631C-1269-4EF3-A0FF-452A8B59DCB2, RESELLER
# An example comment
adtech.com, 11456, DIRECT #next comment
contact=support@windows10gadgets.pro
contact=https://windows10gadgets.pro/contact.html
subdomain=blog.domain.com
subdomain=news.domain.com

The ads.txt specification specifies that whilst the records in an ads.txt file must follow the defined structure, the basic formatting of the file is not strict. For example, the presence or lack of spaces around the comma delimiters, and the presence of white-space between records will not affect how the ads.txt file is crawled. The text file can be created just like any other text file, using any text editor, on any computer operating system.

What does this ads.txt validator check for?

Errors

Errors are serious issues which may invalidate your ads.txt file or cause lost revenue, they must be resolved immediately.

  1. Incorrectly formatted data records and variables.
  2. Invalid or incorrect exchange domains, publisher IDs, relationship values, and certification authority IDs.
  3. Invalid lines which are not valid ads.txt records.

Warnings

Warnings highlight points of concern but which should not affect the processing of your ads.txt file, but which should be resolved as soon as possible.

  1. Potentially invalid exchange domains.
  2. Invalid variable names (not CONTACT or SUBDOMAIN).
  3. Invalid contact and subdomain variable values.
  4. Duplicate ads.txt records (comments will be ignored, including inline comments included after data records).

Notices

Notices provide information on how to improve the formatting of your ads.txt file.

  1. Inconsistent case and unnecessary whitespace.

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