'advertisement in the newspaper' vs 'advertisement on the newspaper'

which one is correct?
i read your advertisement in the newspaper
i read your advertisement on the newspaper

thank you

I’d vote for “in the newspaper”, even though I am reluctant to say “on” is wrong.

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Yes, in combination with the verb “read”, “in the newspaper” is typical.

I’d say the word “on” would be more typical with wording such as this, for example:

  • I saw your advertisement on the front page of the newspaper.
  • I read your advertisement on the newspaper’s website.
  • I took out an advertisement on the Op-ed page of the Boston Globe.
    .

thank- you!