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Is the maximum tags for all SE sites (and those in the future) 5?

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    It would seem like this is the case. – Nathan Osman Oct 9 '10 at 17:23
  • So it's not something that can be changed per site – Jonathan. Oct 9 '10 at 19:28
  • @rchern: As this would have a direct relationship to the SE engine itself, I can with confidence say that it is unlikely this will be changed on a per-site basis. – Nathan Osman Oct 10 '10 at 1:28
  • This question belongs on Meta Stack Exchange; it applies to the whole SE architecture in general. – Brock Adams May 31 at 14:42
  • @BrockAdams it was relevant as I was consuming the API. Also this is 9 years ago.. – Jonathan. Jun 2 at 21:17
  • Jeesh, @Jonathan. Next you'll say that Meta Stack Exchange wasn't even a thing when you asked this question. ;) It doesn't change the fact that MSE is the best place for this kind of core-architecture question now. – Brock Adams Jun 2 at 21:52
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At the moment the number of tags allowed on a question is 5. Both client side and server side this limit is now1 enforced at the time of posting.

There is no direct limitation to allow 6 or even 7 tags. As a matter of fact, this query shows 1038 questions at the time of posting that have 6 tags. The revision for one occurrence reveals what caused that 6th tag being added, a CM and their fancy scripts, bypassing all business rules.

However, allowing more tags might run into the length limitation of the field tags in the Posts table. That single field hold the concatenated tagnames, enclosed in < and >. It allows for 250 characters at the moment. As the tagname length has been increased to 35 characters, the technical limit is barely seven tags if those tags all have 35 characters.


1. in the early days of SO this check was broken, as evidenced by this example

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