Update profiles tags/details in bulk

Question

Hi everyone, I’m looking for a practical way to bulk update language for existing profiles in Klaviyo.

Context:

We’re a premium dog accessories business based in Portugal (online + retail).
We send emails in English and European Portuguese.
New subscribers can choose their preferred language via our popup and forms, so the language gets captured correctly for them.
The problem is our older subscriber list: many profiles don’t have a language set (or it’s inconsistent).

Right now, the only way I’ve found is editing each profile individually, which is very time-consuming. In many cases we can infer the correct language from name, location, or past engagement.

Question:
What’s the best way to update language in bulk for existing profiles?

Is there a way to do this via a CSV/table import that updates a profile property (for example “Language” or “Preferred language”) without overwriting other data?
If yes, what column naming / format does Klaviyo expect, and are there any gotchas to watch out for?
Bonus: is there a recommended approach to “auto-assign” language based on location, past clicks, or signup source?

Thanks in advance for any tips or step-by-step suggestions.

talha.hussain · Accepted Answer

Hi ​@Jvinagre1,You can update profile tags and details in bulk using a CSV import in Klaviyo. To do this:Export the profiles you want to update.Add or modify the tags/fields in your CSV.Re-import the file into Klaviyo.Make sure you map the columns correctly so the tags/fields update as intended.Klaviyo will match profiles by email and then update the tags or properties you include in the import.

Jvinagre1 · Answer

Thank you very much ​@talha.hussain! I followed your suggestion and this has been sorted.

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