Hi everyone, I’m looking for a practical way to bulk update language for existing profiles in Klaviyo.
Context:
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We’re a premium dog accessories business based in Portugal (online + retail).
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We send emails in English and European Portuguese.
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New subscribers can choose their preferred language via our popup and forms, so the language gets captured correctly for them.
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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?
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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?
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If yes, what column naming / format does Klaviyo expect, and are there any gotchas to watch out for?
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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.
