Common Klaviyo CSV Import Failures We Solve
Klaviyo enforces strict syntax rules for SMS compliance and customer property mapping. Here is how CleanMyCSV repairs your subscriber lists:
1. Klaviyo SMS Consent Rejections (E.164 Requirement)
Klaviyo SMS requires phone numbers formatted in strict international E.164 standards (e.g. +15550192834 or +33612345678). Unformatted numbers (06.12.34.56.78) cause Klaviyo to skip SMS consent imports entirely. CleanMyCSV cleans formatting, restores dropped zeros, and prepends correct country codes.
2. Broken First Name Merge Tags ({{ first_name }})
Sending email flows with broken accents like "Hi Élodie" ruins brand trust and drops click-through rates. Our UTF-8 BOM engine auto-fixes corrupted character encodings and capitalizes proper names cleanly.
3. Email Syntax Normalization & Deduplication
Emails containing trailing spaces, typos (.con instead of .com), or accidental uppercase letters create duplicate profiles in Klaviyo. CleanMyCSV normalizes email strings and deduplicates your lists prior to import.
4. Truncated ZIP Codes for Location Segments
Building location-based Klaviyo segments relies on precise postal codes. Excel strips initial zeros from East Coast US (02110) and European zip codes (06100). CleanMyCSV pads missing zeros back to standard 5-digit formats.