Klaviyo List Splitter
2025
Privacy-first CSV splitter for A/B testing and email marketing segmentation with custom ratios.
About
Klaviyo List Splitter is a privacy-focused web tool that splits CSV files into random groups with custom ratios, perfect for A/B testing and email marketing campaigns. The tool processes everything directly in your browser - no data ever leaves your device. Simply upload a CSV file, choose how many groups you want (2-10), set custom percentage allocations for each group, and download a ZIP file containing your segmented lists. Built specifically for email marketers and data analysts who need to quickly segment customer lists for testing different campaigns, creating holdout groups, or splitting audiences for targeted messaging. The tool ensures complete randomization while maintaining the exact ratios you specify.
My Role
Founder
Key Achievements
- 100% client-side processing for complete data privacy
- Support for 2-10 custom groups with precise percentage allocation
- Drag-and-drop file upload interface
- Automatic ZIP file generation with segmented lists
- No server-side data storage or transmission
- Perfect for A/B testing and holdout group creation