Meet the Developer
Paulo Nakanishi
Senior BI Analyst (Ex-iFood, HP)
Built DataMani to solve my own data engineering problems. Passionate about Python, Automation, and Privacy-first tools.
LINKEDIN PROFILESecurely merge multiple Excel files or split huge CSV datasets directly in your browser. No signup, no limits, 100% free.
Last Updated: January 2026 • Version 2.1
Combine multiple Excel (XLSX, XLS) or CSV files into a single spreadsheet instantly. Free, secure, and runs in memory. No file size limits.
Divide large CSV files (1GB+) into smaller, manageable chunks (e.g., 1M rows) for Excel. Free splitter tool, no signup required.
DataMani was built to solve the daily headaches of Data Analysts and BI professionals. Unlike other tools that upload your sensitive data to cloud storage, we process everything in temporary RAM memory. Once you close the tab, your data is gone forever.
Senior BI Analyst (Ex-iFood, HP)
Built DataMani to solve my own data engineering problems. Passionate about Python, Automation, and Privacy-first tools.
LINKEDIN PROFILE