Private by design
Customer lists, financial exports, and operational data are processed only in your browser.
FREE, PRIVATE DATA TOOLS
CSV tools that keep
your data private.
Check and repair errors, convert encoding, remove duplicates, split large files, and move between CSV and Excel — all in your browser.
✓ No signup✓ Browser-only processing✓ Nothing retained
Upload a CSV file to check it
Your data never leaves your browser
Drop a CSV file here
Choose a file
CSV, TSV or text · up to 50 MB
THE DATA REPAIR TOOLBOX
Pick the problem.
Get a working file.
Each tool solves a specific file problem. There is no account, no upload queue, and no need to learn CSV jargon.
✓FIX · TOOL 01↗
CSV Checker & Fixer
Upload a CSV to spot malformed rows, duplicates, whitespace, encoding trouble, uneven columns, and other common import problems.
Open tool →UTFFIX · TOOL 02↗
CSV Encoding Fixer
Repair strange characters and convert legacy CSV files to widely compatible UTF-8 while keeping Japanese and other Unicode text intact.
Open tool →≠CLEAN · TOOL 03↗
Remove CSV Duplicates
Count and remove completely identical data rows. The header and first occurrence stay exactly where they are.
Open tool →÷TRANSFORM · TOOL 04↗
CSV Splitter
Choose the maximum data rows per file and download a ZIP of numbered CSV parts, each with the original header.
Open tool →XLSCONVERT · TOOL 05↗
CSV to Excel Converter
Convert a CSV to a simple Excel workbook with Unicode text preserved and no upload to a server.
Open tool →CSVCONVERT · TOOL 06↗
Excel to CSV Converter
Open an XLSX file, choose a worksheet, preview it, and download a UTF-8 CSV locally.
Open tool →BUILT FOR REAL BUSINESS FILES
Sensitive data deserves a quieter kind of tool.
Safe before clever
Deterministic repairs are separated from problems that need a human decision. Nothing ambiguous is silently changed.
Useful immediately
The tool comes first. Short explanations appear after the workflow, where they help without getting in the way.