Free Crypto Transaction CSV Checker
Check UTF-8 CSV and TSV ledgers with date, asset and amount fields directly in your browser. Review column mappings, invalid dates and amounts, fee currencies, possible duplicates across files, and expected period coverage. Download an issues CSV or full JSON report. No file contents are uploaded. Activity gaps are review hints, not proof of missing transactions; records are never deleted automatically. Excel and split buy/sell exports are not supported. This tool does not calculate tax or cost basis.