ImportPilot

Duplicate CSV Header Fixer

Fix duplicate and missing CSV headers before importing data into tools that require unique column names.

Privacy-first: files never leave this device.

Duplicate or empty headers are a common reason CSV imports fail even when the rows look fine.

  • Renames duplicate headers with stable suffixes.
  • Fills missing headers with Column N names.
  • Shows header changes in the before/after preview.
Open ImportPilot CSV cleaner overview

Before

Name,Name,,Amount

After

Name,Name_2,Column 3,Amount
CSV Cleaner Clean messy CSV files locally in your browser before importing them into spreadsheets, CRMs, ecommerce tools, or databases. CSV Delimiter Fixer Detect and fix comma, semicolon, tab, and pipe delimiters in CSV, TSV, and TXT files. CSV Encoding Fixer Preview and fix CSV encoding issues including UTF-8, UTF-8 BOM, Windows-1252, and Windows-1253 where supported. European Decimal CSV Converter Convert European decimal values like 1.234,56 or € 2.450,00 to import-friendly 1234.56 format. CSV Date Normalizer Normalize CSV dates to YYYY-MM-DD with European or US interpretation for ambiguous slash dates.