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Merge CSV Columns Safely

Understand how to combine multiple CSV columns after cleaning formatting issues that would otherwise create bad merged output.

Upload a messy spreadsheet

Supports CSV, TSV, XLSX, and XLS. Current plan: Free with files up to 1 MB and 5 analyses per day.

Merged output is only reliable after whitespace, blank-cell, and formatting issues are cleaned.
CleanCSV gives you a cleaner dataset before structural transformations happen downstream.
The report helps you identify whether values are safe to merge.

Not in this version. The current workflow focuses on producing a clean source dataset that is safe to merge afterward.

Trailing spaces, blanks, and mixed formatting often create poor merged output if you combine fields too early.

Upload a messy CSV, detect duplicate rows instantly, and export a cleaner file without rewriting formulas or scripts.

Standardize mixed date formats like YYYY-MM-DD and MM/DD/YYYY into one clean export-ready format.

Detect empty cells, understand which columns are affected, and fill missing values before you export clean data.

Trim leading and trailing whitespace that silently breaks joins, lookups, deduplication, and imports.