Validate structure, then create a repaired copy

Repairs are deliberately conservative: normalize row width, make blank/duplicate headers usable, trim cell edges, remove blank rows, and optionally drop exact duplicate rows.

Load CSV/TSV

Delimiter

Delimited data

Trim cell edges Remove blank rows Normalize headers Remove exact duplicates

—Issues found

—Repaired shape

Private browser-first tabular workflow

v10.78 connects viewing, editing, validation, cleanup, conversion, joining, reshaping and spreadsheet import/export around the established CSV/Excel tools. Text and supported workbook files are handled in browser memory; large files remain limited by device memory and browser rendering cost.

CSV and spreadsheet boundaries

CSV has no universal schema or type system. Delimiter detection and type summaries are practical heuristics, while repairs create a new copy instead of silently altering the source. Excel conversion focuses on cell values and simple worksheets rather than promising perfect preservation of formulas, macros, charts, external links, formatting or every workbook feature.

How to use this CSV Validator & Repair

Inspect CSV structure for uneven rows, blank or duplicate headers, blank rows, edge whitespace, and exact duplicates, then create a repaired copy locally.

Enter, paste, upload, or choose the inputs shown in the tool above.
Adjust the available options for the result you need.
Review the output before copying, downloading, or using it elsewhere.

What this tool does

Paste or load CSV/TSV, review concrete structural issues, choose safe cleanup options, preview the repaired table, and download a new file without changing the original.

Practical tips and limits

Review the inputs and result before using the output elsewhere. Keep the original data when the operation changes or replaces content.