Repair CSV Files Online
Repair malformed CSV files directly in your browser. Fix unbalanced quotes, inconsistent column counts, BOM markers, and mixed line endings — no upload required.
Drop your .csv file here
or click to browse — max 50 MB
About this tool
Fix common structural problems in CSV files that cause other tools to choke. Detects and repairs BOM markers, mixed line endings, unbalanced quotes, and inconsistent column counts. Run this first when a file refuses to load elsewhere.
Frequently Asked Questions
What issues can the CSV repair tool fix?
BOM markers, mixed line endings (\r\n vs \n), unbalanced quotes, and inconsistent column counts. The tool detects each issue and applies targeted fixes.
Will the repair tool lose any data from my CSV file?
The tool is conservative — it normalises line endings, strips BOM, closes unclosed quotes, and pads short rows with empty values. No rows are deleted. Always review the before/after preview.
Why does the tool fail to read my CSV file?
Common causes are unbalanced quotes, inconsistent delimiters, BOM characters, or mixed line endings. Run the file through this repair tool first, then load the repaired version into any other tool.
Is my data private?
Yes — completely. Your file is never uploaded to any server. Everything runs locally in your browser using WebAssembly — processing happens entirely inside your tab. Once you close the tab, nothing is retained.
What is the maximum file size?
The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines handle 500 MB to 1 GB comfortably.
Related Tools
Convert CSV to Parquet Online
Convert CSV files to Parquet format directly in your browser. No upload required — your data never leaves your device.
Convert CSV to JSON Online
Convert CSV files to JSON format directly in your browser. No upload required — your data never leaves your device.
Convert CSV to NDJSON Online
Convert CSV files to NDJSON format directly in your browser. No upload required — your data never leaves your device.
Convert CSV to TSV Online
Convert CSV files to TSV format directly in your browser. No upload required — your data never leaves your device.
Convert CSV to Arrow Online
Convert CSV files to Arrow format directly in your browser. No upload required — your data never leaves your device.