CSV Fixer
Opened a CSV and it looks broken? Weird symbols, numbers turned into 1.2E+15, dates in the wrong order, missing leading zeros? Drop it below — we'll fix it. Nothing leaves your computer.
Drop a CSV here, or click to choose a file
CSV Fixer Pro drops the 50 MB limit and lets you fix a whole folder of CSVs in one go, instead of one at a time.
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Pro unlocked on this browser — no size limit, batch fixing is on below.
Everything happens right here in your browser. Your file is never uploaded anywhere — no server ever sees it. The code is plain, unminified JavaScript: open your browser's developer tools and read every line if you want to.
Common CSV problems
- Excel changed my CSV dates. Here's how to fix it.
- CSV opened with weird characters (é, Ð). Fix the encoding.
- Excel removed the leading zeros from my CSV (zip codes, IDs).
- Excel turned my long numbers into 1.23E+15. Fix it.
- CSV shows all data in one column? Wrong delimiter fix
- How to open a CSV in Excel without changing anything
- Fix ’ and ’ garbled quotes in a CSV file
- Remove the BOM from a UTF-8 CSV ( at the start)
- Excel changed gene names to dates (SEPT1, MARCH1)
- CSV has extra empty rows or columns? How to clean it
- CSV import error: unclosed quote or wrong field count
- Why Excel saves CSV with semicolons (and how to fix it)
- CSV shows ??? or boxes instead of Cyrillic, Chinese, Arabic
- Spaces in CSV cells breaking VLOOKUP and imports
- Open a CSV larger than Excel's 1,048,576 row limit