Online Tool Store
CSV Validator
Paste CSV data and instantly find rows with the wrong column count, unbalanced quotes, or empty rows before you import it anywhere. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Issues
How it works
- Paste your CSV data into the box.
- It's parsed with a quote-aware CSV parser, then every row is checked against the header's column count.
- Any mismatched rows, unbalanced quotes, or empty rows are listed with their line number.
FAQ
What kinds of problems does this catch?
Rows with a different number of columns than the header, unbalanced quote characters, and completely empty rows — the most common causes of a CSV failing to import cleanly.
Does it check character encoding?
No — encoding issues (like a file saved as Latin-1 instead of UTF-8) happen before the text reaches this box, so they are out of scope for a paste-based validator.
Can quoted commas confuse the row-length check?
No — the validator uses a proper RFC 4180-style parser, so a comma inside quotes is treated as part of one field, not a column separator.
Is my data uploaded anywhere?
No — validation happens entirely in your browser as you type or paste.
How we compare
| Feature | Online Tool Store | csvlint.io | Spreadsheet import error |
|---|---|---|---|
| No file upload — paste and check instantly | ✓ | ✗ | ✗ |
| Row-by-row issue list | ✓ | ✓ | ✗ |
| No sign-up | ✓ | ✓ | ✓ |
If a spreadsheet import fails with a vague error, pasting the same data here usually pinpoints the exact row causing it.