Free Online CSV Validator

Paste CSV below and click "Check & Suggest Fix" to confirm it parses cleanly.

Input Ready

Input statistics are available via the Stats button above this field.

Output

Output statistics are available via the Stats button above this field.

Results are provided for informational purposes only and may contain errors. Please verify important information independently. Use of this tool is at your own risk.

What the CSV Validator does

The CSV Validator parses your file the same way the converter does and reports rows that do not fit the header: missing fields, extra fields and unterminated quotes, with the line number of the first problem.

It detects comma and semicolon delimiters automatically and understands quoted fields, so a comma or a line break inside "quotes" is treated as data, not as a new column or row. Blank lines at the end of the file are not treated as errors.

When to use it

  • Before importing a file into a database, CRM or script, so a malformed row does not stop the import halfway.
  • Checking an export from Excel or another system that produced unexpected columns.
  • Confirming a file is clean before converting it with the CSV to JSON Converter or the CSV to Excel (XLSX) Converter.
  • Finding the one row in a large export that has an extra comma or an unclosed quote.

Worked example

Input

name,age,city
Ana,30,Lisbon
Ben,25
Cara,41,"Porto"

Output

Too few fields: expected 3 fields but parsed 2 (Line 3)

Suggestion: Make sure every row has the same number of columns as the header row, and that any field containing a comma or quote is wrapped in double quotes.

Common questions about the CSV Validator

What does 'Too few fields' mean?

A row has fewer values than the header has columns, usually because a value is missing at the end or a comma was dropped. The message gives the line so you can add the empty field.

How do I include a comma inside a value?

Wrap the whole value in double quotes, like "Lisbon, Portugal". To include a double quote inside a quoted value, write it twice: "".

Does it check data types or required values?

No. It checks structure only: that every row lines up with the header and that quoting is correct. Business rules such as valid dates or unique IDs need to be checked in your own tool.

Is this tool free?

Yes, it's free to use. No signup, no email required. Get results on this page.

How do I get my result?

Use the tool on this page. Your result appears here; no email delivery is required.