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CSV Validator

Validate CSV structure, headers, row length, duplicate rows, required fields and field types before importing data.

CSV Validator Tool

Check CSV structure, headers, row length, required fields, duplicate rows and field types before importing data.

Validate CSV
This validator helps detect common CSV problems before importing into Excel, Google Sheets, Django, databases, CRMs or email tools.

CSV Input and Validation Settings

Optional. You can also paste CSV below.
Comma-separated header names or column numbers.
If filled, validator checks missing and unexpected columns.
Supported types: text, number, email, url, date, boolean, phone.
0 Rows
0 Columns
0 Errors
0 Warnings
0 Valid Rows

Detected Columns

No columns detected yet.

Validation Report

Valid Rows CSV

Invalid Rows CSV

JSON Issue Summary

Issue Preview

No issues yet. Paste CSV and click Validate CSV.

About This Tool

CSV Validator is a free online data tool that helps you check CSV files or pasted CSV data before importing into spreadsheets, databases, CRMs, Django apps or other systems.

You can upload a CSV file or paste CSV text, choose delimiter, use the first row as headers, check row column counts, detect duplicate headers, detect duplicate rows, set required columns, define expected columns and validate column types such as email, number, URL, date, boolean and phone.

The tool generates a detailed validation report, issue preview, valid rows CSV, invalid rows CSV and JSON issue summary.

This tool is useful for developers, students, data analysts, spreadsheet users, database import preparation, customer data cleanup, product data validation and anyone who needs to detect CSV problems quickly online.

How to Use CSV Validator

1. Paste CSV data or upload a CSV file.
2. Choose the delimiter such as comma, semicolon, tab, pipe or custom delimiter.
3. Choose whether the first row should be used as headers.
4. Choose column count, duplicate header and duplicate row validation options.
5. Optionally enter required columns and expected columns.
6. Optionally add type rules such as email | email | yes.
7. Click Validate CSV.
8. Review errors, warnings, report, issue preview, valid rows and invalid rows.
9. Copy or download the validation report or valid rows CSV.

Privacy Note: This CSV Validator works directly in your browser using JavaScript. The CSV data you paste or upload is processed on the page and is not submitted through a form by this tool.

Frequently Asked Questions

Is this CSV Validator free?

Yes. This CSV Validator is free to use and does not require signup.

Can I upload a CSV file?

Yes. You can upload a CSV or TXT file, and the tool will validate it directly in your browser.

Can it check missing required columns?

Yes. Enter required column names or column numbers, and the tool will report missing columns or empty required values.

Can it validate email, number, URL and date fields?

Yes. Use type rules such as email | email | yes, age | number | no, website | url | no or joined | date | no.

Can I download valid rows only?

Yes. After validation, you can copy or download the valid rows CSV.

Does this tool upload my CSV data to the server?

No. The CSV validation is done directly in your browser using JavaScript and the page does not submit your data through a form.