PunkFix

Validate CSV Schema

Check if file matches required columns and data types. 100% private—your data stays in your browser.

No uploadsNo signupInstant results
1

Upload Your CSV

Drop a file to check its structure and data types.

2

Schema Validation

We verify column consistency, data types, and required fields.

3

View Report

See detailed validation results and any issues found.

Click to upload or drag & drop

Supported files: CSV, TXT, JSON (Max 20MB)

Drop your file here

or click to browse

Any CSV file you want to validate before importing.

Max 20MB 100% Private

What This Tool Does

This tool allows you to define a set of required rules (column names, types) and checks if your uploaded file adheres to them, generating a report of violations.

How It Works

1Upload the CSV to be tested.
2Define the expected schema (or infer it from a master file).
3The tool scans for mismatched headers or invalid data formats.
4Read the validation report.

Input Format

A CSV file and a set of rules.

Output Format

A Pass/Fail report and the validated file.

When to Use This Tool

  • Verifying user uploads before processing.
  • Checking if a vendor file matches the spec.
  • QA testing large datasets.

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