What schema formats are supported?

JSON Schema (draft-07) and custom YAML rule files.

Can I validate multiple CSVs?

Yes — run the same schema against multiple files and get one combined report.

No. Everything runs locally in your browser.

Process files up to the browser memory limit.

Yes — export the schema for reuse in CI/CD pipelines or future validations.

Validate a CSV file against a JSON or YAML schema definition. Fast, private, and secure browser-based tool with no signups or

Your files never leave your device. Processed locally. 100% private.

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Complete your task perfectly in just three straightforward steps.

Drop your CSV file.

Upload a JSON Schema or define rules manually: required columns, types, constraints.

Validation errors listed with row and column references. Download report.

Instantly see missing columns, type violations, and unique constraint errors.

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