Invalid Row Detector

What is Invalid Row Detector?

Invalid Row Detector is a free, browser-based tool that helps you catch errors before they reach production. Flag rows that violate a schema or per-column constraints. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

Used by

• Data analysts
• Operations teams
• Researchers
• QA engineers
• API testers

Recommended workflow

1. 1

   Prepare the input

   Validate the raw input first so syntax or structure errors are caught before downstream tools touch it.

2. 2

   Run Invalid Row Detector

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

   Next recommended tool

   Data Standardizer: Normalize a column to a chosen format (e.g. dates, currencies, casing).

   Open tool
4. 4

   Then continue with

   Detect Corrupted Rows: Spot rows with shape or type mismatches.

   Open tool
5. 5

   Then continue with

   Inconsistent Data Finder: Flag inconsistent formats inside a column.

   Open tool

Frequently asked questions

How do I use Invalid Row Detector?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Flag rows that violate a schema or per-column constraints.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is Invalid Row Detector free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Does it explain the errors it finds?

Yes — each problem is reported with the line number and a plain-English description so you can fix it quickly.