Column Relationship Detector

What is Column Relationship Detector?

Column Relationship Detector is a free, browser-based tool that helps you understand a dataset at a glance. Spot foreign-key candidates and 1:1 / 1:N relationships. 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 engineers
• Database administrators
• Analytics engineers
• API developers
• Analysts
• Researchers

Recommended workflow

1. 1

   Prepare the input

   Profile the data first so missing values, types, duplicates, and outliers are visible before you edit it.

2. 2

   Run Column Relationship Detector

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

3. 3

   Next recommended tool

   Auto Schema Detector: Infer a schema (types, nullability, uniqueness) from any sample dataset.

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4. 4

   Then continue with

   Data Dictionary Generator: Generate a markdown / CSV data dictionary from any dataset.

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5. 5

   Then continue with

   Metadata Extractor: Extract row count, column types, file size, byte distribution.

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Frequently asked questions

How do I use Column Relationship Detector?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Spot foreign-key candidates and 1:1 / 1:N relationships.

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 Column Relationship 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.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.