Column Relationship Detector Online

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Input CSVCSV166bytes

Columns4

Candidate keys1

Relationships1

Primary key candidates

order_id

Columns	Relationship	Detail
user_id ↔ user_email	1:1	values map one-to-one

Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.

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.

How to use Column Relationship Detector

1Paste your data or drop a file (CSV or JSON).
2Read the generated summary — types, counts, distributions, and any issues found.
3Export the report, or send the data to another tool to act on the findings.

Features

Per-column types, nulls, uniques, and stats
Spot data-quality issues fast
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Quick one-off analyzer jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

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.

Columns

Relationship

Detail

user_id ↔ user_email

1:1

values map one-to-one

What is Column Relationship Detector?

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.