Data Type Detector

What is Data Type Detector?

Data Type Detector is a free, browser-based tool that helps you understand a dataset at a glance. Infer each column's data type. 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
• Analysts

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 Data Type 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.

   Open tool
4. 4

   Then continue with

   CSV Column Analyzer: Per-column types, ranges, uniques, nulls.

   Open tool
5. 5

   Then continue with

   JSON Schema Generator: Infer a JSON Schema from sample data.

   Open tool

Frequently asked questions

How do I use Data Type Detector?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Infer each column's data type.

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 Data Type 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.