Outlier Detector

What is Outlier Detector?

Outlier Detector is a free, browser-based tool that helps you understand a dataset at a glance. Flag statistical outliers in numeric columns. 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 Outlier Detector

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

3. 3

   Next recommended tool

   Column Statistics: Min/max/mean/median/stddev/quartiles for every numeric column.

   Open tool
4. 4

   Then continue with

   Standard Deviation: Compute σ and variance per column.

   Open tool
5. 5

   Then continue with

   Z-Score Calculator: Per-row z-scores for any numeric column with outlier highlights.

   Open tool

Frequently asked questions

How do I use Outlier Detector?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Flag statistical outliers in numeric columns.

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 Outlier 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.