---
title: User Agent Parser — Detect Browser, OS & Device Online
url: https://varstatt.com/toolkit/ua
description: Parse any user agent string into browser, OS, engine, and device details. Auto-detects your current browser on load.
section: Developer Toolkit (https://varstatt.com/toolkit)
tags: network
related: HTTP (https://varstatt.com/toolkit/http), CORS (https://varstatt.com/toolkit/cors), User Agent (https://varstatt.com/toolkit/ua)
---
# User Agent Parser

Parse any user agent string into browser, OS, engine, and device details. Auto-detects your current browser on load.

## How It Works

1. **See your browser info** — On load, the tool detects and parses your current browser's user agent string automatically.
2. **Paste any UA string** — Paste a user agent string from logs, analytics, or bug reports to parse it.
3. **Read the breakdown** — Browser name and version, rendering engine, operating system, device type, and CPU architecture are displayed in clear cards.

## FAQ

### What browsers does it detect?

Chrome, Firefox, Safari, Edge, Opera, Samsung Internet, Vivaldi, Brave, Yandex, UC Browser, Internet Explorer, and more. It also identifies bots and crawlers.

### How accurate is UA parsing?

UA strings are notoriously messy — most browsers include legacy tokens for compatibility. This tool uses pattern matching that handles the most common formats, but exotic or spoofed strings may not parse fully.

### Can I detect if a user is on mobile?

Yes. The tool identifies device type as desktop, mobile, tablet, smart TV, or bot based on UA patterns.

### Does this use any external service?

No. All parsing runs entirely in your browser using regex pattern matching. No data is sent anywhere.

## Usage

This tool runs entirely in the browser — visit the URL above to use it.

Prefill inputs via URL parameters:

- `https://varstatt.com/toolkit/ua?input=...`

## Related Tools

- [HTTP](https://varstatt.com/toolkit/http)
- [CORS](https://varstatt.com/toolkit/cors)
- [User Agent](https://varstatt.com/toolkit/ua)