# User Agent Parser

> Break down a user-agent string into browser, engine, operating system and device.

To parse a user-agent string, paste it above and the browser, rendering engine, operating system and device are identified. This is the quickest way to decode the strings in your server logs when investigating a browser-specific bug.

**URL:** https://convertto.tech/t/user-agent-parser
**Category:** Developer Tools (https://convertto.tech/c/developer-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your user agent string.
2. The result appears immediately — copy or download it.

## FAQ

### Why does every user agent start with Mozilla/5.0?

Legacy browser sniffing. In the 1990s servers checked for "Mozilla" before sending modern HTML, so every browser started claiming it. The prefix has been meaningless for decades but removing it would break old sites.

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