Parse User-Agent String
This user-agent parser is a browser tool that identifies likely browser family, operating system, and device type from a user-agent string.
Quick Usage
- Paste a full user-agent string from logs, headers, or browser diagnostics.
- Click Parse User-Agent to classify browser, OS, and device type.
- Use the output as a quick diagnostic signal, then validate edge cases manually.
Inputs and Outputs
| Type | Field | Details |
|---|---|---|
| Input | User-Agent String | Any valid text user-agent value, such as a request header from browser, app, or crawler. |
| Output | Browser | Browser family label (for example Chrome, Safari, Firefox, Edge, Opera, or Unknown). |
| Output | Operating System | Likely OS family (for example Windows, macOS, Android, iOS, Linux, or Unknown). |
| Output | Device Type | Desktop, Mobile, Tablet, or Unknown based on pattern rules. |
Examples
| Sample Scenario | Example Input Pattern | Expected Classification |
|---|---|---|
| Desktop Chrome on Windows | Mozilla/5.0 ... Windows NT 10.0 ... Chrome/122.0 ... |
Browser: Google Chrome, OS: Windows 10/11, Device: Desktop |
| Mobile Safari on iPhone | Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) ... Safari/604.1 |
Browser: Apple Safari, OS: iOS, Device: Mobile |
| Android tablet edge case | Mozilla/5.0 (Linux; Android 14; Tablet) ... |
Device may be Tablet if mobile token is absent; verify manually for ambiguous strings. |
How This Parser Compares
| Feature | Our User-Agent Parser | Typical Free Parsers | Typical Full Analytics Suites |
|---|---|---|---|
| Setup | Paste and parse instantly | Usually instant | Requires integration work |
| Transparency | Simple rule-based output | Varies by tool | Often abstracted |
| Best For | Quick debugging and manual checks | One-off checks | Long-term analytics pipelines |
| Limitations | No fingerprinting, no certainty claims | Often similar limits | Higher complexity and cost |
Privacy and Limitations
- Parsing runs in your browser on this page.
- This tool classifies user-agent strings by pattern checks, not by guaranteed device identity.
- It does not perform bot scoring, geolocation, or fingerprint-based identification.
- Spoofed, reduced, or frozen user-agent strings can lead to unknown or approximate results.
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User-Agent Parser FAQ
What is a user-agent parser?
A user-agent parser is a tool that reads the user-agent header text sent by a browser or app and maps it to likely browser, operating system, and device type.
Is this user-agent parser accurate for all devices?
No parser is perfect. User-agent strings can be reduced, frozen, spoofed, or customized. This tool is best for quick debugging and log inspection, not strict device fingerprinting.
Does this tool store user-agent strings?
No. Parsing runs in your browser. Inputs are not sent to a backend by this page.
Why does one user-agent include multiple browser names?
Many browsers include compatibility tokens like Mozilla, Safari, and AppleWebKit. A parser checks ordering rules and specific tokens to infer the most likely browser family.
Can I detect bots with a user-agent parser?
You can spot obvious bot user-agents, but spoofing is easy. Reliable bot detection usually combines user-agent checks with behavior and network signals.
What is the difference between mobile and tablet detection?
Detection is based on token patterns, for example iPad or Android with and without Mobile tokens. Some devices report ambiguous strings, so classification is approximate.
Can this parser detect browser version?
This page focuses on browser family, OS, and device type. Version extraction is possible from many user-agent strings, but version formats vary and can be missing.
Is user-agent parsing enough for analytics?
It is useful for top-level segmentation and debugging. For analytics decisions, combine it with first-party event data and privacy-safe aggregation.