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100% free · no signupRuns in your browser

User-Agent Parser

Parse a User-Agent string into browser, OS and device class.

Best for: Use it to debug device-specific issues, read a log entry, or check what a client reports.

Complete guide

Input

How it's calculated & sources
The User-Agent Parser uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is User-Agent Parser?
A user-agent parser breaks a browser's User-Agent string into readable parts - browser, version, engine, operating system and device.
Why does User-Agent Parser matter?
A readable breakdown of the client. User-Agent strings are self-reported and can be spoofed or frozen, so treat them as hints.
How is User-Agent Parser calculated?
It matches the raw string against known patterns to identify each component, in your browser.
What are common user-agent parser mistakes?
Trusting the User-Agent as proof of the real browser/device - it can be faked.
When should you use the User-Agent Parser?
Use it to debug device-specific issues, read a log entry, or check what a client reports.

What is the User-Agent Parser?

A user-agent parser breaks a browser's User-Agent string into readable parts - browser, version, engine, operating system and device.

How the User-Agent Parser works

It matches the raw string against known patterns to identify each component, in your browser.

Common mistakes to avoid

  • Trusting the User-Agent as proof of the real browser/device - it can be faked.
  • Relying on it for security decisions.
  • Assuming modern 'frozen' UA strings give exact versions.

Keywords: user-agent, ua, parser.

Runs entirely in your browser - your data is not uploaded.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the User-Agent Parser free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the User-Agent Parser?+

User-Agent Parser uses the standard user-agent parser formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The User-Agent Parser runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the User-Agent Parser on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Reddit post
Title: I built/used this free user-agent parser — instant, no signup

Body: Parse a User-Agent string into browser, OS and device class. Try it: https://freetoolsgalaxy.com/tools/user-agent-parser
LinkedIn post
User-Agent Parser on Free Tools Galaxy — Parse a User-Agent string into browser, OS and device class. https://freetoolsgalaxy.com/tools/user-agent-parser
Medium intro
# User-Agent Parser — the free tool I keep coming back to

Parse a User-Agent string into browser, OS and device class.

Try it: https://freetoolsgalaxy.com/tools/user-agent-parser
Quora answer
The fastest way is to use a free in-browser user-agent parser: https://freetoolsgalaxy.com/tools/user-agent-parser. Parse a User-Agent string into browser, OS and device class.

Embed this tool anywhere

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HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/user-agent-parser?embed=1" title="User-Agent Parser" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/user-agent-parser" target="_blank" rel="noopener">Powered by User-Agent Parser on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/user-agent-parser?embed=1" title="User-Agent Parser" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[User-Agent Parser — free online tool](https://freetoolsgalaxy.com/tools/user-agent-parser)

<iframe src="https://freetoolsgalaxy.com/tools/user-agent-parser?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/user-agent-parser" target="_blank" rel="noopener">Try the free User-Agent Parser</a>

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Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free fraction calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick fraction calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard fraction use cases (fraction, math) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/fraction-calculator

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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