Is User-Agent Info free?

Yes. User-Agent Info is free to use and needs no account or sign-up.

Is my data sent anywhere?

No. Everything you enter is processed inside your browser and is not sent to a server.

Once the page has loaded, processing needs no internet connection.

Yes. It works in current mobile browsers on Android and iPhone, as well as on desktop.

Parsing is heuristic; user-agent strings can be faked and are partly frozen in modern browsers.

See your browser’s user agent and client hints, or parse any user-agent string.

Is User-Agent Info free?: Yes. User-Agent Info is free to use and needs no account or sign-up.
Is my data sent anywhere?: No. Everything you enter is processed inside your browser and is not sent to a server.
Does it work offline?: Once the page has loaded, processing needs no internet connection.
Does it work on phones?: Yes. It works in current mobile browsers on Android and iPhone, as well as on desktop.
Are there any limitations?: Parsing is heuristic; user-agent strings can be faked and are partly frozen in modern browsers.

HTTP Header Parser — Tidy raw HTTP headers, export them as JSON and check common security headers.
URL & Query String Parser — Break a URL into its parts and edit query parameters. Includes a UTM builder.
JSON Formatter & Validator — Format, validate and minify JSON, with the exact position of syntax errors.
Base64 Encoder / Decoder — Encode text to Base64 or decode it back. UTF-8 safe, including Hindi.
URL Encoder / Decoder — Percent-encode or decode text for use in URLs.
HTML Entity Encoder / Decoder — Escape characters as HTML entities, or decode entities back to text.