Developer utility by Jan IT
Encode, decode, inspect URLs, and shape query strings in one fast static page, integrated with the Jan IT brand and designed for privacy-conscious everyday use.
Use this free browser-based URL encoder, URL decoder, URL parser, query string parser, and query string builder to inspect links and transform parameters without sending data to any server.
Privacy-friendly by design
This is a privacy-friendly browser-only URL toolkit. All processing happens locally in your browser. Nothing is sent to a server.
Switch between URI and component-safe transforms with friendly decode errors.
Use encodeURI() for full URLs and encodeURIComponent() for individual
parts like query values. Decode modes use the browser’s built-in URI decoders and surface malformed
input safely.
MDN: encodeURI MDN: encodeURIComponent MDN: decodeURIComponent
Uses the browser URL API to break a full URL into its practical parts.
href
https://dev.example.com:8080/path/to/page?tab=docs&sort=desc&tag=svelte&tag=kit#api
origin
https://dev.example.com:8080
protocol
https:
username
—
password
—
host
dev.example.com:8080
hostname
dev.example.com
port
8080
pathname
/path/to/page
search
?tab=docs&sort=desc&tag=svelte&tag=kit
hash
#api
The parser uses the browser’s URL API, which normalizes and exposes parts
like origin, pathname, search, and hash.
Paste a query string and turn it into editable key-value rows.
Query parsing here is powered by URLSearchParams, which preserves entry order
and supports repeated keys.
Build a canonical query string from the editable rows using URLSearchParams.
Empty rows are ignored. Duplicate keys are preserved in insertion order.
The builder uses URLSearchParams serialization, which makes it a handy way to generate
valid query strings directly in the browser.