Query Builder

Free online tool to build URL query strings from key-value pairs with automatic encoding and duplicate key support. Great for link sharing and API testing.

Query Builder

Build a query string from key-value pairs. Duplicate keys are supported, and values are encoded at the component level automatically.

More URL Tools

Value / Segment→Encoded Segment

URL Encode (url-encode)

Free online tool to encode a single query value, path segment, or hash fragment. It encodes reserved characters like / ? & = # and is ideal for url-encode.

Encoded Segment→Value / Segment

URL Decode (url-decode)

Free online tool to decode a single query value or path segment previously encoded with url-encode. Great for restoring parameter and fragment content.

Query String→Key-Value List

Query Parser

Free online tool to parse URL query strings. Paste a full URL or raw query like a=1&b=2, and it will split and decode the key-value pairs for you.

Key-Value List→Query String

Query Builder

Free online tool to build URL query strings from key-value pairs with automatic encoding and duplicate key support. Great for link sharing and API testing.