InstantToolsPro
✔ 100% Free – No Signup Required
InstantToolsPro
Encode URLs and query strings instantly with smart auto-detection. Build query parameters, decode encoded URLs, and handle special characters — all live.
Type a URL, query string, or plain text. The tool auto-detects whether to encode or decode.
Use "Component" mode for query values, "Full URL" to preserve URL structure characters.
Use the Query Builder to add key-value pairs and auto-generate a fully encoded URL.
One-click copy the result or download as a .txt file. Swap output to input to chain operations.
URL encoding (also called percent-encoding) converts characters that are not allowed in a URL into a format that can be transmitted over the internet. Each unsafe character is replaced by a % followed by two hexadecimal digits. For example, a space becomes %20, and a slash becomes %2F.
encodeURIComponent encodes everything except letters, digits, and - _ . ! ~ * ' ( ). It's used for encoding individual query parameter keys and values. encodeURI preserves URL structure characters like : / ? # @ ! $ & = + , and is used when you need to encode a complete URL without breaking its structure.
The Query String Builder lets you add key-value pairs through a visual interface and generates a fully encoded URL automatically. For example, adding name=John Doe and city=New Delhi generates ?name=John%20Doe&city=New%20Delhi. This is particularly useful for building API endpoints, search URLs, and form submissions.