Free tool
Percent-encode query parameters, special characters, and tracking strings into valid RFC 3986 URI formats.
wool%20overcoat%20180Uniform Resource Identifiers (URIs) can only contain a limited set of ASCII characters. Reserved characters (such as &, =, ?, /, #) have special syntactical meaning defining query string boundaries and paths. When dynamic user inputs, product names, or tracking values contain spaces or reserved characters, they must be percent-encoded (e.g., space becomes %20, & becomes %26) to prevent broken links and corrupted server routing.
JavaScript provides two distinct encoding functions: encodeURI is designed for complete URLs, preserving protocol schemes (https://) and path slashes (/). In contrast, encodeURIComponent is designed for individual query string parameters, aggressively encoding all reserved characters so an entire URL can be safely passed inside another query parameter.
Marketing tracking tags, payment redirect callback URLs (e.g., Stripe, Razorpay, PayPal return_url), and faceted filter parameters rely heavily on percent-encoding. Failing to encode parameter values causes web servers to misinterpret query boundaries, leading to broken checkout handoffs and lost session tracking.
Reserved characters like &, =, and ? define URL structure. If an unencoded parameter value contains an ampersand (e.g., category=Books & Games), the server interprets '& Games' as a new, separate parameter, corrupting data parsing.
%20 represents standard percent-encoded space in URI paths and modern query strings (RFC 3986). The plus sign (+) is historical encoding used specifically in application/x-www-form-urlencoded query strings and HTML form submissions.
Yes. If an already-encoded string containing %20 is passed through an encoder again, the percent sign is encoded to %25, resulting in %2520. Always ensure strings are encoded only once at the point of parameter assembly.
Modern browsers display internationalized domain names (IDN) and Unicode characters, but underlying network protocols require non-ASCII Unicode characters to be percent-encoded into valid UTF-8 octets.
Decode percent-encoded URLs, query string parameters, and tracking strings into clean human-readable text.
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