URL Encoder converts any text string into percent-encoded format so it can be safely embedded in URLs, query parameters, form POST bodies, and HTTP headers. Characters like spaces, &, =, ?, #, and non-ASCII letters have special meanings in URLs and must be encoded before use. This tool encodes your text instantly using encodeURIComponent() logic — all in your browser, nothing uploaded.
URL encoding (also called percent-encoding) replaces each unsafe byte with a % sign followed by two hexadecimal digits representing the byte value. RFC 3986 defines which characters are "unreserved" (safe: A-Z a-z 0-9 - _ . ~) and which must be encoded. encodeURIComponent() encodes everything except unreserved characters, making it the correct choice for encoding query parameter values.
encodeURI encodes a full URL but leaves reserved chars (; , / ? : @ & = + $ #) unencoded. encodeURIComponent encodes everything including those chars, making it correct for individual query parameter values. This tool uses encodeURIComponent behavior.
RFC 3986 percent-encoding represents spaces as %20. The + sign for spaces is only used in application/x-www-form-urlencoded format (HTML form submissions). For URL query parameters, %20 is the correct encoding.
Unreserved characters (A-Z, a-z, 0-9, hyphen, underscore, period, tilde) are never encoded. All other characters including spaces, @, #, &, =, +, and non-ASCII chars are encoded.
No. Encoding runs entirely in your browser. Nothing is ever uploaded.
Yes. Use the URL Decoder tool to convert percent-encoded text back to the original string.
Yes, completely free. No login, no limits.
Tool workspace
Free URL encoder online — instantly percent-encode any string for safe use in URLs, query strings, and API requests. Converts spaces, symbols, and special chars. No login.
Output
Input
hello world & more=stuff
Output
hello%20world%20%26%20more%3Dstuff
