URL Encoder / Decoder

Component mode uses encodeURIComponent for query values and path segments. It escapes structural characters such as : / ? # & and =, but leaves the encodeURIComponent exceptions !'()* unescaped. Full URI mode uses encodeURI and preserves more URL structure. Neither mode builds a query string or validates a complete URL for you.

Every percent sign in a URL must be followed by exactly two hex digits (0-9, A-F). Sequences like %ZZ, a lone %, or %A at the end of the string are invalid and trigger this error. If you want a literal percent sign in your output, encode it as %25 first, then decode.

This tool encodes a space as %20 in both Component and Full URI modes, following the URL standard (RFC 3986). The plus sign (+) means a space only in HTML form bodies (application/x-www-form-urlencoded), which is a different encoding scheme. If you paste a URL that contains a +, this tool leaves it as + when decoding rather than turning it into a space.

Each non-ASCII character is first converted to its UTF-8 byte sequence, then each byte is percent-encoded. An accented letter like "e" with an accent produces two percent triplets, and a 4-byte emoji produces four. Decoding reverses the process and gives back the original character.

Do not paste live API keys, session tokens, signed URLs, or other credentials into a third-party page. This component performs the conversion in browser memory, but extensions, compromised scripts, clipboard history, screenshots, and device malware are outside its control. Use redacted or disposable test values.