URL Encoder & Decoder

A URL encoder converts characters that are not allowed in URLs — like spaces, &, =, and # — into percent-encoded form (% followed by two hex digits). For example, a space becomes %20. This is the standard way to safely pass user input in query strings and path segments.

Use a URL encoder when passing query string parameters that may contain special characters, when building API requests with dynamic values, when embedding URLs in HTML attributes, or when debugging percent-encoded strings returned by a backend service.

encodeURI encodes a full URL while preserving characters like /,?, and &. encodeURIComponent encodes a single component — such as a query value — including those reserved characters. This URL encoder uses encodeURIComponent for maximum safety when encoding individual values.

A malformed URI contains invalid percent-encoded sequences, like a lone % not followed by two valid hex digits. Our URL encoder decoder catches these and shows an error instead of returning garbled output.

No. This URL encoder runs entirely in your browser using native JavaScript. Nothing is uploaded, logged, or stored on any server — safe for API keys, tokens, and internal URLs.

Yes. The URL encoder handles full Unicode including Chinese characters, emoji, and other multibyte sequences by decoding the UTF-8 percent-encoded bytes they produce.