URL Encoder & Decoder

No. All encoding and decoding happen entirely in your browser and are never sent to or stored on a server.

When a URL's query parameters contain non-ASCII characters, spaces, or special characters, they need to be converted to a form like %20 so browsers and servers interpret them correctly.

This happens when the input isn't valid URL-encoded text, or when a % isn't followed by valid hex digits. Double-check the original value.

encodeURI preserves a URL's overall structure (slashes, colons, etc.) while converting it, whereas encodeURIComponent is meant for a single piece of a URL, like a query parameter value, so it encodes those separator characters too. This tool works the same way as encodeURIComponent.

Yes. Text is first encoded as UTF-8 and then converted to percent-encoding, so any Unicode character — including non-Latin scripts and emoji — is supported.