URL Encoder & Decoder

Encode a component

Enter the component text, then choose Encode to run encodeURIComponent behavior.

Decode a component

Enter percent-encoded text, then choose Decode to run decodeURIComponent behavior.

Copy and Clear

Copy copies only the current output. Clear resets the current input and output.

Query-style text example

Input: name=hello world&city=New York

Encoded output: name%3Dhello%20world%26city%3DNew%20York

Unicode example

Input: café

Encoded output: caf%C3%A9

URL components, not full URLs

Percent encoding represents a byte with % and two hexadecimal digits. This tool handles a component such as a query parameter value or path segment; it does not parse/build URLs or provide encodeURI's complete-URL behavior.

Spaces and plus signs

This tool follows encodeURIComponent and decodeURIComponent, not application/x-www-form-urlencoded. Encode writes a space as %20. Decode turns %20 back into a space but leaves a raw + as +; it never treats + as a space.

Unicode and UTF-8 bytes

Valid Unicode round-trips through escapes for its UTF-8 bytes. This tool does not call percent encoding encryption, protection, compression, or complete-URL transformation.

Malformed percent escapes

%ZZ errors because Z is not a hexadecimal digit, so the percent escape is malformed.

Incomplete or invalid UTF-8

%E0%A4 contains percent-encoded bytes but is an incomplete UTF-8 sequence, so decoding errors instead of returning partial/replacement text.

Browser-dependent limits

Input capacity depends on browser/device; no fixed maximum is promised, and very large pasted text can be slow or fail. This tool does not imply file/upload support.