What is a Unicode escape sequence?

A Unicode escape sequence represents a character as \uXXXX where XXXX is the four-digit hexadecimal code point. For example, the capital letter A is \u0041 and the copyright symbol is \u00A9. Characters above U+FFFF use two surrogate pairs in UTF-16.

Why do emoji produce two escape sequences?

Emoji and other characters above U+FFFF are outside the Basic Multilingual Plane. In JavaScript (UTF-16), they are represented as surrogate pairs — two consecutive \uXXXX values. For example, the smiley face (U+1F600) encodes as \uD83D\uDE00.

Is this compatible with JavaScript string literals?

Yes. The encoded output is valid inside JavaScript and JSON string literals. You can paste the sequences directly into JS source code or a JSON value, and the runtime will interpret them as the original characters.

Does the tool handle mixed text and escape sequences?

Yes. During decoding, any \uXXXX or \uXXXX\uXXXX (surrogate pair) sequences found in the input are replaced with their characters, while all other text is passed through unchanged.

Are there any characters that cannot be encoded?

Every valid Unicode character can be encoded. Invalid lone surrogates (unpaired \uD800–\uDFFF) are preserved as-is during decoding rather than producing garbage output.

Is my data sent to a server?

No. All conversion happens entirely in your browser using JavaScript. Nothing is transmitted anywhere.

Unicode Escape Converter

Name: Unicode Escape Converter
Availability: InStock
Author: Nham Vu

Encode any text to \uXXXX Unicode escape sequences or decode them back to readable characters, with support for all Unicode planes including emoji.

Input

Mode: Encode (text → \\uXXXX) Decode (\\uXXXX → text)

Compact (no spaces between sequences) Uppercase hex (\\uXXXX → \\uXXXX)

Quick Examples

Output

Code Point Breakdown

Char	Code Point	Escape	Plane

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Summary