Convert Unicode to String Literal

Historical and syntactic. JavaScript ES2015 added u{XXXXX} for codepoints > U+FFFF. Pre-ES2015 JS only had uXXXX, requiring surrogate pairs for emoji. Python uses UXXXXXXXX (8-digit) for codepoints > U+FFFF. JSON has no support for u{...} at all – must use surrogate pairs. Java always uses surrogate pairs. Go and C have U with 8 hex digits. Each language’s parser only accepts its own variant – using the wrong escape format produces syntax errors.

UTF-16’s way of encoding codepoints above U+FFFF using two 16-bit code units. The high surrogate is in D800-DBFF, the low surrogate in DC00-DFFF. So 🌍 (U+1F30D) becomes 🌍. JSON and Java require this; modern JS/Python/Rust/Go let you write the codepoint directly in u{} or UXXXXXXXX. The tool handles the math for you.

It gets escaped. With double-quote selected, every " in the input becomes ". Switch to single-quote and the input’s ' chars escape instead, leaving " chars unchanged. Pick the quote style your codebase uses to minimize escapes.

On (default): printable ASCII characters (a-z, A-Z, 0-9, common punctuation) stay literal in the output – your string is human-readable. Off: every character becomes an escape sequence – the output is dense but unambiguous about every codepoint. Off mode is useful when transmitting through systems that may modify whitespace or quote characters.

These control characters can’t appear directly inside most language string literals (the literal would end mid-character). Their backslash-escape forms are the standard way to embed them. Some languages allow raw newlines inside multi-line strings, but escape forms work universally.

The reverse direction handles JS/Python/Go/Rust/C-style escapes universally: uXXXX, u{XXX}, UXXXXXXXX, xNN, plus the standard escapes (n t r b f v \ " ' `). Surrogate pairs are auto-combined. Outer quotes are stripped if present.

RFC 8259 (JSON) only specifies uXXXX escapes – no u{...}, no xNN, no v, no . For codepoints above U+FFFF, JSON requires the UTF-16 surrogate pair form (🌍 for 🌍). Common JSON parsing libraries handle this correctly; this tool emits the right form.

Pick backtick as the quote style. The tool escapes ` characters (and the ${ sequence – but you’d need to manually escape that in your code if intentional). Template literal syntax otherwise matches single/double-quote strings for escape sequences.

No. All escaping happens in your browser.

Yes. The whole tool weighs about 18 KB, so once the page has loaded it runs without any network connection – every conversion happens locally in JavaScript on your device.