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Unicode Encoder
Convert text into Unicode escape sequences for code.
Quick Tool Overview
The Unicode Encoder converts characters into escape sequences in the notation each language actually uses — \uXXXX, \u{XXXX}, \UXXXXXXXX, CSS backslash escapes or U+ documentation form — with the option to escape only what needs it so source stays readable.
- What it does
- Converts characters into Unicode escape sequences
- You give it
- A string destined for source code
- You get back
- Escapes in the notation your language uses
- Best for
- Source files, config and encoding-safe strings
About the Unicode Encoder
Sometimes a character cannot go directly into a source file. The file encoding is uncertain, the build pipeline mangles it, a code review would not show what it is, or the character is invisible and needs to be explicit. Escape sequences solve all four.
This produces them in the notation each language actually uses: \uXXXX for JavaScript and Java, \u{XXXX} for the modern JavaScript form that handles characters above the Basic Multilingual Plane, \UXXXXXXXX for Python, \XXXX for CSS, and U+XXXX for documentation. Only the characters that need escaping can be converted, leaving ASCII readable, which is almost always what makes source code better rather than worse.
Key features of the Unicode Encoder
Five real notations
JavaScript, modern braced JavaScript, Java, Python and CSS, plus the U+ form for documentation.
Non-ASCII only mode
English text stays legible while the characters that need protecting are escaped.
Surrogate pairs handled
Characters above U+FFFF are written correctly as pairs in the four-digit notation.
CSS trailing space
Inserted automatically when the next character is a hex digit, which CSS requires.
Reverses cleanly
Anything produced here is read straight back by the Unicode Decoder.
How to use the Unicode Encoder
-
1
Paste your text
The string you need to put into source code.
-
2
Choose the notation
JavaScript, Java, Python, CSS or U+ documentation form.
-
3
Decide what to escape
Everything, or only the characters outside ASCII so the readable text stays readable.
-
4
Copy into your code
The output is valid for the language you selected.
Frequently asked questions
The four-digit form only reaches U+FFFF, so a character above that needs a surrogate pair — two escapes. The braced form, added in ES2015, takes the full code point directly and is clearer for emoji.
Because in the four-digit JavaScript notation it has to be written as a UTF-16 surrogate pair. Switch to the braced form or Python notation to get a single escape for the whole code point.
No. Escaping ASCII makes source code unreadable for no benefit. Escaping only non-ASCII gives you a file that is safe under any encoding while the English text stays legible.
A backslash followed by up to six hex digits, used inside content strings. It needs a trailing space when the next character is a hex digit, which the tool inserts automatically.
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