U+FEFF

Zero width no-break space

Zero width no-break space is a monochrome text character from the Unicode Arabic Presentation Forms-B block, listed here under Invisible & Spacing. Copy it with one click, or use the hex, octal, decimal and HTML entity codes below to embed it in web pages, code, and documents. It is often searched for as "invisible", "byte", "order", "mark".

Quick facts

Unicode
U+FEFF
Decimal
65279
Hex
0xFEFF
Octal
0o177377

Unicode identity

FormatValueCopy
Code pointOfficial Unicode notationU+FEFF
Official nameUnicodeData.txt, Unicode 18.0.0ZERO WIDTH NO-BREAK SPACE
Unicode 1.0 nameLegacy aliasBYTE ORDER MARK
DecimalBase 1065279
HexadecimalBase 160xFEFF
OctalBase 80o177377
BinaryBase 21111111011111111
General categoryOther, formatCf
Unicode blockU+FE70–U+FEFFArabic Presentation Forms-B
PlaneBasic Multilingual Plane (BMP, Plane 0)

HTML & CSS

FormatValueCopy
HTML entity (decimal)
HTML entity (hex)
CSS content escapeUse inside content: "…"\FEFF
URL encodedPercent-encoded UTF-8%EF%BB%BF

Programming languages

FormatValueCopy
JavaScript / TypeScript\uFEFF
JSONUTF-16 surrogate pairs\uFEFF
Python\uFEFF
Java / C# / Kotlin\uFEFF

Byte encodings

FormatValueCopy
UTF-83 bytesEF BB BF
UTF-16 (BE)FEFF
UTF-32 (BE)0000FEFF

How to type Zero width no-break space

  • Windows

    Hold Alt and type +FEFF with the hex numeric keypad option enabled, or type FEFF then press Alt+X in Word and most Office apps.

  • macOS

    Enable the Unicode Hex Input keyboard, hold Option, and type FEFF. Or open Character Viewer (Control+Command+Space) and search "Zero width no-break space".

  • Linux

    Press Ctrl+Shift+U, type feff, then press Space or Enter in GTK apps. IBus and most terminals support the same sequence.

  • HTML, CSS & code

    Paste the character directly, or use the escapes above:  in HTML, \FEFF in CSS, and \uFEFF in JavaScript.

Official Unicode reference

Character name
ZERO WIDTH NO-BREAK SPACE
Unicode 1.0 name
BYTE ORDER MARK
Block
Arabic Presentation Forms-B (U+FE70–U+FEFF)
General category
Cf — Other, format

Data from the Unicode Character Database, version 18.0.0. See the official code chart for the Arabic Presentation Forms-B block: UFE70.pdf (PDF, unicode.org).

Frequently asked questions

How do I copy the Zero width no-break space symbol?

Click the Copy button at the top of this page, or select Zero width no-break space and press Ctrl+C (Cmd+C on Mac). It is plain Unicode text, so it pastes into documents, chats, code, and design tools.

What is the Unicode code point for Zero width no-break space?

Zero width no-break space is U+FEFF (decimal 65279, hexadecimal 0xFEFF, octal 0o177377). It lives in the Arabic Presentation Forms-B block (U+FE70–U+FEFF) of the Basic Multilingual Plane (BMP, Plane 0).

What is the official Unicode name of Zero width no-break space?

The Unicode Standard (version 18.0.0) names this character "ZERO WIDTH NO-BREAK SPACE"; its Unicode 1.0 name was "BYTE ORDER MARK". Its General_Category is Cf (Other, format).

What is the HTML code for Zero width no-break space?

Use  or . In CSS, use content: "\FEFF".

How do I type Zero width no-break space in code?

JavaScript: "\uFEFF". Python: "\uFEFF". JSON and Java: "\uFEFF". The UTF-8 byte sequence is EF BB BF.

Is Zero width no-break space an emoji?

No. Zero width no-break space is a text symbol and renders as a monochrome glyph in the current font. Some platforms may offer an emoji variant when U+FE0F is appended.

Related symbols in Invisible & Spacing

View all invisible & spacing