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Non-breaking space

In word processing and digital typesetting, a non-breaking space (" "), also known as a no-break space or non-breakable space (NBSP), is a variant of the space character that prevents an automatic line break (line wrap) at its position.

In certain formats (such as HTML), it also prevents the “collapsing” of multiple consecutive whitespace characters into a single space. The non-breaking space is also known as a hard space or fixed space. In Unicode, the "common" non-breaking space is encoded as Template:Unichar. Other width variations also exist.

Uses and variations

Despite having similar layout and uses with whitespace, it differs in contextual behavior.[1][2]

Non-breaking behavior

Text-processing software typically assumes that an automatic line break may be inserted anywhere a space character occurs; a non-breaking space prevents this from happening (provided the software recognizes the character). For example, if the text "100 km" (according to the style guide) will not quite fit at the end of a line, the software may insert a line break between "100" and "km". To avoid this undesirable behaviour, the editor may choose to use a non-breaking space between "100" and "km". This guarantees that the text "100 km" will not be broken: if it does not fit at the end of a line it is moved in its entirety to the next line.

Non-collapsing behavior

A second common application of non-breaking spaces is in plain text file formats such as SGML, HTML, TeX and LaTeX, which treat sequences of whitespace characters (space, newline, tab, form feed, etc.) as if they were a single character. Such "collapsing" of whitespace allows the author to neatly arrange the source text using line breaks, indentation and other forms of spacing without affecting the final typeset result.[3][4]

In contrast, non-breaking spaces are not merged with neighboring whitespace characters when displayed, and can therefore be used by an author to insert additional visible space in the resulting output. Conversely, indiscriminate use (see the recommended use in style guides), in addition to a normal space, gives extraneous extra space in the output.

Width variation

Other non-breaking variants, defined in Unicode:

  • Template:Unichar. Produces a space somewhat equal to the figures (0–9) characters.
  • Template:Unichar. It was introduced in Unicode 3.0 for Mongolian,[5] to separate a suffix from the word stem without indicating a word boundary. It is also required for punctuation in French (before ":;?!»" and after "«") and Russian (before ""). When used with Mongolian, its width is usually one third of the normal space; in other contexts, its width resembles that of the thin space (U+2009), at least with some fonts.[6]
  • Template:Unichar: encoded in Unicode since version 3.2. The word-joiner does not produce any space, and prohibits a line break at its position.


Format Representation of non-breaking space
Unicode and ISO/IEC 10646 Template:Unichar
Can be encoded in UTF-8 as C2 A0
ISO/IEC 8859 A0
CP1252 (MS Windows default in most countries using Germanic or Romance languages) A0
EBCDIC 41 – RSP, Required Space
CP437, CP850, CP866 FF
HTML (including Wikitext) Character entity reference:  
Numeric character references:   or  
TeX tilde (~)
ASCII Not available

Unicode defines several other non-break space characters. See #Width variation. Encoding remarks:

  • Word joiner, encoded in Unicode 3.2 and above as U+2060, and in HTML as ⁠ or ⁠.
  • The Byte Order Mark, U+FEFF, officially named "Zero Width No-Break Space", can also be used with the same meaning as the word joiner, but in current documents this use is deprecated. See also Zero-width non-breaking space.

Keyboard entry methods

It is rare for national or international standards on keyboard layouts to define an input method for the non-breaking space. An exception is the Finnish multilingual keyboard, accepted as the national standard SFS 5966 in 2008. According to the SFS setting, the non-breaking space can be entered with the key combination AltGr + Space.[7]

Typically, authors of keyboard drivers and application programs (e.g., word processors) have devised their own keyboard shortcuts for the non-breaking space. For example:

System/application Entry method
Microsoft Windows Alt+0+1+6+0 or Alt+2+5+5 (doesn't always work)
Apple Mac OS X Opt+Space
Linux or Unix using X11 Compose, Space, Space
GNU Emacs Ctrl+X 8 Space
Vim Ctrl+K, Space, Space; or Ctrl+K, Shift+N, Shift+S
Dreamweaver, LibreOffice, Microsoft Word, (since 3.0)
Ctrl+ Shift+Space
FrameMaker, LyX, (before 3.0),
Mac Adobe InDesign Opt+ Cmd+X

Apart from this, applications and environments often have methods of entering unicode entities directly via their code point, e.g. via the Alt Numpad input method. (Non-breaking space has codepoint 255 decimal (FF hex) in codepage 437 and codepage 850, and codepoint 160 decimal (A0 hex) in codepage 1252.)

See also


  1. ^ "Justify Just or Just Justify", M. Elyaakoubi and A. Lazrek. Journal of Electronic Publishing, vol. 13, issue 1, 2010. DOI 10.3998/3336451.0013.105.
  2. ^
  3. ^ "Structure", HTML 4.01, W3, 1999-12-24 .
  4. ^ "Text", CSS 2.1, W3 .
  5. ^ ISO/IEC 10646-1:1993/FDAM 29:1999(E)
  6. ^ "Writing Systems and Punctuation" (PDF). The Unicode Standard 7.0. Unicode Inc. 2014. Retrieved 2014-11-02. 
  7. ^ Kotoistus (2006-12-28), Uusi näppäinasettelu [Status of the new keyboard layout] (presentation) (in Finnish and English), CSC – IT Center for Science  . Drafts of the Finnish multilingual keyboard.
nl:Spatie#Harde spatie