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U+00EF · Latin-1 Supplement

Latin Small Letter I with Diaeresis ï

Small i with diaeresis signals that the i is pronounced as a separate vowel. It is used in French ('naïf', 'maïs'), Dutch ('geïnteresseerd'), Catalan, and Afrikaans, and in English words like 'naïve' when writers keep the older spelling. It also appears in names such as 'Zaïre' and 'Moïse'.

WindowsAlt 139 / 0239
MacOption + U, then I
UnicodeU+00EF
HTMLï
ïU+00EF

Character codes

Unicode code pointU+00EF
Decimal239
HTML named entityï
HTML (hex)ï
HTML (decimal)ï
CSS\00EF
JavaScript\u00EF
Python\u00EF
UTF-8 bytesC3 AF
UTF-1600EF
URL-encoded%C3%AF

Character details

Official nameLATIN SMALL LETTER I WITH DIAERESIS
Unicode blockLatin-1 Supplement
General categoryLowercase Letter (Ll)
SymbolHero categoryAccented Letters
DecompositionU+0069 U+0308
UppercaseÏ Latin Capital Letter I with Diaeresis
EmojiNo

How to type ï

Windows

  • Hold Alt and type 139 on the numeric keypad (Num Lock on), then release Alt. Alt 139 uses the code page 437.
  • Hold Alt and type 0239 on the numeric keypad (Num Lock on), then release Alt. Alt 0239 uses the Windows-1252 code page.
  • In Microsoft Word or Outlook: type 00EF then press Alt + X.
  • Open Character Map (search “Character Map” in Start), tick “Advanced view”, search for “latin small letter i with diaeresis”, then Select and Copy.

Mac

  • Press Option + U, then I (US English keyboard layout).
  • Press Control + Command + Space to open the Character Viewer, search “latin small letter i with diaeresis”, and double-click the result.
  • With the Unicode Hex Input keyboard enabled (System Settings → Keyboard → Input Sources), hold Option and type 00EF.

iPhone & Android

  • On iPhone and most Android keyboards, press and hold the i key and slide to ï. On a Mac, holding the key down works the same way.
  • Tap Copy at the top of this page, then long-press where you want it and choose Paste.

Docs & web

  • Google Docs: Insert → Special characters, then search “latin small letter i with diaeresis” or enter U+00EF.
  • HTML: ï or ï
  • Excel / Google Sheets: =UNICHAR(239)

Examples

  • naïve
  • maïs
  • Moïse
  • geïnteresseerd

Good to know

Don’t mix it up: Often confused with ї (U+0457), the Ukrainian Cyrillic letter yi, which looks the same but belongs to a different script.

Tip: In English, 'naive' without the diaeresis is now standard; 'naïve' is a stylistic choice.

Display: the character itself is always the same code point, but its shape comes from the font on the device showing it. If you see an empty box, the font lacks this glyph—the text is still correct.

Guides

How to Type French Accents (é è ê ç à ù ô œ)

Similar accented letters

Latin Small Letter a with Tilde
a with Umlaut (ä)
Latin Small Letter a with Ring Above
Latin Small Letter Ae
c with Cedilla (ç)
e with Grave (è)
e with Acute (é)
e with Circumflex (ê)
Latin Small Letter E with Diaeresis
Latin Small Letter I with Grave
i with Acute (í)
Latin Small Letter I with Circumflex
Latin Small Letter Eth
n with Tilde (ñ)
Latin Small Letter O with Grave
o with Acute (ó)
Latin Small Letter O with Circumflex
Latin Small Letter O with Tilde
o with Umlaut (ö)
Latin Small Letter O with Stroke
Latin Small Letter U with Grave
u with Acute (ú)
Latin Small Letter U with Circumflex
u with Umlaut (ü)

See all 656 accented letters →

Questions

What is the Unicode for ï?

It is U+00EF (LATIN SMALL LETTER I WITH DIAERESIS), decimal 239.

Is there a Windows Alt code for it?

Yes: Alt 139 or Alt 0239 on the numeric keypad.

How do I type it on a Mac?

Option + U, then I on a US English keyboard, or use the Character Viewer (Control + Command + Space).

What is the HTML code?

Use the named entity ï or the numeric reference ï.