Invalid characters in SharePoint naming conventions

This article lists the characters that you cannot use in the following names in Microsoft SharePoint:

• Site names
• Folder name
• Server names
• File names

Site names, subsite names, or site group names

• You cannot use the following characters anywhere in a site name, in a subsite name, or in a site or Active Directory group name:-
  • Tilde (~)
  • Number sign (#)
  • Percent (%)
  • Ampersand (&)
  • Asterisk (*)
  • Braces ({ })
  • Backslash (\)
  • Colon (:)
  • Angle brackets ([ ])
  • Question mark (?)
  • Slash (/)
  • Plus sign (+)
  • Pipe (|)
  • Quotation mark (“)
• You cannot start a site name, a subsite name, or a site group name with an underscore (_) character or with the period (.) character.
• When you create a site name, a subsite name, or a site group name, you cannot use strings that were already used to name managed paths.
• You cannot use the period character consecutively in the middle of a site name, a subsite name, or a site group name.
• You cannot use the period character at the end of a site name, a subsite name, or a site group name.

Folder names

• You cannot use the following characters anywhere in a folder name or a server name:
  • Tilde
  • Number sign
  • Percent
  • Ampersand
  • Asterisk
  • Braces
  • Backslash
  • Colon
  • Angle brackets
  • Question mark
  • Slash
  • Pipe
  • Quotation mark
• You cannot use the period character consecutively in the middle of a folder name.
• You cannot use the period character at the end of a folder name.
• You cannot start a folder name with a period character.

File names

• You cannot use the following characters anywhere in a file name:
  • Tilde
  • Number sign
  • Percent
  • Ampersand
  • Asterisk
  • Braces
  • Backslash
  • Colon
  • Angle brackets
  • Question mark
  • Slash
  • Pipe
  • Quotation mark
• You cannot use the period character consecutively in the middle of a file name.
• You cannot use the period character at the end of a file name.
• You cannot start a file name by using the period character.
• In addition, file names and folder names may not end with any of the following strings:
  • .files
  • _files
  • -Dateien
  • _fichiers
  • _bestanden
  • _file
  • _archivos
  • -filer
  • _tiedostot
  • _pliki
  • _soubory
  • _elemei
  • _ficheiros
  • _arquivos
  • _dosyalar
  • _datoteke
  • _fitxers
  • _failid
  • _fails
  • _bylos
  • _fajlovi
  • _fitxategiak