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Windows-1251 is an 8-bit character encoding, designed to cover languages that use the Cyrillic script such as Russian, Ukrainian, Belarusian, Bulgarian, Serbian Cyrillic, Macedonian and other languages.
| MIME / IANA | windows-1251 |
|---|---|
| Alias(es) | cp1251 (Code page 1251) |
| Language(s) | Russian, Ukrainian, Belarusian, Bulgarian, Serbian Cyrillic, Bosnian Cyrillic, Macedonian, Rotokas, Rusyn, English |
| Created by | Microsoft |
| Standard | WHATWG Encoding Standard |
| Classification | extended ASCII, Windows-125x |
| Other related encoding(s) | Amiga-1251, KZ-1048, RFC 1345's "ECMA-Cyrillic" |
On the web, it is the second most-used single-byte character encoding (or third most-used character encoding overall), and most used of the single-byte encodings supporting Cyrillic. As of January 2024[update], 0.3% of all websites use Windows-1251.[1][2] It's by far mostly used for Russian, while a small minority of Russian websites use it, with 94.6% of Russian (.ru) websites using UTF-8,[3][4][5] and the legacy 8-bit encoding is distant second. In Linux, the encoding is known as cp1251.[6] IBM uses code page 1251 (CCSID 1251 and euro sign extended CCSID 5347) for Windows-1251.[7][8][9][10][11][12][13]
Windows-1251 and KOI8-R (or its Ukrainian variant KOI8-U) are much more commonly used than ISO 8859-5 (which is used by less than 0.0004% of websites).[14] In contrast to Windows-1252 and ISO 8859-1, Windows-1251 is not closely related to ISO 8859-5.
Unicode (e.g. UTF-8) is preferred to Windows-1251 or other Cyrillic encodings in modern applications, especially on the Internet, making UTF-8 the dominant encoding for web pages. (For further discussion of Unicode's complete coverage, of 436 Cyrillic letters/code points, including for Old Cyrillic, and how single-byte character encodings, such as Windows-1251 and KOI8-R, cannot provide this, see Cyrillic script in Unicode.)
The following table shows Windows-1251. Each character is shown with its Unicode equivalent and its Alt code.
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |
| 0x | NUL | SOH | STX | ETX | EOT | ENQ | ACK | BEL | BS | HT | LF | VT | FF | CR | SO | SI |
| 1x | DLE | DC1 | DC2 | DC3 | DC4 | NAK | SYN | ETB | CAN | EM | SUB | ESC | FS | GS | RS | US |
| 2x | SP | ! | " | # | $ | % | & | ' | ( | ) | * | + | , | - | . | / |
| 3x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | : | ; | < | = | > | ? |
| 4x | @ | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O |
| 5x | P | Q | R | S | T | U | V | W | X | Y | Z | [ | \ | ] | ^ | _ |
| 6x | ` | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o |
| 7x | p | q | r | s | t | u | v | w | x | y | z | { | | | } | ~ | DEL |
| 8x | Ђ | Ѓ | ‚ | ѓ | „ | … | † | ‡ | € | ‰ | Љ | ‹ | Њ | Ќ | Ћ | Џ |
| 9x | ђ | ‘ | ’ | “ | ” | • | – | — | ™ | љ | › | њ | ќ | ћ | џ | |
| Ax | NBSP | Ў | ў | Ј | ¤ | Ґ | ¦ | § | Ё | © | Є | « | ¬ | SHY | ® | Ї |
| Bx | ° | ± | І | і | ґ | µ | ¶ | · | ё | № | є | » | ј | Ѕ | ѕ | ї |
| Cx | А | Б | В | Г | Д | Е | Ж | З | И | Й | К | Л | М | Н | О | П |
| Dx | Р | С | Т | У | Ф | Х | Ц | Ч | Ш | Щ | Ъ | Ы | Ь | Э | Ю | Я |
| Ex | а | б | в | г | д | е | ж | з | и | й | к | л | м | н | о | п |
| Fx | р | с | т | у | ф | х | ц | ч | ш | щ | ъ | ы | ь | э | ю | я |
An altered version of Windows-1251 was standardised in Kazakhstan as Kazakh standard STRK1048, and is known by the label KZ-1048. It differs in the rows shown below:
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |
| 8x | Ђ | Ѓ | ‚ | ѓ | „ | … | † | ‡ | € | ‰ | Љ | ‹ | Њ | Қ | Һ | Џ |
| 9x | ђ | ‘ | ’ | “ | ” | • | – | — | ™ | љ | › | њ | қ | һ | џ | |
| Ax | NBSP | Ұ | ұ | Ә | ¤ | Ө | ¦ | § | Ё | © | Ғ | « | ¬ | SHY | ® | Ү |
| Bx | ° | ± | І | і | ө | µ | ¶ | · | ё | № | ғ | » | ә | Ң | ң | ү |
Differences from Windows-1251
Code Page 1174 is another variant created for the Kazakh language, which matches Windows-1251 for the Russian subset of the Cyrillic letters. It differs from KZ-1048 by moving the Cyrillic letter Shha from 8E/9E to 8A/9A.
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |
| 8x | Ђ | Ѓ | ‚ | ѓ | „ | … | † | ‡ | € | ‰ | Һ | ‹ | Њ | Қ | Ћ | Џ |
| 9x | ђ | ‘ | ’ | “ | ” | • | – | — | ™ | һ | › | њ | қ | ћ | џ | |
| Ax | NBSP | Ұ | ұ | Ә | ¤ | Ө | ¦ | § | Ё | © | Ғ | « | ¬ | SHY | ® | Ү |
| Bx | ° | ± | І | і | ө | µ | ¶ | · | ё | № | ғ | » | ә | Ң | ң | ү |
Different from Windows-1251
| MIME / IANA | Amiga-1251 |
|---|---|
| Alias(es) | Ami1251 |
| Language(s) | English, Russian |
| Classification | extended ASCII |
| Based on | Windows-1251, ISO-8859-1, ISO-8859-15 |
Russian Amiga OS systems used a version of code page 1251 which matches Windows-1251 for the Russian subset of the Cyrillic letters, but otherwise mostly follows ISO-8859-1. This version is known as Amiga-1251,[18] under which name it is registered with the IANA.[19]
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |
| 8x | XXX | XXX | BPH | NBH | IND | NEL | SSA | ESA | HTS | HTJ | VTS | PLD | PLU | RI | SS2 | SS3 |
| 9x | DCS | PU1 | PU2 | STS | CCH | MW | SPA | EPA | SOS | XXX | SCI | CSI | ST | OSC | PM | APC |
| Ax | NBSP | ¡ | ¢ | £ | €[a] | ¥ | ¦ | § | Ё | © | №[b] | « | ¬ | SHY | ® | ¯ |
| Bx | ° | ± | ² | ³ | ´ | µ | ¶ | · | ё | ¹ | º | » | ¼ | ½ | ¾ | ¿ |
Different from Windows-1251 to match ISO-8859-1
Different from both Windows-1251 and ISO-8859-1
- Matching ISO-8859-15; at a different location than in Windows-1251
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