UTF-8

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}}</ref> The Internet Mail Consortium (IMC) recommends that all e-mail programs be able to display and create mail using UTF-8. UTF-8 is also increasingly being used as the default character encoding in operating systems, programming languages, APIs, and software applications.

UTF-8 encodes each of the 1,112,064 code points in the Unicode character set using one to four 8-bit bytes (a group of 8 bits is known as an "octet" in the Unicode Standard). Code points with lower numerical values (i.e. earlier code positions in the Unicode character set, which tend to occur more frequently) are encoded using fewer bytes. The first 128 characters of Unicode, which correspond one-to-one with ASCII, are encoded using a single octet with the same binary value as ASCII, making valid ASCII text valid UTF-8-encoded Unicode as well.

The official IANA code for the UTF-8 character encoding is UTF-8.

History

By early 1992 the search was on for a good byte-stream encoding of multi-byte character sets. The draft ISO 10646 standard contained a non-required annex called UTF-1 that provided a byte-stream encoding of its 32-bit code points. This encoding was not satisfactory on performance grounds, but did introduce the notion that bytes in the range of 0–127 continue representing the ASCII characters in UTF, thereby providing backward compatibility with ASCII.

In July 1992, the X/Open committee XoJIG was looking for a better encoding. Dave Prosser of Unix System Laboratories submitted a proposal for one that had faster implementation characteristics and introduced the improvement that 7-bit ASCII characters would only represent themselves; all multibyte sequences would include only bytes where the high bit was set. This original proposal, FSS-UTF (File System Safe UCS Transformation Format), was similar in concept to UTF-8, but lacked the crucial property of self-synchronization.

In August 1992, this proposal was circulated by an IBM X/Open representative to interested parties. Ken Thompson of the Plan 9 operating system group at Bell Labs then made a small but crucial modification to the encoding, making it very slightly less bit-efficient than the previous proposal but allowing it to be self-synchronizing, meaning that it was no longer necessary to read from the beginning of the string to find code point boundaries. Thompson's design was outlined on September 2, 1992, on a placemat in a New Jersey diner with Rob Pike. In the following days, Pike and Thompson implemented it and updated Plan 9 to use it throughout, and then communicated their success back to X/Open.

UTF-8 was first officially presented at the USENIX conference in San Diego, from January 25 to 29, 1993.

In November 2003 UTF-8 was restricted by RFC 3629 to four bytes to match the constraints of the UTF-16 character encoding.

Google reported that in 2008 UTF-8 (misleadingly labelled "Unicode") became the most common encoding for HTML files.

Description

The design of UTF-8 can be seen in this table of the scheme as originally proposed by Dave Prosser and subsequently modified by Ken Thompson (the x characters are replaced by the bits of the code point):

Bits of code point	First code point	Last code point	Bytes in sequence	Byte 1	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6
7	U+0000	U+007F	1	0xxxxxxx
11	U+0080	U+07FF	2	110xxxxx	10xxxxxx
16	U+0800	U+FFFF	3	1110xxxx	10xxxxxx	10xxxxxx
21	U+10000	U+1FFFFF	4	11110xxx	10xxxxxx	10xxxxxx	10xxxxxx
26	U+200000	U+3FFFFFF	5	111110xx	10xxxxxx	10xxxxxx	10xxxxxx	10xxxxxx
31	U+4000000	U+7FFFFFFF	6	1111110x	10xxxxxx	10xxxxxx	10xxxxxx	10xxxxxx	10xxxxxx

The original specification covered numbers up to 31 bits (the original limit of the Universal Character Set). In November 2003 UTF-8 was restricted by RFC 3629 to end at U+10FFFF, in order to match the constraints of the UTF-16 character encoding. This removed all 5- and 6-byte sequences, and about half of the 4-byte sequences.

The salient features of this scheme are as follows:

1. One-byte codes are used only for the ASCII values 0 through 127. In this case the UTF-8 code has the same value as the ASCII code. The high-order bit of these codes is always 0.
2. Code points larger than 127 are represented by multi-byte sequences, composed of a leading byte and one or more continuation bytes. The leading byte has two or more high-order 1s followed by a 0, while continuation bytes all have '10' in the high-order position.
3. The number of high-order 1s in the leading byte of a multi-byte sequence indicates the number of bytes in the sequence, so that the length of the sequence can be determined without examining the continuation bytes.
4. The remaining bits of the encoding are used for the bits of the code point being encoded, padded with high-order 0s if necessary. The high-order bits go in the lead byte, lower-order bits in succeeding continuation bytes. The number of bytes in the encoding is the minimum required to hold all the significant bits of the code point.
5. Single bytes, leading bytes, and continuation bytes do not share values. This makes the scheme self-synchronizing, allowing the start of a character to be found by backing up at most five bytes (three bytes in actual UTF‑8 as explained below).

The first 128 characters (US-ASCII) need one byte. The next 1,920 characters need two bytes to encode. This covers the remainder of almost all Latin alphabets, and also Greek, Cyrillic, Coptic, Armenian, Hebrew, Arabic, Syriac and Tāna alphabets, as well as Combining Diacritical Marks. Three bytes are needed for characters in the rest of the Basic Multilingual Plane (which contains virtually all characters in common use). Four bytes are needed for characters in the other planes of Unicode, which include less common CJK characters and various historic scripts and mathematical symbols.

Examples

Let us consider how to encode the Euro sign, €.

1. The Unicode code point for "€" is U+20AC.
2. According to the scheme table above, this will take three bytes to encode, since it is between U+0800 and U+FFFF.
3. Hexadecimal 20AC is binary 0010000010101100. The two leading zeros are added because, as the scheme table shows, a three-byte encoding needs exactly sixteen bits from the code point.
4. Because it is a three-byte encoding, the leading byte starts with three 1s, then a 0 (1110...)
5. The remaining bits of this byte are taken from the code point (11100010), leaving ...000010101100.
6. Each of the continuation bytes starts with 10 and takes six bits of the code point (so 10000010, then 10101100).

The three bytes 11100010 10000010 10101100 can be more concisely written in hexadecimal, as E2 82 AC.

The following table summarises this conversion, as well as others with different lengths in UTF-8. The colors indicate how bits from the code point are distributed among the UTF-8 bytes. Additional bits added by the UTF-8 encoding process are shown in black.

Character		Binary code point	Binary UTF-8	Hexadecimal UTF-8
$	U+0024	0100100	00100100	24
¢	U+00A2	000 10100010	11000010 10100010	C2 A2
€	U+20AC	00100000 10101100	11100010 10000010 10101100	E2 82 AC
𤭢	U+24B62	00010 01001011 01100010	11110000 10100100 10101101 10100010	F0 A4 AD A2

Codepage layout

UTF-8

	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_	Template:Chset-color-ctrl|NUL 0000 0	Template:Chset-color-ctrl|SOH 0001 1	Template:Chset-color-ctrl|STX 0002 2	Template:Chset-color-ctrl|ETX 0003 3	Template:Chset-color-ctrl|EOT 0004 4	Template:Chset-color-ctrl|ENQ 0005 5	Template:Chset-color-ctrl|ACK 0006 6	Template:Chset-color-ctrl|BEL 0007 7	Template:Chset-color-ctrl|BS 0008 8	Template:Chset-color-ctrl|HT 0009 9	Template:Chset-color-ctrl|LF 000A 10	Template:Chset-color-ctrl|VT 000B 11	Template:Chset-color-ctrl|FF 000C 12	Template:Chset-color-ctrl|CR 000D 13	Template:Chset-color-ctrl|SO 000E 14	Template:Chset-color-ctrl|SI 000F 15
1_	Template:Chset-color-ctrl|DLE 0010 16	Template:Chset-color-ctrl|DC1 0011 17	Template:Chset-color-ctrl|DC2 0012 18	Template:Chset-color-ctrl|DC3 0013 19	Template:Chset-color-ctrl|DC4 0014 20	Template:Chset-color-ctrl|NAK 0015 21	Template:Chset-color-ctrl|SYN 0016 22	Template:Chset-color-ctrl|ETB 0017 23	Template:Chset-color-ctrl|CAN 0018 24	Template:Chset-color-ctrl|EM 0019 25	Template:Chset-color-ctrl|SUB 001A 26	Template:Chset-color-ctrl|ESC 001B 27	Template:Chset-color-ctrl|FS 001C 28	Template:Chset-color-ctrl|GS 001D 29	Template:Chset-color-ctrl|RS 001E 30	Template:Chset-color-ctrl|US 001F 31
2_	Template:Chset-color-punct|SP 0020 32	Template:Chset-color-punct|! 0021 33	Template:Chset-color-punct|" 0022 34	Template:Chset-color-punct|# 0023 35	Template:Chset-color-punct|$ 0024 36	Template:Chset-color-punct|% 0025 37	Template:Chset-color-punct|& 0026 38	Template:Chset-color-punct|' 0027 39	Template:Chset-color-punct|( 0028 40	Template:Chset-color-punct|) 0029 41	Template:Chset-color-punct|* 002A 42	Template:Chset-color-punct|+ 002B 43	Template:Chset-color-punct|, 002C 44	Template:Chset-color-punct|- 002D 45	Template:Chset-color-punct|. 002E 46	Template:Chset-color-punct|/ 002F 47
3_	Template:Chset-color-digit|0 0030 48	Template:Chset-color-digit|1 0031 49	Template:Chset-color-digit|2 0032 50	Template:Chset-color-digit|3 0033 51	Template:Chset-color-digit|4 0034 52	Template:Chset-color-digit|5 0035 53	Template:Chset-color-digit|6 0036 54	Template:Chset-color-digit|7 0037 55	Template:Chset-color-digit|8 0038 56	Template:Chset-color-digit|9 0039 57	Template:Chset-color-punct|: 003A 58	Template:Chset-color-punct|; 003B 59	Template:Chset-color-punct|< 003C 60	Template:Chset-color-punct|= 003D 61	Template:Chset-color-punct|> 003E 62	Template:Chset-color-punct|? 003F 63
4_	Template:Chset-color-punct|@ 0040 64	Template:Chset-color-alpha|A 0041 65	Template:Chset-color-alpha|B 0042 66	Template:Chset-color-alpha|C 0043 67	Template:Chset-color-alpha|D 0044 68	Template:Chset-color-alpha|E 0045 69	Template:Chset-color-alpha|F 0046 70	Template:Chset-color-alpha|G 0047 71	Template:Chset-color-alpha|H 0048 72	Template:Chset-color-alpha|I 0049 73	Template:Chset-color-alpha|J 004A 74	Template:Chset-color-alpha|K 004B 75	Template:Chset-color-alpha|L 004C 76	Template:Chset-color-alpha|M 004D 77	Template:Chset-color-alpha|N 004E 78	Template:Chset-color-alpha|O 004F 79
5_	Template:Chset-color-alpha|P 0050 80	Template:Chset-color-alpha|Q 0051 81	Template:Chset-color-alpha|R 0052 82	Template:Chset-color-alpha|S 0053 83	Template:Chset-color-alpha|T 0054 84	Template:Chset-color-alpha|U 0055 85	Template:Chset-color-alpha|V 0056 86	Template:Chset-color-alpha|W 0057 87	Template:Chset-color-alpha|X 0058 88	Template:Chset-color-alpha|Y 0059 89	Template:Chset-color-alpha|Z 005A 90	Template:Chset-color-punct|[ 005B 91	Template:Chset-color-punct|\ 005C 92	Template:Chset-color-punct|] 005D 93	Template:Chset-color-punct|^ 005E 94	Template:Chset-color-punct|_ 005F 95
6_	Template:Chset-color-punct|` 0060 96	Template:Chset-color-alpha|a 0061 97	Template:Chset-color-alpha|b 0062 98	Template:Chset-color-alpha|c 0063 99	Template:Chset-color-alpha|d 0064 100	Template:Chset-color-alpha|e 0065 101	Template:Chset-color-alpha|f 0066 102	Template:Chset-color-alpha|g 0067 103	Template:Chset-color-alpha|h 0068 104	Template:Chset-color-alpha|i 0069 105	Template:Chset-color-alpha|j 006A 106	Template:Chset-color-alpha|k 006B 107	Template:Chset-color-alpha|l 006C 108	Template:Chset-color-alpha|m 006D 109	Template:Chset-color-alpha|n 006E 110	Template:Chset-color-alpha|o 006F 111
7_	Template:Chset-color-alpha|p 0070 112	Template:Chset-color-alpha|q 0071 113	Template:Chset-color-alpha|r 0072 114	Template:Chset-color-alpha|s 0073 115	Template:Chset-color-alpha|t 0074 116	Template:Chset-color-alpha|u 0075 117	Template:Chset-color-alpha|v 0076 118	Template:Chset-color-alpha|w 0077 119	Template:Chset-color-alpha|x 0078 120	Template:Chset-color-alpha|y 0079 121	Template:Chset-color-alpha|z 007A 122	Template:Chset-color-punct|{ 007B 123	Template:Chset-color-punct|| 007C 124	Template:Chset-color-punct|} 007D 125	Template:Chset-color-punct|~ 007E 126	Template:Chset-color-ctrl |DEL 007F 127
8_	• +00 128	• +01 129	• +02 130	• +03 131	• +04 132	• +05 133	• +06 134	• +07 135	• +08 136	• +09 137	• +0A 138	• +0B 139	• +0C 140	• +0D 141	• +0E 142	• +0F 143
9_	• +10 144	• +11 145	• +12 146	• +13 147	• +14 148	• +15 149	• +16 150	• +17 151	• +18 152	• +19 153	• +1A 154	• +1B 155	• +1C 156	• +1D 157	• +1E 158	• +1F 159
A_	• +20 160	• +21 161	• +22 162	• +23 163	• +24 164	• +25 165	• +26 166	• +27 167	• +28 168	• +29 169	• +2A 170	• +2B 171	• +2C 172	• +2D 173	• +2E 174	• +2F 175
B_	• +30 176	• +31 177	• +32 178	• +33 179	• +34 180	• +35 181	• +36 182	• +37 183	• +38 184	• +39 185	• +3A 186	• +3B 187	• +3C 188	• +3D 189	• +3E 190	• +3F 191
2-byte C_	2-byte inval (0000) 192	2-byte inval (0040) 193	Latin-1 0080 194	Latin-1 00C0 195	Latin Ext-A 0100 196	Latin Ext-A 0140 197	Latin Ext-B 0180 198	Latin Ext-B 01C0 199	Latin Ext-B 0200 200	IPA 0240 201	IPA 0280 202	Spaci Modif 02C0 203	Combi Diacr 0300 204	Combi Diacr 0340 205	Greek 0380 206	Greek 03C0 207
2-byte D_	Cyril 0400 208	Cyril 0440 209	Cyril 0480 210	Cyril 04C0 211	Cyril 0500 212	Armen 0540 213	Hebrew 0580 214	Hebrew 05C0 215	Arabic 0600 216	Arabic 0640 217	Arabic 0680 218	Arabic 06C0 219	Syriac 0700 220	Arabic 0740 221	Thaana 0780 222	N'Ko 07C0 223
3-byte E_	Indic 0800* 224	Misc. 1000 225	Symbol 2000 226	Kana CJK 3000 227	CJK 4000 228	CJK 5000 229	CJK 6000 230	CJK 7000 231	CJK 8000 232	CJK 9000 233	Asian A000 234	Hangul B000 235	Hangul C000 236	Hangul Surr D000 237	Priv Use E000 238	Forms F000 239
4-byte F_	Ancient Sym,CJK 10000* 240	unall 40000 241	unall 80000 242	Tags Priv C0000 243	Priv Use 100000 244	4-byte inval 140000 245	4-byte inval 180000 246	4-byte inval 1C0000 247	5-byte inval 200000* 248	5-byte inval 1000000 249	5-byte inval 2000000 250	5-byte inval 3000000 251	6-byte inval 4000000* 252	6-byte inval 40000000 253	254	255

Legend: Yellow cells are control characters, blue cells are punctuation, purple cells are digits and green cells are ASCII letters.

Orange cells with a large dot are continuation bytes. The hexadecimal number shown after a "+" plus sign is the value of the 6 bits they add.

White cells are the start bytes for a sequence of multiple bytes, the length shown at the left edge of the row. The text shows the Unicode blocks encoded by sequences starting with this byte, and the hexadecimal code point shown in the cell is the lowest character value encoded using that start byte. When a start byte could form both overlong and valid encodings, the lowest non-overlong-encoded code point is shown, marked by an asterisk "*".

Red cells must never appear in a valid UTF-8 sequence. The first two (C0 and C1) could only be used for overlong encoding of basic ASCII characters (i.e., trying to encode a 7-bit ASCII value between 0 and 127 using 2 bytes instead of 1). The remaining red cells indicate start bytes of sequences that could only encode numbers larger than the 0x10FFFF limit of Unicode. The byte 244 (hex 0xF4) could also encode some values greater than 0x10FFFF; such a sequence would also be invalid if the subsequent bytes attempted to encode a value higher than 0x10FFFF.

Overlong encodings

The standard specifies that the correct encoding of a code point use only the minimum number of bytes required to hold the significant bits of the code point. Longer encodings are called overlong and are not valid UTF-8 representations of the code point. This rule maintains a one-to-one correspondence between code points and their valid encodings, so that there is a unique valid encoding for each code point. Allowing multiple encodings would make testing for string equality difficult to define.

In principle, it would be possible to inflate the number of bytes in an encoding by padding the code point with leading 0s. To encode the Euro sign € from the above example in four bytes instead of three, it could be padded with leading 0s until it was 21 bits long—000000010000010101100. The leading byte prefix for a four-byte encoding is 11110, and so the complete, overlong encoding is 11110000 10000010 10000010 10101100 (or F0 82 82 AC in hexadecimal).

Although overlong encodings are forbidden in UTF-8, at least one derivative makes use of the form. Modified UTF-8 requires the Unicode code point U+0000 (the NUL character) to be encoded in the overlong form 11000000 10000000 (hex C0 80), rather than 00000000 (hex 00). This allows the byte 00 to be used as a string terminator.

Invalid byte sequences

Not all sequences of bytes are valid UTF-8. A UTF-8 decoder should be prepared for:

• the red invalid bytes in the above table
• an unexpected continuation byte
• a start byte not followed by enough continuation bytes
• an Overlong Encoding as described above
• A 4-byte sequence (starting with 0xF4) that decodes to a value greater than U+10FFFF

Many earlier decoders would happily try to decode these. Carefully crafted invalid UTF-8 could make them either skip or create ASCII characters such as NUL, slash, or quotes. Invalid UTF-8 has been used to bypass security validations in high profile products including Microsoft's IIS web server and Apache's Tomcat servlet container.

RFC 3629 states "Implementations of the decoding algorithm MUST protect against decoding invalid sequences." The Unicode Standard requires decoders to "...treat any ill-formed code unit sequence as an error condition. This guarantees that it will neither interpret nor emit an ill-formed code unit sequence."

Many UTF-8 decoders throw exceptions on encountering errors. This can turn what would otherwise be harmless errors (producing a message such as "no such file") into a denial of service bug. For instance, Python 3.0 would exit immediately if the command line or environment variables contained invalid UTF-8, so it was impossible for any Python program to detect and recover from such an error.

An increasingly popular option is to detect errors with a separate API, and for converters to translate the first byte to a replacement and continue parsing with the next byte. These error bytes will always have the high bit set. Popular replacements include:

• The replacement character "�" (U+FFFD)
• The invalid Unicode code points U+DC80..U+DCFF where the low 8 bits are the byte's value.
• The Unicode code points U+0080..U+00FF with the same value as the byte, thus interpreting the bytes according to ISO-8859-1.
• The Unicode code point for the character represented by the byte in CP1252. This is similar to using ISO-8859-1, except that some characters in the range 0x80..0x9F are mapped into different Unicode code points. For example, 0x80 becomes the Euro sign, U+20AC.

These replacement algorithms are "lossy": an invalid string is converted to the same sequence of code points that a valid UTF-8 string could have.

Many programs are specified to allow input in one of several encodings, for example UTF-8, UTF-16 or ISO-8859-1. In that case, the software would first check for UTF-8 correctness. If incorrect then it would check if it is UTF-16, and if not interpret it as entirely ISO-8859-1.

Invalid code points

According to the UTF-8 definition (RFC 3629) the high and low surrogate halves used by UTF-16 (U+D800 through U+DFFF) are not legal Unicode values, and their UTF-8 encoding should be treated as an invalid byte sequence.

Whether an actual application should do this is debatable, as it makes it impossible to store invalid UTF-16 (that is, UTF-16 with unpaired surrogate halves) in a UTF-8 string. This is necessary to store unchecked UTF-16 such as Windows filenames as UTF-8. It is also incompatible with CESU encoding (described below).

Official name and variants

The official name is "UTF-8". All letters are upper-case, and the name is hyphenated. This spelling is used in all the Unicode Consortium documents relating to the encoding.

Alternatively, the name "utf-8" may be used by all standards conforming to the Internet Assigned Numbers Authority (IANA) list (which include CSS, HTML, XML, and HTTP headers), as the declaration is case insensitive.

Other descriptions that omit the hyphen or replace it with a space, such as "utf8" or "UTF 8", are not accepted as correct by the governing standards. Despite this, most agents such as browsers can understand them, and so standards intended to describe existing practice (such as HTML5) may effectively require their recognition.

Unofficially, UTF-8-BOM or UTF-8-NOBOM are sometimes used to refer to text files which contain or lack a BOM. In Japan especially, UTF-8 encoding without BOM is sometimes called "UTF-8N".

Derivatives

The following implementations show slight differences from the UTF-8 specification. They are incompatible with the UTF-8 specification.

CESU-8

Main article: CESU-8

Many programs added UTF-8 conversions for UCS-2 data and did not alter this UTF-8 conversion when UCS-2 was replaced with the surrogate-pair using UTF-16. In such programs each half of a UTF-16 surrogate pair is encoded as its own 3-byte UTF-8 encoding, resulting in 6-byte sequences rather than 4 bytes for characters outside the Basic Multilingual Plane. Oracle and MySQL databases use this, as well as Java and Tcl as described below, and probably many Windows programs where the programmers were unaware of the complexities of UTF-16. Although this non-optimal encoding is generally not deliberate, a supposed benefit is that it preserves UTF-16 binary sorting order when CESU-8 is binary sorted.

Modified UTF-8

In Modified UTF-8, the null character (U+0000) is encoded as 0xC0,0x80; this is not valid UTF-8 because it is not the shortest possible representation. Modified UTF-8 strings never contain any actual null bytes but can contain all Unicode code points including U+0000, which allows such strings (with a null byte appended) to be processed by traditional null-terminated string functions.

All known Modified UTF-8 implementations also treat the surrogate pairs as in CESU-8.

In normal usage, the Java programming language supports standard UTF-8 when reading and writing strings through InputStreamReader and OutputStreamWriter. However it uses Modified UTF-8 for object serialization, for the Java Native Interface, and for embedding constant strings in class files. The dex format defined by Dalvik also uses the same modified UTF-8 to represent string values. Tcl also uses the same modified UTF-8 as Java for internal representation of Unicode data, but uses strict CESU-8 for external data.

Extending from 31 bit to 36 bit range

Extending the accepted input pattern from 6 bytes to 7 bytes would allow over 70 billion code points to be encoded; however, this would require an initial byte value of 0xFE to be accepted as a 7-byte sequence indicator (see under Advantages in section "Compared to single-byte encodings").

Byte order mark

Many Windows programs (including Windows Notepad) add the bytes 0xEF, 0xBB, 0xBF at the start of any document saved as UTF-8. This is the UTF-8 encoding of the Unicode byte order mark (BOM), and is commonly referred to as a UTF-8 BOM, even though it is not relevant to byte order. A BOM can also appear if another encoding with a BOM is translated to UTF-8 without stripping it. Software that is not aware of multibyte encodings will display the BOM as three strange characters (e.g. "" in software interpreting the document as ISO 8859-1 or Windows-1252) at the start of the document.

The Unicode Standard neither requires nor recommends the use of the BOM for UTF-8. The presence of the UTF-8 BOM may cause interoperability problems with existing software that could otherwise handle UTF-8; for example:

• Programming language parsers not explicitly designed for UTF-8 can often handle UTF-8 in string constants and comments, but cannot parse the BOM at the start of the file.
• Programs that identify file types by leading characters may fail to identify the file if a BOM is present even if the user of the file could skip the BOM. An example is the Unix shebang syntax. Another example is Internet Explorer which will render pages in standards mode only when it starts with a document type declaration.
• Programs that insert information at the start of a file will break use of the BOM to identify UTF-8 (one example is offline browsers that add the originating URL to the start of the file).

If compatibility with existing programs is not important, the BOM could be used to identify UTF-8 encoding, but such use should not be necessary as UTF-8 can be identified with very high reliability since other encodings are extremely unlikely to contain valid UTF-8 byte sequences.

Advantages and disadvantages

General

Advantages

• The ASCII characters are represented by themselves as single bytes that do not appear anywhere else, which makes UTF-8 work with the majority of existing APIs that take byte strings but only treat a small number of ASCII codes specially. This removes the need to write a new Unicode version of every API, and makes it much easier to convert existing systems to UTF-8 than any other Unicode encoding.
• UTF-8 is the only encoding for XML entities that does not require a BOM or an indication of the encoding.
• UTF-8 and UTF-16 are the standard encodings for Unicode text in HTML documents, with UTF-8 as the preferred and most used encoding.
• UTF-8 strings can be fairly reliably recognized as such by a simple heuristic algorithm. The probability of a random string of bytes which is not pure ASCII being valid UTF-8 is 3.9% for a two-byte sequence, and decreases exponentially for longer sequences. ISO/IEC 8859-1 is even less likely to be mis-recognized as UTF-8: the only non-ASCII characters in it would have to be in sequences starting with either an accented letter or the multiplication symbol and ending with a symbol. This is an advantage that most other encodings do not have, causing errors (mojibake) if the receiving application isn't told and can't guess the correct encoding. Even word-based UTF-16 can be mistaken for byte encodings (like in the "bush hid the facts" bug).
• Sorting a set of UTF-8 encoded strings as strings of unsigned bytes yields the same order as sorting the corresponding Unicode strings lexicographically by codepoint.
• Other byte-based encodings can pass through the same API. This means, however, that the encoding must be identified. Because the other encodings are unlikely to be valid UTF-8, a reliable way to implement this is to assume UTF-8 and switch to a legacy encoding only if several invalid UTF-8 byte sequences are encountered.

Disadvantages

• A UTF-8 parser that is not compliant with current versions of the standard might accept a number of different pseudo-UTF-8 representations and convert them to the same Unicode output. This provides a way for information to leak past validation routines designed to process data in its eight-bit representation.

Compared to single-byte encodings

Advantages

• UTF-8 can encode any Unicode character, avoiding the need to figure out and set a "code page" or otherwise indicate what character set is in use, and allowing output in multiple scripts at the same time. For many scripts there have been more than one single-byte encoding in usage, so even knowing the script was insufficient information to display it correctly.
• The bytes 0xFE and 0xFF do not appear, so a valid UTF-8 stream never matches the UTF-16 byte order mark and thus cannot be confused with it. The absence of 0xFF (0377) also eliminates the need to escape this byte in Telnet (and FTP control connection).

Disadvantages

• UTF-8 encoded text is larger than specialized single-byte encodings except for plain ASCII characters. In the case of scripts which used 8-bit character sets with non-Latin characters encoded in the upper half (such as most Cyrillic and Greek alphabet code pages), characters in UTF-8 will be double the size. For some scripts, such as Thai and Hindi's Devanagari, characters will triple in size. This has caused objections in India and other countries.
• It is possible in UTF-8 (or any other multi-byte encoding) to split or truncate a string in the middle of a character, which may result in an invalid string. This will not happen in correct handling of UTF-8.
• If the code points are all the same size, measurements of a fixed number of them is easy. Due to ASCII-era documentation where "character" is used as a synonym for "byte" this is often considered important. However, by measuring string positions using bytes instead of "characters" most algorithms can be easily and efficiently adapted for UTF-8.
• Some software, such as text editors, will refuse to correctly display or interpret UTF-8 unless the text starts with a Byte Order Mark, and will insert such a mark. This has the effect of making it impossible to use UTF-8 with any older software that can handle ASCII-like encodings but cannot handle the byte order mark. This is considered an incorrect implementation of the text editor, not the older software.

Compared to other multi-byte encodings

Advantages

• UTF-8 uses the codes 0–127 only for the ASCII characters. This means that UTF-8 is an ASCII extension and can with limited change be supported by software that supports an ASCII extension and handles non-ASCII characters as free text.
• UTF-8 can encode any Unicode character. Files in different scripts can be displayed correctly without having to choose the correct code page or font. For instance Chinese and Arabic can be supported (in the same text) without special codes inserted or manual settings to switch the encoding.
• UTF-8 is self-synchronizing: character boundaries are easily identified by scanning for well-defined bit patterns in either direction. If bytes are lost due to error or corruption, one can always locate the beginning of the next valid character and resume processing. Many multi-byte encodings are much harder to resynchronize.
• Any byte oriented string searching algorithm can be used with UTF-8 data, since the sequence of bytes for a character cannot occur anywhere else. Some older variable-length encodings (such as Shift JIS) did not have this property and thus made string-matching algorithms rather complicated. In Shift JIS the end byte of a character and the first byte of the next character could look like another legal character, something that can't happen in UTF-8.
• Efficient to encode using simple bit operations. UTF-8 does not require slower mathematical operations such as multiplication or division (unlike the obsolete UTF-1 encoding).

Disadvantages

• For certain scripts UTF-8 will take more space than an older multi-byte encoding. East Asian scripts generally have two bytes per character in their multi-byte encodings yet take three bytes per character in UTF-8.

Compared to UTF-16

Advantages

• A text byte stream cannot be losslessly converted to UTF-16, due to the possible presence of errors in the byte stream encoding. This causes unexpected and often severe problems attempting to use existing data in a system that uses UTF-16 as an internal encoding. Results are security bugs, DoS if bad encoding throws an exception, and data loss when different byte streams convert to the same UTF-16. Due to the ASCII compatibility and high degree of pattern recognition in UTF-8, random byte streams can be passed losslessly through a system using it, as interpretation can be deferred until display.
• Byte encodings and UTF-8 are represented by byte arrays in programs, and often nothing needs to be done to a function when converting from a byte encoding to UTF-8. UTF-16 is represented by 16-bit word arrays, and converting to UTF-16 while maintaining compatibility with existing programs (such as was done with Windows) requires every API and data structure that takes a string to be duplicated. Invalid encodings make the duplicated APIs not exactly map to each other, often making it impossible to do some action with one of them.
• Characters outside the basic multilingual plane are not a special case. UTF-16 is often mistaken to be the obsolete constant-length UCS-2 encoding, leading to code that works for most text but suddenly fails for non-BMP characters.
• Text encoded in UTF-8 will be smaller than the same text encoded in UTF-16 if there are more code points below U+0080 than in the range U+0800..U+FFFF. This is true of all modern European languages. As HTML markup, Arabic numbers, spaces and line terminators are code points below U+0080, this is often true even for Asian scripts.
• Most communication and storage was designed for a stream of bytes. A UTF-16 string must use a pair of bytes for each code unit:
  • The order of those two bytes becomes an issue and must be specified in the UTF-16 protocol, such as with a byte order mark.
  • If an odd number of bytes is missing from UTF-16, the whole rest of the string will be meaningless text. Any bytes missing from UTF-8 will still allow the text to be recovered accurately starting with the next character after the missing bytes. If any partial character is removed the corruption is always recognizable.

Disadvantages

• Characters U+0800 through U+FFFF use three bytes in UTF-8, but only two in UTF-16. As a result, text in (for example) Chinese, Japanese or Hindi could take more space in UTF-8 if there are more of these characters than there are ASCII characters. This happens for pure text but rarely for HTML documents or documents in XML based formats such as .docx or .odt. For example, both the Japanese UTF-8 and the Hindi Unicode articles on Wikipedia take more space in UTF-16 than in UTF-8.

See also

• Alt code
• Character encodings in HTML
• Comparison of e-mail clients#Features
• Comparison of Unicode encodings
• GB 18030
• Iconv—a standardized API used to convert between different character encodings
• ISO/IEC 8859
• Specials (Unicode block)
• Unicode and e-mail
• Unicode and HTML
• Universal Character Set
• UTF-8 in URIs
• UTF-9 and UTF-18
• UTF-16/UCS-2

External links

There are several current definitions of UTF-8 in various standards documents:

• RFC 3629 / STD 63 (2003), which establishes UTF-8 as a standard Internet protocol element
• The Unicode Standard, Version 6.0, §3.9 D92, §3.10 D95 (2011)
• ISO/IEC 10646:2003 Annex D (2003)

They supersede the definitions given in the following obsolete works:

• ISO/IEC 10646-1:1993 Amendment 2 / Annex R (1996)
• The Unicode Standard, Version 5.0, §3.9 D92, §3.10 D95 (2007)
• The Unicode Standard, Version 4.0, §3.9–§3.10 (2003)
• The Unicode Standard, Version 2.0, Appendix A (1996)
• RFC 2044 (1996)
• RFC 2279 (1998)
• The Unicode Standard, Version 3.0, §2.3 (2000) plus Corrigendum #1 : UTF-8 Shortest Form (2000)
• Unicode Standard Annex #27: Unicode 3.1 (2001)

They are all the same in their general mechanics, with the main differences being on issues such as allowed range of code point values and safe handling of invalid input.

• Original UTF-8 paper (or pdf) for Plan 9 from Bell Labs
• RFC 5198 defines UTF-8 NFC for Network Interchange
• UTF-8 test pages by Andreas Prilop, Jost Gippert and the World Wide Web Consortium
• Unix/Linux: UTF-8/Unicode FAQ, Linux Unicode HOWTO, UTF-8 and Gentoo
• The Unicode/UTF-8-character table displays UTF-8 in a variety of formats (with Unicode and HTML encoding information)
• Characters, Symbols and the Unicode Miracle – Computerphile on YouTube