UTF-16. In UTF-16, a BOM ( U+FEFF ) may be placed as the first character of a file or character stream to indicate the endianness (byte order) of all the 16-bit code unit of the file or stream.

What is UTF with BOM?

The UTF-8 file signature (commonly also called a “BOM”) identifies the encoding format rather than the byte order of the document. UTF-8 is a linear sequence of bytes and not sequence of 2-byte or 4-byte units where the byte order is important. Encoding. Encoded BOM. UTF-8.

Does UTF-16 require BOM?

If there is no BOM, the encoding could be anything. Where a text data stream is known to be plain Unicode text (but not which endian), then BOM can be used as a signature.
Byte Order Mark (BOM) FAQ.

Bytes Encoding Form
FF FE UTF-16, little-endian

What is BOM in character encoding?

A byte order mark (BOM) consists of the character code U+FEFF at the beginning of a data stream, where it can be used as a signature defining the byte order and encoding form, primarily of unmarked plaintext files.

What is UTF-16 used for?

UTF-16 (16- bit Unicode Transformation Format) is a standard method of encoding Unicode character data. Part of the Unicode Standard version 3.0 (and higher-numbered versions), UTF-16 has the capacity to encode all currently defined Unicode characters.

Should I use BOM UTF-8?

The UTF-8 BOM is a sequence of bytes at the start of a text stream ( 0xEF, 0xBB, 0xBF ) that allows the reader to more reliably guess a file as being encoded in UTF-8. Normally, the BOM is used to signal the endianness of an encoding, but since endianness is irrelevant to UTF-8, the BOM is unnecessary.

What does UTF mean?

Unicode Transformation Format

The Unicode Transformation Format (UTF) is a character encoding format which is able to encode all of the possible character code points in Unicode. The most prolific is UTF-8, which is a variable-length encoding and uses 8-bit code units, designed for backwards compatibility with ASCII encoding.

What is BOM in csv file?

The ÿþ character is known as the byte order marking (BOM) character and is commonly found as the first line of a CSV file. ÿþ can not be seen when the CSV is opened with Notepad or Excel for that an Editor is required that can display the BOM (Byte Order Mark).

What is BOM in PHP?

The byte order mark (BOM) is a Unicode character that sometimes causes problems in PHP scripts (especially in includes), because it can cause HTTP headers to be sent to the browser prematurely.

What is BOM XML?

XML > Byte Order Marker. The Byte Order Marker (BOM) is a series of byte values placed on the beginning of an encoded text stream (or file). This data allows the reader to correctly decide which character encoding to use when decoding the stream back into a sequence of characters.

How do I get rid of UTF-8 BOM?


  1. Download Notepad++.
  2. To check if BOM character exists, open the file in Notepad++ and look at the bottom right corner. If it says UTF-8-BOM then the file contains BOM character.
  3. To remove BOM character, go to Encoding and select Encode in UTF-8.
  4. Save the file and re-try the import.

How can I tell if a file is UTF-16?

For your specific use-case, it’s very easy to tell. Just scan the file, if you find any NULL (“\0”), it must be UTF-16. JavaScript got to have ASCII chars and they are represented by a leading 0 in UTF-16.

What is the difference between UTF-8 and UTF-16?

The main difference between UTF-8, UTF-16, and UTF-32 character encoding is how many bytes it requires to represent a character in memory. UTF-8 uses a minimum of one byte, while UTF-16 uses a minimum of 2 bytes.

Should I use UTF-8 or UTF-16?

If your data is mostly in western languages and you want to reduce the amount of storage needed, go with UTF-8 as for those languages it will take about half the storage of UTF-16.

How many UTF-16 characters are there?

The first 16-bit value is encoded in the range from 0xD800 to 0xDBFF. The second 16-bit value is encoded in the range from 0xDC00 to 0xDFFF. With supplementary characters, UTF-16 character codes can represent more than one million characters. Without supplementary characters, only 65,536 characters can be represented.

How many bytes is UTF-16?

Likewise, UTF-16 is based on 16-bit code units. Therefore, each character can be 16 bits (2 bytes) or 32 bits (4 bytes). All UTFs include the full Unicode character repertoire , or set of characters.

Is UTF-16 variable width?

The encoding is variable-length, as code points are encoded with one or two 16-bit code units. UTF-16 arose from an earlier obsolete fixed-width 16-bit encoding, now known as UCS-2 (for 2-byte Universal Character Set), once it became clear that more than 216 (65,536) code points were needed.

Is UTF-16 fixed width?

And yes, UTF-16 and UTF-32 are both fixed width.

Why does javascript use UTF-16?

JS does require UTF-16, because the surrogate pairs of non-BMP characters are separable in JS strings. Any JS implementation using UTF-8 would have to convert to UTF-16 for proper answers to . length and array indexing on strings. Still doesn’t mean that it has to store the strings in UTF-16.

What are UTF-16 characters?

UTF-16 is an encoding of Unicode in which each character is composed of either one or two 16-bit elements. Unicode was originally designed as a pure 16-bit encoding, aimed at representing all modern scripts.

Are JS strings UTF-16?

While a JavaScript source file can have any kind of encoding, JavaScript will then convert it internally to UTF-16 before executing it. JavaScript strings are all UTF-16 sequences, as the ECMAScript standard says: When a String contains actual textual data, each element is considered to be a single UTF-16 code unit.

Are JavaScript strings UTF-16?

The String type is generally used to represent textual data in a running ECMAScript program, in which case each element in the String is treated as a UTF-16 code unit value.

Is JavaScript string Unicode?

In Javascript, the identifiers and string literals can be expressed in Unicode via a Unicode escape sequence. The general syntax is \uXXXX , where X denotes four hexadecimal digits. For example, the letter o is denoted as ‘\u006F’ in Unicode.

What is JavaScript character encoding?

It is a 7-bit fixed-length encoding scheme that uses 7 bits to encode a character. This encoding can only encode characters in the English language and some commonly used symbols like dash (-) and period (.). However, JavaScript engine stores string literals in the UTF-16 encoding format.

What is Unicode with example?

The code point is a unique number for a character or some symbol such as an accent mark or ligature. Unicode supports more than a million code points, which are written with a “U” followed by a plus sign and the number in hex; for example, the word “Hello” is written U+0048 U+0065 U+006C U+006C U+006F (see hex chart).

How many characters can 16-bit Unicode represent?

65,536 characters

Unicode is a universal character set. It is aimed to include all the characters needed for any writing system or language. The first code point positions in Unicode use 16 bits to represent the most commonly used characters in a number of languages. This Basic Multilingual Plane allows for 65,536 characters.

What is the most common Unicode encoding?

The most commonly used encodings are UTF-8, UTF-16, and the obsolete UCS-2 (a precursor of UTF-16 without full support for Unicode); GB18030, while not an official Unicode standard, is standardized in China and implements Unicode fully.