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UTF-8 is a variable-length character encoding standard used for electronic communication1. It is based on the Unicode Standard, which is a universal system for representing characters from different languages and scripts2.
UTF-8 can encode all 1,112,064 valid Unicode code points using one to four bytes (8-bit units) per character1. The first 128 characters of Unicode, which correspond to the ASCII characters, are encoded using a single byte with the same binary value as ASCII1. This means that valid ASCII text is also valid UTF-8-encoded text.
UTF-8 has several advantages over other encodings:
It is backward compatible with ASCII, which is widely used in web protocols, programming languages, and text files1.
It can represent any character in the Unicode standard, which covers most of the world's writing systems2.
It is self-synchronizing, which means that it can recover from errors or data loss by resuming at the next valid code point1.
It is efficient, as it uses fewer bytes for common characters and avoids wasting space with padding or byte order marks3.
UTF-8 is the dominant encoding for the World Wide Web and internet technologies, accounting for 98.1% of all web pages as of 20241. It is also widely supported by modern operating systems, software applications, and standards such as JSON1.
To use UTF-8 encoding in HTML documents, you can specify the charset attribute in the tag:
<meta charset="UTF-8">To use UTF-8 encoding in other text files, such as source code or data files, you can save them with UTF-8 encoding in your text editor or IDE. Alternatively, you can use a byte order mark (BOM) at the beginning of the file to indicate the encoding. However, some applications may not recognize or handle the BOM correctly, so it is generally recommended to avoid using it unless necessary3.
Learn moreâś•This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links. - See moreSee all on Wikipedia
UTF-8 - Wikipedia
UTF-8 is a variable-length character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from Unicode Transformation Format – 8-bit. UTF-8 is capable of encoding all 1,112,064 valid Unicode code points using one to four one-byte (8-bit) code … See more
The official name for the encoding is UTF-8, the spelling used in all Unicode Consortium documents. Most standards officially list it in upper case as well, but all that do are also case … See more
UTF-8 encodes code points in one to four bytes, depending on the value of the code point. In the following table, the x characters are replaced by the bits of the code point:
The first 128 code points (ASCII) need 1 byte. The next … See moreThe International Organization for Standardization (ISO) set out to compose a universal multi-byte character set in 1989. The draft ISO 10646 standard contained a non … See more
Some of the important features of this encoding are as follows:
• Backward compatibility: Backward compatibility with … See moreUTF-8 has been the most common encoding for the World Wide Web since 2008. As of May 2024 , UTF-8 is used by 98.2% of surveyed web sites. Although many pages only use ASCII characters to display content, very few websites now declare their … See more
The following implementations show slight differences from the UTF-8 specification. They are incompatible with the UTF-8 specification and … See more
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