--- title: UTF-8, Explained Simply | daily.dev description: UTF-8 is a variable-width character encoding system that has become the dominant standard for text on the web. It achieves backward compatibility with ASCII by... canonical: https://daily.dev/posts/utf-8-explained-simply-gpds2rygl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: UTF-8, Explained Simply | daily.dev og:description: UTF-8 is a variable-width character encoding system that has become the dominant standard for text on the web. It achieves backward compatibility with ASCII by... og:url: https://daily.dev/posts/utf-8-explained-simply-gpds2rygl og:image: https://api.daily.dev/og/posts/gpdS2ryGl.png og:image:alt: UTF-8, Explained Simply og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # UTF-8, Explained Simply **[Nic Barker](https://daily.dev/sources/nicbarkeragain)** · 37 min read · 1 upvotes · 0 comments ## Summary UTF-8 is a variable-width character encoding system that has become the dominant standard for text on the web. It achieves backward compatibility with ASCII by using the unused eighth bit to indicate multi-byte sequences, while maintaining self-synchronization through clever bit patterns that distinguish leading bytes from continuation bytes. The encoding can represent over 2 million code points using 1-4 bytes, with the number of leading ones in the first byte indicating the total length. This design allows UTF-8 to efficiently encode ASCII text in single bytes while supporting all Unicode characters, making it both space-efficient and universally compatible. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Nic Barker Explains ASCII, Unicode, And UTF-8](https://daily.dev/posts/nic-barker-explains-ascii-unicode-and-utf-8-qpgici9wo) · Hackaday · 0 upvotes · 0 comments - [Finding the Next Unicode Code Point in Strings: UTF-8 vs. UTF-16](https://daily.dev/posts/finding-the-next-unicode-code-point-in-strings-utf-8-vs-utf-16-ng1ggjuzw) · C\+\+ · 0 upvotes · 0 comments --- Tags: [#computer-science](https://daily.dev/tags/computer-science) [View this post on daily.dev](https://daily.dev/posts/utf-8-explained-simply-gpds2rygl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"UTF-8, Explained Simply","url":"https://daily.dev/posts/utf-8-explained-simply-gpds2rygl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/utf-8-explained-simply-gpds2rygl"},"datePublished":"2025-10-03T01:18:52.612Z","dateModified":"2025-10-03T01:27:12.613Z","description":"UTF-8 is a variable-width character encoding system that has become the dominant standard for text on the web. 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