HTML

HTML is the markup language that defines the structure and meaning of web content. Created by Tim Berners-Lee in 1991 and formalized into a standard by the W3C, it uses a system of nested tags to describe headings, paragraphs, links, images, and interactive elements. Modern browsers render HTML alongside CSS and JavaScript, but an HTML file on its own is a valid, self-contained document that any browser can display.

File extensions	.html, .htm
MIME type	text/html
Developer	W3C / WHATWG
First released	1993
Category	Documents
Open standard	Yes

What opens HTML files

• All modern web browsers
• Visual Studio Code
• Dreamweaver
• Notepad / TextEdit

Browse File Formats

Reference details for 53 file formats — extensions, MIME types, what opens each one, and how they convert.

7Z Archives ABW Documents AI Images AVIF Images AZW3 E-books BMP Images CSS Other CSV Spreadsheets DjVu E-books DOC Documents DOCX Documents EPS Images EPUB E-books FB2 E-books GIF Images GZ Archives HEIC Images HTML Documents ICO Images ISO Archives JPG Images JSON Other Keynote Presentations Markdown Documents MOBI E-books Numbers Spreadsheets ODP Presentations ODS Spreadsheets ODT Documents OTF Other Pages Documents PDF Documents PNG Images PPT Presentations PPTX Presentations PSD Images RAR Archives RAW Images RTF Documents SVG Images TAR Archives TeX / LaTeX Documents TIFF Images TSV Spreadsheets TTF Other TXT Documents WebP Images WOFF / WOFF2 Other WPD Documents XLS Spreadsheets XLSX Spreadsheets XML Documents ZIP Archives