HTM File Format | .htm Extension Last Updated : 20 Nov, 2024 Comments Improve Suggest changes Like Article Like Report The HTM file format is a web page file written in Hypertext Markup Language (HTML) and uses the .htm extension, which is an alternative to .html. Early operating systems restricted file extensions to three characters, making .htm a common choice, especially in legacy systems.An HTM file is a plain text file containing HTML code that defines the structure and layout of a webpage. It serves as a blueprint for how browsers display the content, including text, images, multimedia, and hyperlinks. It serves the exact same purpose as an HTML file.Features of HTM FilesText-Based Format: HTM files are simple text files and can be edited with any text or code editor.Browser Compatibility: Supported by all major web browsers such as Google Chrome, Mozilla Firefox, Safari, and Microsoft Edge.Flexible Usage: Used for static web pages or as a component of dynamic web applications when combined with other technologies like JavaScript.History of .htm ExtensionThe .htm extension originated in the early days of computing when operating systems like DOS limited file extensions to three characters. This restriction led to the adoption of .htm as an alternative to .html. Today, modern systems no longer impose this limitation, making .html more widely used. However, .htm extension is still functional and fully supported.Create and Run .htm fileStep 1: Create a .htm extension file.You can create a file with .htm extension as similar to .htmlStep 2: Open the fileYou can choose any code editor like VS Code, Sublime Text etc to open the file and to write code. HTML <html> <head> <style> body { font-family: Arial, sans-serif; background-color: #f0f0f0; margin: 0; padding: 0; } h2 { color: green; padding: 10px; text-align: center; } div { max-width: 500px; box-shadow: 0px 0px 10px 0px grey; padding: 30px; border-radius: 10px; margin: 5rem; } p { margin: 20px; font-size: 18px; } </style> </head> <body> <div> <h2>Welcome To Geeksforgeeks!!</h2> <p> A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles. </p> </div> </body> </html> Step 3: Run the fileDouble click the index.htm file and your preferred web browser will open and present the content of that page correctly.HTM File Format Another option is to enter the URL of a .HTM online file in the address bar of your web browser and access the internet web page.Difference between .htm and .htmlFeature.htm.htmlOriginUsed in early systems with a 3-character file extension limit (e.g., DOS).Became common with modern operating systems that support longer file extensions.Length3 characters (.htm)4 characters (.html)Default Server BehaviorMay not always be recognized as the default index file (e.g, index.htm)Commonly recognized as the default index file (e.g., index.html).Modern UsageLess frequently used in modern web development.Widely used and preferred for modern web development.CompatibilityFully supported by all browsers and servers.Fully supported by all browsers and servers.PreferenceOften used in legacy systems or for backward compatibility.The standard choice for web development today.File Size ImpactSlightly smaller extension but negligible difference overall.Slightly longer extension, commonly used for clarity. Comment More infoAdvertise with us Next Article HTML File Format | .html Extension saurabhkumarsharma05 Follow Improve Article Tags : HTML Web Format Similar Reads List of File Formats with Types and Extensions File Formats store a large variety of raw information in a structured format so that the data can be easily stored, processed, and harnessed. A file format is a standard way of storing data on a computer file. There are multiple types of file formats present which can be used to store and retrieve d 8 min read Text File FormatsText File FormatsTXT file format is a format that is developed for storing plain text with no formatting such as graphics, bolding, italicization, font style, alignment, and so on. It is one of the most basic file types and the most widely used file formats on computers. 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