Edit HTML and CSS in Notepad++
Work with HTML and CSS files, indentation and browser previews.
Quick answer
Open or create `.html` and `.css` files, use the appropriate language mode, and save with UTF-8 encoding.
When to use this feature
Syntax highlighting makes markup, attributes and CSS declarations easier to read.
Step-by-step instructions for Windows users
- Open Notepad++ on Windows 10 or Windows 11 and save a backup of the file you plan to edit.
- Open or create `.html` and `.css` files, use the appropriate language mode, and save with UTF-8 encoding.
- Preview the result in a browser and check the developer console for missing assets or invalid CSS.
- Review the result and save a separate copy before replacing the original file.
Important details and compatibility
Preview the result in a browser and check the developer console for missing assets or invalid CSS.
Menu labels can differ between versions, and plugins may require a compatible build. Check the application settings on your own PC rather than assuming all installations have the same options.
Common mistakes and safety
Never edit a live site's only copy; keep version control or a backup.
If the result differs from what you expected, undo the change, reopen the original copy, and repeat the steps with a smaller sample.
Frequently asked question
Is Notepad++ suitable for HTML?
Yes. It is a lightweight source editor for HTML, CSS and JavaScript.
Does this work in the US and Canada?
These Windows editing features are not region-restricted. The instructions use American English menu terminology and apply to supported Windows PCs in the United States and Canada.
Related Notepad++ resources
See the download guide, Windows 11 instructions, FAQ, and all tutorials.
Editorial team · Published 2026-10-20 · Updated 2026-10-20. This is an instructional guide, not a claim of hands-on testing on every Windows build.