Code Highlighter
Highlight code snippets in multiple languages with customizable themes, wrap mode, and line numbers.
Preview
JavaScriptOnline Code Highlighter & Syntax Highlighting Tool - Paste or write code to preview instant syntax highlighting with a clean, professional layout. This code formatter helps developers, technical writers, and educators produce readable code snippets for documentation, tutorials, README files, and presentations. Customize the look with themes, control layout with line numbers and line wrapping, and quickly copy the highlighted output for reuse.
Introduction
The Code Highlighter is a browser-based syntax highlight tool that turns raw source code into clear, structured code blocks. It is ideal for sharing examples, explaining logic, and creating polished code visuals without opening a full IDE. Use it as a fast, lightweight formatter to make snippets easier to read and easier to teach.
Current Features
- Multi-language syntax highlighting for common programming languages and markup formats
- Theme selection to match your website, documentation, or slide design
- Line numbers toggle for referencing and code reviews
- Wrap long lines to prevent horizontal scrolling in narrow layouts
- One-click copy of highlighted code output
- Live preview so changes appear instantly as you type
- Sample loader to explore styles and settings quickly
Usage Instructions
- Paste or type your source code into the input area.
- Select the language that best matches your code for accurate token coloring.
- Choose a theme to control the overall visual style.
- Enable or disable line numbers and line wrapping based on your layout needs.
- Copy the highlighted code with one click and paste it into your docs, blog, or editor.
Notes and Tips
- Use line numbers when you need to reference specific lines in tutorials or reviews.
- Turn on line wrapping for long lines in narrow columns or mobile layouts.
- Keep snippets focused on the concept you want to explain to maximize clarity.
- Match the theme to your brand or slide deck for consistent presentation.
Typical Use Cases
- Writing developer documentation and API guides
- Creating tutorial content, blog posts, or course materials
- Sharing code examples in team chats or pull request comments
- Preparing presentations and workshops that require clean, readable code blocks