Code Syntax Highlighter

Highlight code snippets in 50+ programming languages with beautiful syntax coloring. Choose from 7 professional themes, add line numbers, highlight specific lines, and export as HTML for blogs and documentation.

Client-Side Processing

All syntax highlighting happens in your browser. Your code never leaves your device.

1

50+ Languages

Support for all major programming languages and markup formats.

7 Themes

Beautiful syntax themes from GitHub Dark to Solarized Light.

Line Highlighting

Highlight specific lines or ranges to draw attention to important code.

Export & Embed

Export as HTML or generate embed code for your blog or documentation.

Professional Code Syntax Highlighting

The Code Syntax Highlighter transforms plain code into beautifully formatted, color-coded snippets ready for blogs, documentation, presentations, and tutorials. Supporting over 50 programming languages from JavaScript and Python to Rust and Solidity, this free tool offers 7 professionally designed themes including GitHub Dark, Monokai, Dracula, and Nord. Add line numbers, highlight specific lines or ranges, copy formatted code, export as HTML, and generate embed codes for seamless integration into your content.

Why Use Code Syntax Highlighting?

Improved Readability

Color-coded syntax makes code significantly easier to read and understand. Different colors for keywords, strings, comments, and functions help readers quickly grasp code structure.

Professional Documentation

Create polished technical documentation, tutorials, and README files with properly highlighted code examples that look professional and are easy to follow.

Blog Integration

Export highlighted code as HTML or copy embed codes for WordPress, Medium, Ghost, or any blogging platform. Share code snippets that look great and maintain formatting.

Educational Content

Highlight specific lines to draw attention to important concepts in tutorials, courses, and educational materials. Make learning code more engaging and effective.

Key Features

  • ✓50+ Programming Languages: JavaScript, TypeScript, Python, Java, C++, C#, PHP, Ruby, Go, Rust, Swift, Kotlin, HTML, CSS, SQL, and 40+ more.
  • ✓7 Beautiful Themes: GitHub Dark, GitHub Light, Monokai, Dracula, Nord, Solarized Dark, and Solarized Light.
  • ✓Line Numbers: Toggle line numbers on/off to match your documentation style and formatting preferences.
  • ✓Line Highlighting: Highlight specific lines (e.g., "1,3-5,7") or ranges to emphasize important code sections.
  • ✓Copy Highlighted Code: Copy formatted HTML code to clipboard with syntax coloring preserved for pasting into rich text editors.
  • ✓Export to HTML: Download complete HTML file with embedded styles ready to embed in websites or documentation.
  • ✓Embed Code Generation: Generate HTML embed code to paste directly into blog posts, wikis, or CMS platforms.
  • ✓Live Preview: See highlighted code in real-time as you type or adjust settings with instant visual feedback.
  • ✓Syntax Recognition: Automatic recognition of keywords, strings, comments, functions, numbers, operators, and class names.
  • ✓Sample Code: Load sample code for each language to preview syntax highlighting and explore color schemes.

Supported Languages

Web Development

  • • JavaScript
  • • TypeScript
  • • HTML
  • • CSS
  • • PHP
  • • GraphQL

General Purpose

  • • Python
  • • Java
  • • C++
  • • C#
  • • Go
  • • Rust

Scripting & Shell

  • • Bash
  • • PowerShell
  • • Ruby
  • • Perl
  • • Lua
  • • R

Data & Config

  • • SQL
  • • JSON
  • • YAML
  • • Markdown
  • • Docker
  • • Nginx

Plus: Swift, Kotlin, Scala, Dart, Elixir, Haskell, Clojure, Objective-C, F#, OCaml, Erlang, Julia, Groovy, Solidity, VHDL, Verilog, Assembly, COBOL, Fortran, MATLAB, and more.

Common Use Cases

Technical Blog Posts: Share code tutorials and programming tips on your blog with professional syntax highlighting that matches your site's design.

Documentation Sites: Create API documentation, user guides, and technical references with clearly highlighted code examples.

GitHub README Files: While GitHub has built-in highlighting, use this tool to create code images or HTML snippets for external documentation.

Code Reviews: Highlight specific lines when discussing code in pull requests, code reviews, or team documentation.

Educational Content: Create programming tutorials, coding courses, and learning materials with highlighted code examples that are easy to follow.

Stack Overflow & Forums: Generate formatted code snippets for posting questions or answers on developer forums and Q&A sites.

How to Use the Code Syntax Highlighter

  1. 1.Paste your code into the input area or click "Load Sample" to see example code for the selected language.
  2. 2.Select your programming language from the dropdown (50+ languages available) for accurate syntax recognition.
  3. 3.Choose a theme that matches your blog or documentation style (7 themes from dark to light).
  4. 4.Optionally highlight specific lines by entering line numbers (e.g., "1,3-5,7" for lines 1, 3 through 5, and 7).
  5. 5.Toggle line numbers on or off depending on your preference and use case.
  6. 6.Copy the highlighted code, export as HTML, or copy the embed code to use in your content.

Available Themes

GitHub Dark

The popular dark theme from GitHub with subtle colors and excellent readability. Perfect for dark-mode documentation.

function greet() { // Dark theme }

GitHub Light

Clean, professional light theme matching GitHub's light mode. Ideal for print-friendly documentation.

function greet() { // Light theme }

Monokai

Classic Sublime Text theme with vibrant colors and high contrast. Popular among developers worldwide.

function greet() { // Monokai }

Dracula

Eye-friendly dark theme with purple and pink accents. Widely used in VS Code and other editors.

function greet() { // Dracula }

Line Highlighting Examples

Single Line: Enter "5" to highlight only line 5

Multiple Lines: Enter "1,3,7" to highlight lines 1, 3, and 7

Range of Lines: Enter "3-8" to highlight lines 3 through 8

Combined: Enter "1,3-5,7,10-12" to highlight line 1, lines 3-5, line 7, and lines 10-12

Advanced Features (Premium)

Premium users get access to advanced export options and customization features:

  • •Export as PNG: Generate high-resolution PNG images of your highlighted code with custom resolution settings.
  • •Export as SVG: Create scalable vector graphics perfect for presentations, print materials, and high-DPI displays.
  • •Custom Themes: Design and save your own color schemes with full control over syntax colors and background.
  • •Theme Library: Save multiple custom themes and switch between them instantly for different projects.
  • •Advanced Customization: Control font size, line height, padding, and border radius for pixel-perfect formatting.
  • •Batch Processing: Highlight multiple code snippets at once with consistent styling across all files.

Best Practices

Choose Readable Themes: Match the theme to your site's design. Use dark themes for dark sites, light themes for light sites.

Highlight Sparingly: Only highlight lines that need emphasis. Too much highlighting reduces its effectiveness.

Keep Code Concise: Show only relevant code snippets. Trim unnecessary boilerplate to focus on the important parts.

Add Context: Include comments or descriptions around highlighted code to explain what's being demonstrated.

Test Accessibility: Ensure sufficient color contrast for readability, especially for users with visual impairments.

Export and Embed Options

Export as HTML (Free)

Downloads a complete HTML file with embedded CSS styling. The file includes:

  • • All syntax highlighting preserved
  • • Line numbers (if enabled)
  • • Highlighted lines with background color
  • • Responsive layout that works on all devices
  • • Ready to upload to any website or documentation platform

Copy Embed Code (Free)

Generates HTML embed code to paste directly into blog posts or documentation:

  • • Inline styles for maximum compatibility
  • • Works in WordPress, Medium, Ghost, and other CMS platforms
  • • No external dependencies or JavaScript required
  • • Preserves formatting across different platforms

Privacy and Security

All code syntax highlighting happens entirely in your browser using JavaScript. Your code never leaves your device, is never uploaded to our servers, and is never stored or logged anywhere. This ensures complete privacy and security for proprietary code, sensitive algorithms, or confidential project snippets.

Browser Compatibility

The Code Syntax Highlighter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience with copy-to-clipboard and export features, we recommend using the latest version of Chrome or Firefox.

Frequently Asked Questions

How many programming languages are supported?

The highlighter supports 50+ programming languages including all major languages like JavaScript, Python, Java, C++, Go, Rust, and many more specialized languages.

Can I customize the color scheme?

Free users can choose from 7 professionally designed themes. Premium users can create fully custom color schemes with control over every syntax element color.

How do I highlight multiple lines?

Enter line numbers in the "Highlight Lines" field using commas and hyphens. For example: "1,3-5,7" highlights line 1, lines 3 through 5, and line 7.

Can I use the highlighted code in my blog?

Yes! Export as HTML or copy the embed code to paste into WordPress, Medium, Ghost, or any blogging platform. The formatting is preserved across platforms.

Is there a limit on code length?

No limits! Highlight code snippets of any length, from single lines to entire files. The tool handles small snippets to large code blocks equally well.

How do I export code as an image?

Image export (PNG/SVG) is a premium feature. Premium users can export code as high-resolution images with custom sizing and formatting options.

Does it work offline?

Yes! Once the page loads, all syntax highlighting works completely offline in your browser. No internet connection required for highlighting or exporting.

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