Code Syntax Highlighter
Paste code → choose language & theme → Copy or Download styled HTML. Private & fast.
About this code syntax highlighter
This free syntax highlighter uses Prism.js to style your code for blogs, docs and presentations. Choose a language (or Auto detect), switch between Light and Dark themes, enable line numbers, set a start line, specify highlight ranges, toggle wrap lines, then copy or download ready-to-paste HTML. Everything runs locally in your browser.
How to use
- Paste code and pick a language (or Auto).
- Choose a theme and options (line numbers, wrap, etc.).
- Click Highlight (or enable Auto re-highlight).
- Copy HTML or download a standalone file with CDN includes.
Tips
- Use “Highlight lines” like
3,7-9to emphasize steps. - Set “Start line” to align with docs/tutorial numbering.
- For JSON, select JSON to color keys/strings correctly.
Is it free?
Yes. No account required and no usage limits.
Do you store my code?
No. It runs locally in your browser. Optional settings are saved in your device’s localStorage.
How do I embed the result?
Use Copy HTML to paste into your CMS/Markdown (HTML blocks), or Download HTML for a standalone page including CDN links.
Last updated: October 20, 2025