Arduino Syntax Highlighter

About this tool

Paste an Arduino sketch or C++ snippet to get color syntax highlighting you can view full-screen, or copy as ready-to-paste HTML (for a blog post, forum answer, or documentation page) alongside the plain, unhighlighted text.

Highlighting runs entirely in your browser using Prism.js — nothing is uploaded.

Frequently asked questions

What does "Copy as HTML" give me?

The highlighted markup (with Prism's token class names) as raw HTML — paste it into a page that includes Prism's CSS to reproduce the same coloring, or adapt the classes to your own site's styles.

Does this check whether my sketch would compile?

No — it's a highlighter, not a compiler. It colors code based on C/C++ syntax patterns (keywords, types, strings, comments), Arduino-specific functions included, even if the code has errors.

Does it recognize Arduino-specific functions like digitalWrite?

Yes — this uses Prism's Arduino grammar, a C++ variant that additionally recognizes core Arduino API functions and constants (like digitalWrite, HIGH, OUTPUT) as a distinct token type.