How to convert code to highlighted HTML
- Replace the sample with your source code.
- Select its language and a visual theme.
- Adjust optional line numbers, spacing, and background settings.
- Check the preview, then select Copy HTML.
Code to HTML Syntax Highlighter
Turn source code into syntax-highlighted HTML for websites, blogs, documentation, and CMS editors. Choose a language and theme, preview the result, and copy ready-to-use HTML.
Your code stays private. Everything is processed locally in your browser and is never uploaded to our servers.
Highlight source code and create HTML
If a font is unavailable, the browser uses a similar monospace fallback.
Preview
Loading the syntax highlighter…
Private by design. Your source code and generated HTML stay in this browser. They are not stored in cookies, local storage, URLs, logs, or analytics. Only generic events such as a language selection or successful copy may be counted.
What is syntax highlighting?
Syntax highlighting uses color and font styles to distinguish keywords, strings, comments, numbers, and other parts of source code. It makes code easier to scan without changing what the code says.
Does this tool format my code?
No. This is a syntax highlighter, not a formatter. It does not re-indent, prettify, lint, validate, or rewrite your source. The spaces and code you enter are preserved while safe presentation markup is added.
Is my code uploaded anywhere?
Nothing you paste is uploaded. The language and theme files needed for highlighting are bundled with this page, and all processing happens locally in your browser. The page does not put your code in persistent browser storage or analytics.
Where can I use the generated HTML?
You can use it in static websites, developer articles, blog posts, tutorials, documentation, internal documentation, and HTML-capable CMS pages. The output contains inline syntax colors and layout styles, so the destination does not need JavaScript, One Job Tools CSS, or an external stylesheet.
Some CMS platforms sanitize HTML or remove inline styles. Use an HTML-capable editor and preview the published result; no tool can guarantee that every CMS, plugin, or email client will preserve all styling.
Frequently Asked Questions
It is HTML that wraps parts of source code in styled elements so keywords, strings, comments, and other syntax appear in different colors.
No. It preserves your code and adds presentation markup; it does not re-indent, lint, validate, or rewrite it.
No. Highlighting and HTML generation happen locally in your browser, and the code is not stored or sent to analytics.
The curated list includes HTML, CSS, JavaScript, TypeScript, JSON, PHP, Python, Java, C, C++, C#, Go, Rust, Ruby, SQL, shell, PowerShell, XML, YAML, and Markdown.
Often, yes, when using an HTML-capable block or editor. WordPress configurations and plugins can sanitize inline styles, so preview the published result.
Some CMS platforms remove inline styles or alter HTML. Use a custom HTML mode and check the platform's sanitization rules.
Yes. Enable Show line numbers before copying the HTML.