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Prism · JS, TS, Py, SQL, Bash, JSON, CSS, HTML

Markdown Syntax Highlighter

Renders Markdown with Prism syntax-highlighted code fences — drop-in HTML for blogs, docs, and static sites.

Markdown Syntax Highlighter
Code blocks
3
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Languages
3
js, python, sql
HTML
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input · markdown + code
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Quick Start

How to highlight Markdown code

Paste Markdown with fenced code blocks — each fence is highlighted via Prism in the language it's tagged with.

  1. 01

    Tag your fences

    Use the language id after the opening fence: ```js, ```python, etc.

    Parsing runs through marked with GFM extensions enabled — tables, task lists, strikethrough, and fenced code blocks all match GitHub’s rendering.

    fenceGFMmarkedCommonMarklive
    lang · markdownjs · GFM
    ```js
console.log(1);
```
    loaded · GFMGFM · ready
  2. 02

    Prism highlights

    Tokens are coloured using the Tomorrow theme.

    Soft-break behaviour is configurable: by default a single newline becomes a space (CommonMark), toggle on for chat-style <br> insertion.

    prismsoft-breaksoptionsconfiglive
    prism · optionstomorrow · live
    <span class="token">…
    options applied · livelive
  3. 03

    Toggle view

    Preview shows rendered HTML; HTML source shows raw markup to copy.

    The preview is scoped under a .mde class so its CSS doesn’t bleed into the rest of the page. Output HTML is whitespace-controlled for clean diffs.

    viewpreviewscoped CSSrenderstable
    view · renderedsrc · ready
    <pre class="language-js">
    rendered · liverendered
  4. 04

    Copy HTML

    Drop straight into a blog post or static-site template.

    Export covers both raw Markdown and rendered HTML; downloads stream as text/markdown or text/html via Blob + object URL.

    exportclipboard.md.htmlblob
    ✓ · exportedhtml · done
    ✓ Copied HTML
    shipped · ready to shipsuccess
Pro tips

Author Markdown that renders everywhere

GFM is the safe default

GitHub-Flavored Markdown is the de-facto baseline (tables, task lists, strikethrough). CommonMark is stricter but ubiquitous as a fallback.

Soft-break behaviour varies

A single newline is a space in CommonMark, a <br> in GFM. Toggle soft breaks when source matters.

Escape inside code fences

Backticks inside fenced blocks need a longer fence — three becomes four. Use ~~~ if your content has many backticks.

Anchors are slugified

GitHub lowercases, strips punctuation, and joins with hyphens. Duplicate headings get -1, -2 suffixes.

Tables need a header row

The dash row sets alignment (:---, :-:, ---:). Use Table Aligner for diff-friendly columns.

Front matter is YAML

Triple-dash blocks at the top of files are parsed by static-site generators. Use the Front-Matter Validator to catch syntax errors.

Related toolsMD to HTMLGitHub PreviewCode ExtractorLang TaggerSnippet RunnerEditor
Use Cases

When to syntax-highlight

Blogs, docs, lessons.

Static blogs

Generate ready-to-paste highlighted HTML. Render path uses marked with GFM extensions enabled (tables, task lists, strikethrough, autolinks), so what you preview matches what GitHub publishes bit-for-bit. Soft-break behaviour is configurable for chat-style vs prose Markdown.

GFM-compliant

Docs sites

Prism CSS classes work with most theme systems. Pairs cleanly with the Markdown Cheatsheet for syntax you can't quite remember — callout blocks, footnotes, definition lists. Output stays diff-friendly so style-only changes don't drown out real edits in PRs.

GitHub-perfect

Tutorials

Show code with proper colouring out-of-the-box. Cross-platform safe: anchors, code fences, and tables behave identically on GitHub, GitLab, Bitbucket, and Gitea. Heading-anchor slugs follow GitHub's lowercase-and-hyphenate rules so deep links survive a docs migration.

diff-friendly

Newsletters

Email HTML supports highlighted blocks via inline CSS. No server roundtrip — perfect for proprietary content you can't paste into a public tool. The full marked + GFM bundle ships with the page, so it works offline once loaded.

render-stable

Code reviews

Share highlighted snippets out of the IDE. Front matter (YAML / TOML / JSON) passes through unchanged so static-site pipelines (Jekyll, Hugo, Astro, Eleventy) read it correctly. Pair with the Front-Matter Validator to catch syntax errors before deploy.

cross-platform

Slide decks

Paste into reveal.js or similar Markdown decks. Output is reproducible: identical input always produces identical Markdown, so doc-generation scripts can rely on it for snapshot tests and embedded into release workflows.

SEO-friendly
FAQ

Frequently asked questions

JS, TS, Python, SQL, Bash, JSON, CSS, and HTML out of the box — add more by importing extra Prism components.
Tomorrow Night by default. Swap by replacing the imported Prism CSS.
Not enabled — add Prism's line-numbers plugin if you need them.
Code is escaped and rendered without highlighting — still safe HTML.
No — Prism runs locally in your browser.
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