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  3. Markdown Editor & Preview
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Markdown Editor & Preview

Full-featured Markdown editor with live preview, GitHub Flavored Markdown, syntax highlighting, table of contents, export to HTML/PDF, and multiple themes

Write Markdown on the left and watch a live HTML preview update on the right as you type. This tool renders a practical, GitHub-flavored subset of Markdown: headings, bold and italic, strikethrough, inline code and fenced code blocks, ordered and unordered lists, task lists, blockquotes, tables, links, images, and horizontal rules. When you are done you can copy the rendered HTML or download it. Markdown is great precisely because the syntax is small and readable. Text between single asterisks is italic, double is bold; three hyphens make a horizontal rule. Inline code uses single backticks; fenced code blocks use triple backticks with an optional language label. Tables use pipe-and-dash syntax (`| Header | Header |` and `|--------|--------|`), and task lists use `- [ ]` and `- [x]`. The live preview lets you confirm exactly how each of these renders before you publish.

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Markdown Editor & Preview: a worked example

You are drafting a README and want to see exactly how the headings, code block, and table will render on the repo host.

Markdown

# Setup

Run `npm i` then:

| Step | Cmd |
|------|-----|
| Dev  | `npm run dev` |
Markdown Editor & Preview produces

Rendered

A formatted "Setup" heading, inline code styling, and a real two-column table, updating live as you type.

The split-pane preview uses GitHub-flavoured Markdown, so tables, fenced code, and task lists render the way they will on the actual repo page, catching a broken table pipe before you commit. Everything renders in the browser; nothing is uploaded.

What is Markdown Editor & Preview?

Write Markdown on the left and watch a live HTML preview update on the right as you type. This tool renders a practical, GitHub-flavored subset of Markdown: headings, bold and italic, strikethrough, inline code and fenced code blocks, ordered and unordered lists, task lists, blockquotes, tables, links, images, and horizontal rules. When you are done you can copy the rendered HTML or download it. Markdown is great precisely because the syntax is small and readable. Text between single asterisks is italic, double is bold; three hyphens make a horizontal rule. Inline code uses single backticks; fenced code blocks use triple backticks with an optional language label. Tables use pipe-and-dash syntax (`| Header | Header |` and `|--------|--------|`), and task lists use `- [ ]` and `- [x]`. The live preview lets you confirm exactly how each of these renders before you publish.

How it works

This previewer is a fast, self-contained renderer that converts your Markdown to HTML in the browser - it does not depend on any external Markdown library, so it covers the common, everyday syntax rather than every corner of the full CommonMark specification. Knowing what it handles keeps surprises to a minimum.

Links and images use the inline form: `[text](url)` for links (rendered to open in a new tab) and `![alt](url)` for images. Reference-style links such as `[text][ref]` with a separate `[ref]: url` definition are not supported, so use the inline form. Headings `#` through `######` are rendered with anchor ids generated from their text. Bold (`**text**` or `__text__`), italic (`*text*` or `_text_`), strikethrough (`~~text~~`), inline code, blockquotes (`> `), bulleted and numbered lists, and GFM task lists all work. Tables are parsed from the pipe-and-dash header/separator/body pattern, and the colon markers in the separator row set per-column alignment (`:---` left, `:---:` center, `---:` right).

Fenced code blocks (triple backticks) are rendered in a monospace block, and a language label after the opening fence is preserved as a `language-...` CSS class on the code element - but the tool does not apply token-level syntax coloring inside code blocks, so do not expect Prism- or highlight.js-style colors there. There is also no LaTeX/math rendering. For the supported elements, the preview is an accurate, instant reflection of your source, which is what makes it useful for drafting README files, issues, and posts before you paste them into GitHub or a CMS.

How to use

  1. 1Enter Markdown in the left editor pane
  2. 2See the rendered preview update live on the right
  3. 3Use the toolbar buttons to insert bold, italic, links, tables, and more
  4. 4Copy or download the rendered HTML when you are done

Key features

  • Live side-by-side preview as you type
  • GitHub-flavored subset: headings, bold/italic, strikethrough, lists, task lists, blockquotes, tables, links, images, and horizontal rules
  • Fenced and inline code blocks (monospace, with a preserved language label but no token coloring)
  • Table column alignment from the :--- separator markers
  • Copy or download the rendered HTML

When to reach for this

  • Writing README files

    Draft and preview GitHub-style README files with tables, task lists, and code samples before pushing to your repository.

  • Preparing blog content

    Write posts in Markdown and verify formatting, link rendering, and image placement before publishing.

  • Learning Markdown syntax

    Experiment with Markdown elements and see the rendered result instantly, a great way to learn the syntax by doing.

Frequently asked questions

Which Markdown features are supported?

A practical GitHub-flavored subset: headings, bold, italic, strikethrough, inline and fenced code, ordered/unordered lists, task lists, blockquotes, tables (with column alignment), inline links and images, and horizontal rules. It is not a full CommonMark parser, so some advanced syntax (for example reference-style links) is not handled.

Are code blocks syntax-highlighted?

Fenced code blocks render in a monospace style and keep the language you write after the opening backticks as a CSS class, but the tool does not color the tokens inside the block. For full token highlighting, use the dedicated Code Syntax Highlighter tool.

Can I embed images?

Yes. Use the inline image syntax ![alt text](URL) and the preview will render the image from the provided URL.

Does it support LaTeX math?

No. There is no LaTeX or math rendering; math delimiters such as $...$ are shown as plain text.

Related tools and how they differ

  • HTML ↔ Markdown Converter: Converts existing HTML into Markdown (or back) with options for heading and code styles; use it to migrate content, not to author from scratch.
  • Markdown Table Generator: Builds one GFM table from a visual grid with per-column alignment and escaped pipes; use it when only the table syntax is the pain.
  • Code Syntax Highlighter: Themes a standalone code snippet and exports it as HTML or a PNG image; use it for shareable highlighted snippets, not full documents.

Private by design

Your text is processed locally in the browser. Nothing you paste or open is transmitted or logged.