我的文本会被保存吗？

不会保存到服务器，请自行复制或下载。

我的文件会被上传吗？

不会。一切都在浏览器中完成，你的 Markdown 不会离开设备。

在线 Markdown 编辑器

Q: 我的文本会被保存吗？

不会保存到服务器，请自行复制或下载。

使用工具栏编写 Markdown 并实时预览。无需账号，不上传云端。

# Markdown Viewer & Editor: Live Preview, Math, PDF and HTML Export

Paste, type, or **drop a `.md` file** into this free online Markdown viewer and watch it render in real time. The preview runs through the same pipeline as **Download HTML** and **Export PDF**, so what you see on screen is exactly what your readers get: no export surprises, no missing checkboxes, no broken footnotes, no garbled formulas.

This page is a live tour. Edit it, break it, export it. Every construct below is rendered by the workspace you are looking at.

## Why Choose This Markdown Editor

- **Private by default.** No account and no upload. Your Markdown is rendered in your browser and never leaves your machine.
- **What you see is what you export.** Preview, PDF, and HTML download share one render pipeline and one theme stylesheet.
- **Nine preview styles.** Magazine, Terminal, Newspaper, Soft, Glass, Kindle, Slides, Claude, and HTML. Each has a tunable palette, and the theme travels inside the exported file.
- **Accurate math.** LaTeX formulas are typeset with MathJax as you type and exported as self-contained SVG, so readers need neither MathJax nor web fonts.
- **One-click output.** Get an A4 PDF, a standalone HTML document, or a clean HTML fragment ready to paste into your site.
- **A complete toolbox.** Markdown viewer and editor, Markdown ⇄ HTML converters, a table generator, and a table of contents generator, all powered by the same rendering engine.
- **Built for long documents.** Drag-and-drop loading, an outline sidebar that jumps to any heading, and scroll-synced panes. The interface is available in English and 中文.

## Markdown Syntax Cheat Sheet and Showcase

Everything below is ordinary Markdown. If it renders here, it renders in your export. Use this section as a quick reference for the full CommonMark and GitHub Flavored Markdown (GFM) syntax.

### Headings

Section headings in this document use ATX syntax (`# Hash marks`). Levels 4 to 6 look like this:

#### Fourth-level heading

##### Fifth-level heading

###### Sixth-level heading

Setext headings use an underline instead of hash marks. The heading right below this paragraph is one:

Setext heading with an underline
--------------------------------

### Paragraphs and Line Breaks

A paragraph is one or more sentences separated by a blank line. A soft line break
inside a paragraph joins the lines with a space. End a line with two spaces  
to force a hard break, like this line does, or end it with a backslash\
to get the same break without trailing whitespace.

### Emphasis, Strikethrough, and Inline Code

*Italic with asterisks*, _italic with underscores_, **bold with asterisks**, __bold with underscores__, ***bold and italic***, and ~~strikethrough~~.

Inline code marks paths, commands, and keys, such as `.agents/skills/`, `npm run dev`, or `Ctrl` + `C`.

### Blockquotes

> A blockquote is a line or paragraph prefixed with `>`.
>
> Quotes can contain other blocks, including lists and more quotes:
>
> > A nested quote with a list:
> >
> > - one
> > - two

### Lists

Unordered lists accept three markers:

- dash
* asterisk
+ plus

Ordered lists keep their numbers and can nest:

1. First item
2. Second item
   1. Nested item one
   2. Nested item two
3. Third item

Lists can be loose, with blank lines between items, like this one:

- A loose item

- Another loose item

Task lists render as real checkboxes:

- [x] Render GFM task lists
- [x] Export checkboxes to PDF and HTML
- [ ] Break the preview (go on, try it)

### Code

Inline code is shown above. Indented code blocks use four spaces:

def indented():
        return "no language tag, still a code block"

Fenced code blocks keep their language tag. Backticks:

```js
// fenced with backticks and a language tag
export function hello(name) {
  return `Hello, ${name}!`;
}
```

Tildes work the same way:

~~~python
def hello(name: str) -> str:
    return f"Hello, {name}!"
~~~

### Horizontal Rules

Three equivalent markers produce a rule:

---

`---`, `***`, and `___` all render as the line above.

### Links

- Inline link with a title: [Markdown by John Gruber](https://daringfireball.net/projects/markdown/ "Markdown home")
- Reference-style link: [CommonMark specification][cm]
- Autolink in angle brackets: <https://commonmark.org>
- Bare URL (GFM autolink): https://example.com
- Link to a heading in this document: [From preview to file](#from-preview-to-file)

[cm]: https://spec.commonmark.org/ "CommonMark"

### Images

Inline and reference styles both work, and images are carried into PDF and HTML exports:

![Close-up of a yellow flower, reference-style image demo][demo-img]

![Close-up of a yellow flower, inline-style image demo](https://images.pexels.com/photos/18853925/pexels-photo-18853925.jpeg "Inline-style image")

[demo-img]: https://images.pexels.com/photos/20791127/pexels-photo-20791127.jpeg "Reference-style image"

### Tables

GFM tables support column alignment and inline formatting inside cells:

| Syntax     | Supported | Alignment demo |
| :--------- | :-------: | -------------: |
| **bold**   |    yes    |   right-aligned |
| `inline`   |    yes    |   right-aligned |
| ~~strike~~ |    yes    |   right-aligned |
| $E = mc^2$ |    yes    |   math in cells |
| `a \| b`   |    yes    |  escaped pipe   |

### Footnotes

Markdown keeps references out of the way, and footnotes are collected at the end of the document. Several references can point to the same note[^1].

### Backslash Escapes

A backslash prints the literal character: \*not italic\*, \_not italic\_, \[not a link\], \# not a heading, \| not a table pipe.

### Inline HTML (Sanitized)

A safe subset of raw HTML passes through the pipeline:

- Keyboard hints: press <kbd>Ctrl</kbd> + <kbd>S</kbd>
- Subscript and superscript: H2O and x2
- A hard break with a tag: this text starts on a new line

Anything unsafe, such as scripts, event handlers, or embedded frames, is stripped by the sanitizer.

### Math Formulas with LaTeX

Inline math such as $E = mc^2$ and $e^{i\pi} + 1 = 0$ is typeset with MathJax. Display equations are wrapped in `$$ … $$`:

$$
\int_{0}^{\infty} e^{-x^2}\,dx = \frac{\sqrt{\pi}}{2}
$$

Sums, fractions, and matrices render just as cleanly:

$$
\sum_{n=1}^{\infty} \frac{1}{n^2} = \frac{\pi^2}{6}
\qquad
A = \begin{pmatrix} a & b \\ c & d \end{pmatrix}
$$

Formulas render while you type and export as self-contained SVG.

## From Preview to File

Once your document looks right, take it anywhere:

- **Export PDF.** The themed preview as a print-ready A4 document.
- **Download HTML.** One self-contained file with styles and formulas embedded.
- **Copy as HTML.** A clean fragment you can paste straight into a website or CMS.
- **Copy or download Markdown.** Keep editing in your favorite editor.

## Frequently Asked Questions

### Is this Markdown viewer free and private?

Yes. It is free to use, needs no sign-up, and renders everything locally in your browser. Your documents are never uploaded.

### Does it support GitHub Flavored Markdown?

Yes. Tables, task lists, strikethrough, autolinks, fenced code blocks, and footnotes are all supported, along with the complete CommonMark syntax.

### Can I render LaTeX math in Markdown?

Yes. Write inline formulas between single dollar signs and display equations between double dollar signs. They are typeset with MathJax and exported as SVG.

### How do I convert Markdown to PDF or HTML?

Open or paste your document, pick a preview style, then choose **Export PDF** or **Download HTML**. The output matches the preview exactly.

[^1]: Footnotes are auto-numbered, and multiple references may share one note.

输入 Markdown 后在此预览