Referencia completa de sintaxis Markdown con vista previa en vivo. Cubre Markdown estándar y extensiones de GitHub Flavored Markdown (GFM).
# Heading 1
H1 — largest heading
# My Title
## Heading 2
H2 — section heading
## Introduction
### Heading 3
H3 — subsection
### Details
#### Heading 4
H4
#### Notes
##### Heading 5
H5
##### Fine print
###### Heading 6
H6 — smallest heading
###### Footnote
Title ======
H1 — setext style (underline with ===)
My Title ========
Title ------
H2 — setext style (underline with ---)
My Section ----------
**bold**
Bold text
**important**
__bold__
Bold text (alternate)
__important__
*italic*
Italic text
*emphasis*
_italic_
Italic text (alternate)
_emphasis_
***bold italic***
Bold and italic
***critical***
~~strikethrough~~
Strikethrough (GFM)
~~deprecated~~
`inline code`
Inline code
`console.log()`
<mark>highlight</mark>
Highlighted text (HTML in MD)
<mark>key point</mark>
- Item - Item - Item
Unordered list (dash)
- Apple - Banana - Cherry
* Item * Item
Unordered list (asterisk)
* Alpha * Beta
+ Item + Item
Unordered list (plus)
+ One + Two
1. First 2. Second 3. Third
Ordered list
1. Step one 2. Step two 3. Step three
1. Item - Sub-item - Sub-item
Nested list (3 spaces indent)
1. Main - Sub A - Sub B
- [ ] Unchecked - [x] Checked
Task list (GFM)
- [ ] Todo - [x] Done
[text](url)
Inline link
[OpenAI](https://openai.com)
[text](url "title")
Link with title tooltip
[GitHub](https://github.com "GitHub")
[text][ref] [ref]: url
Reference-style link
[Google][goo] [goo]: https://google.com
<https://url>
Autolink (bare URL)
<https://example.com>
Inline image
Image with title
[](url)
Linked image
[](https://site.com)
`code`
Inline code
Use `npm install`
``` code ```
Fenced code block
```
console.log('hi')
``````javascript code ```
Syntax highlighted code
```python
print('hello')
```indented code
Code block via 4-space indent
def hello():
pass``code with `backtick` inside``
Double backticks for inline code with backtick
``Use `code` here``
| Col1 | Col2 | |------|------| | A | B |
Basic table (GFM)
| Name | Age | |------|-----| | Ana | 25 |
| Left | Center | Right | |:-----|:------:|------:|
Column alignment (GFM)
| Left | Center | Right | |:-----|:------:|------: | a | b | c |
> Quote text
Blockquote
> To be or not to be.
> Line 1 > Line 2
Multi-line blockquote
> First line > Second line
> Outer > > Nested
Nested blockquote
> Level 1 > > Level 2
> **Note:** text
Styled blockquote with bold
> **Warning:** Be careful!
- [ ] Unchecked task
Unchecked checkbox (GFM)
- [ ] Write tests
- [x] Completed task
Checked checkbox (GFM)
- [x] Deploy app
- [ ] Task - [ ] Subtask
Nested task list
- [ ] Feature - [x] API done - [ ] UI todo
---
Horizontal rule (thematic break)
Section 1 --- Section 2
***
Horizontal rule (3 asterisks)
***
\*escaped\*
Escape Markdown characters with \
\*not bold\*
<br>
Forced line break within paragraph
Line one<br>Line two
Two trailing spaces next line
Hard line break (2 spaces + enter)
First line Second line
<!-- comment -->
HTML comment (hidden in output)
<!-- TODO: fix this -->
~~strikethrough~~
Strikethrough
~~old text~~
https://auto.link
Autolink (bare URL auto-linked)
https://example.com
@username
User mention (GitHub)
@octocat
#123
Issue/PR reference (GitHub)
Fixes #42
SHA reference
Commit SHA reference (GitHub)
a5c3785
```mermaid graph ```
Mermaid diagram (GitHub/GitLab)
```mermaid graph LR A-->B ```
> [!NOTE]
GitHub alerts (NOTE/TIP/WARNING/CAUTION)
> [!WARNING] > Be careful!
Las tablas son una extensión de GitHub Flavored Markdown (GFM). Usa tuberías '|' para separar columnas, y dos puntos en la fila separadora para alinear el contenido:|
| Name | Role | Score | |:--------|:---------:|------:| | Alice | Developer | 100 | | Bob | Designer | 95 |
:--- Left align:---: Center---: Right alignWrite and preview Markdown in real-time — with live renderingy opciones de exportación.
Markdown es un lenguaje de marcado ligero creado por John Gruber en 2004. Usa sintaxis de texto plano para crear HTML: #encabezados, **negrita**, *cursiva*, [enlaces], `código`, y más. Se usa en README, GitHub, Reddit, Slack y muchos sistemas de documentación.
CommonMark es una especificación estandarizada de Markdown. GitHub Flavored Markdown (GFM) la extiende con listas de tareas, tablas, tachado, autoenlaces y resaltado de sintaxis en bloques de código.
Usa triple acento grave seguido del nombre del lenguaje: ```javascript. Los lenguajes soportados incluyen javascript, python, typescript, bash, css, html, json, yaml, sql y muchos más.
Usa una barra invertida antes del carácter: \* para *, \_ para _, \` para `, \# para #. Esto evita que Markdown los interprete como sintaxis de formato.