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:arrow_right: Check the source of this note :arrow_left:

Read the complete tutorial

Introduction

HackMD is a realtime, multi-platform collaborative markdown knowledge base.
You can write notes with other people on your desktop, tablet or even on the phone.

Please report new issues in GitHub.
If you need instant help, please send us a Facebook message.
Thank you very much!

Workspace

Modes

Desktop & Tablet

Edit: See only the editor.
View: See only the result.
Both: See both in split view.

Mobile

View: See only the result.
Edit: See only the editor.

Image Upload:

You can upload an image simply by clicking on the camera button .

Alternatively, you can drag-n-drop an image into the editor. Even pasting images works!

Dragging and pasting will automatically upload the image to HackMD, nothing to worry. :tada:

:bulb: Free users can upload images up to 1 MB. Paid users can upload 20 MB.

Share Notes:

Press the share button on the top right of the menu and click Copy button to copy the note URL link to your clipboard.

To publish and customize the note URL with permalink, please read How to Publish a Note with Permalink.

Save a Note:

Currently, you can save to Dropbox , Google Drive, Gist or save an .md file and .html locally.

Import Notes:

Similarly to the save feature, you can also import an .md or .html file from Dropbox , Google Drive, Gist or import content from your clipboard , and that can parse some HTML which might be useful :smiley:

Permissions:

It is possible to change permissions to a note through the button on the share button on the top right of the menu, click the button and you will see the Sharing menu.

For read and write permissions, you can either choose: Owners, Signed-in users or Everyone.

For commenting permission, please click More in the sharing menu and choose either: Forbidden, Owners, Signed-in users or Everyone. You even can disable the commenting feature through the toggle to the right of the commenting label.

Only the owners of the note can change above permissions.

To invite specific user to a note, please read Invite Others to a Private Note.

Embed a Note:

Notes can be embedded using iframe as follows:

<iframe width="100%" height="500" src="https://hackmd.io/features" frameborder="0"></iframe>

Or you can use embed syntax to include a note seamlessly, please read Embedding another note.

Slide Mode:

You can use a special syntax to organize your note into slides.
After that, you can use the Slide Mode to make a presentation.
Visit the above link for details.

Book Mode:

You can make your notes into a book.
List your links in order or nest them.
Then use the Book Mode to make a collection.
Visit the above link for details.

View

Table of Contents:

You can look at the bottom right section of the view area, there is a ToC button .
Pressing that button will show you a current Table of Contents, and will highlight which section you're at.
If the view area is wide enough, to ToC will show directly at the right section of the view area.

ToCs support up to three header levels.

Every header will automatically add a url link on the left side.
You can hover and click to anchor on it.

Edit:

Shortcut Keys:

Just like Sublime text, which is pretty quick and convenient.

For more infomation, see here.

Auto-Complete:

This editor provides full auto-complete hints in markdown.

  • Emojis: type : to show hints.
  • Code blocks: type ``` and plus a character to show hint. ```
  • Headers: type # to show hint.
  • Referrals: type [] to show hint.
  • Externals: type {} to show hint.
  • Images: type ! to show hint.

Title:

This will take the first level 1 header as the note title.

Tags:

Using tags as follows, the specified tags will show in your note list.

tags: features cool updated

YAML Metadata

You can provide advanced note information to set the browser behavior (visit above link for details):

  • title: set note title
  • description: set note description
  • image: set note default image (for link preview)
  • tags: set note tags
  • robots: set web robots meta
  • lang: set browser language
  • dir: set text direction
  • breaks: set to use line breaks
  • GA: set to use Google Analytics
  • disqus: set to use Disqus
  • slideOptions: setup slide mode options

ToC:

Use the syntax [TOC] to embed table of content into your note.

Emoji

You can type any emoji like this :smile: :smiley: :cry: :wink:

See full emoji list here.

ToDo List:

  • ToDos
    • Buy some salad
    • Brush teeth
    • Drink some water

Code Block:

We support many programming languages, use the auto complete function to see the entire list.
















var s = "JavaScript syntax highlighting";
alert(s);
function $initHighlight(block, cls) {
  try {
    if (cls.search(/\bno\-highlight\b/) != -1)
      return process(block, true, 0x0F) +
             ' class=""';
  } catch (e) {
    /* handle exception */
  }
  for (var i = 0 / 2; i < classes.length; i++) {
    if (checkCondition(classes[i]) === undefined)
      return /\d+[\s/]/g;
  }
}

If you want line numbers, type = after specifying the code block languages.
Also, you can specify the start line number.
Like below, the line number starts from 101:
















var s = "JavaScript syntax highlighting";
alert(s);
function $initHighlight(block, cls) {
  try {
    if (cls.search(/\bno\-highlight\b/) != -1)
      return process(block, true, 0x0F) +
             ' class=""';
  } catch (e) {
    /* handle exception */
  }
  for (var i = 0 / 2; i < classes.length; i++) {
    if (checkCondition(classes[i]) === undefined)
      return /\d+[\s/]/g;
  }
}

Or you might want to continue the previous code block's line number, use =+



var s = "JavaScript syntax highlighting";
alert(s);

Sometimes you have a super long text without breaks. It's time to use ! to wrap your code.

When you’re a carpenter making a beautiful chest of drawers, you’re not going to use a piece of plywood on the back.

Blockquote Tags:

Using the syntax below to specifiy your name, time and color to vary the blockquotes.
ChengHan WuSun, Jun 28, 2015 9:59 PM

Even support the nest blockquotes!
ChengHan WuSun, Jun 28, 2015 10:00 PM

Render CSV as table

You can use write csv in the codeblock:

```csvpreview {header="true"}
firstName,lastName,email,phoneNumber
John,Doe,john@doe.com,0123456789
Jane,Doe,jane@doe.com,9876543210
James,Bond,james.bond@mi6.co.uk,0612345678
```

which rendered to:

firstNamelastNameemailphoneNumber
JohnDoejohn@doe.com0123456789
JaneDoejane@doe.com9876543210
JamesBondjames.bond@mi6.co.uk0612345678

We use Papa Parse for parsing csv. The parsing option is given in braces: {}, and multiple options are seperated by a space. e.g. {header="true" delimiter="."}. Please read their documentation as reference.

Externals

YouTube

Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
  • The image format is not supported
Learn More →

Vimeo

Gist

require 'net/http'
require 'uri'
# /api/v1/:format/new
# /api/v1/:format/gists/:user
# /api/v1/:format/:gist_id
res = Net::HTTP.post_form(URI.parse('http://gist.github.com/api/v1/xml/new'),
{ 'files[file1.ab]' => 'CONTNETS',
'files[file2.ab]' => 'contents' })
puts res.body
view raw example_gist_create.rb hosted with ❤ by GitHub
<?xml version="1.0" encoding="UTF-8"?>
<gists type="array">
<gist>
<public type="boolean">true</public>
<description nil="true"></description>
<repo>4278</repo>
<created-at type="datetime">2008-08-06T13:30:32-07:00</created-at>
</gist>
</gists>
view raw output.xml hosted with ❤ by GitHub

SlideShare

26 Disruptive & Technology Trends 2016 - 2018 from Brian Solis

Speakerdeck

PDF

Caution: this might be blocked by your browser if not using an https URL.

Figma

MathJax

You can render LaTeX mathematical expressions using MathJax, as on math.stackexchange.com, except the space after the start $ and the space before the end $ are not allowed in the inline math:

The Gamma function satisfying Γ(n)=(n−1)!∀n∈N is via the Euler integral

For block level math, please give $$ and a line break before and after your math formula:

x=−b±b2−4ac2a.

Γ(z)=∫0∞tz−1e−tdt.

More information about LaTeX mathematical expressions here.

UML Diagrams

Sequence Diagrams

You can render sequence diagrams like this:

Created with Raphaël 2.2.0AliceAliceBobBobHello Bob, how are you?Bob thinksI am good thanks!Alice respondsWhere have you been?

Flow Charts

Flow charts can be specified like this:

Created with Raphaël 2.2.0StartMy OperationlalalaYes or No?Endyesno

Graphviz







hierarchy



Headteacher

Headteacher



Deputy1

Deputy1



Headteacher->Deputy1





Deputy2

Deputy2



Headteacher->Deputy2





BusinessManager

BusinessManager



Headteacher->BusinessManager





Teacher1

Teacher1



Deputy1->Teacher1





Teacher2

Teacher2



Deputy1->Teacher2





ITManager

ITManager



BusinessManager->ITManager

Mermaid

2014-01-052014-01-122014-01-192014-01-262014-02-022014-02-092014-02-16A task           Task in sec      anther task      Another task     SectionAnotherA Gantt Diagram

Abc

Created with Raphaël 2.1.2Speed the PloughTrad.

PlantUML

Vega-Lite

0100200300400500Sum of yieldGlabronManchuriaNo. 457No. 462No. 475PeatlandSvansotaTrebiVelvetWisconsin No. 38varietyCrookstonDuluthGrand RapidsMorrisUniversity FarmWasecasite


  
  
  

Save as SVGSave as PNGView SourceView Compiled VegaOpen in Vega Editor

Fretboard

-oO-*-
--o-o-
-o-oo-
-o-oO-
-oo-o-
-*O-o-
  3

More information about sequence diagrams syntax here.
More information about flow charts syntax here.
More information about graphviz syntax here
More information about mermaid syntax here
More information about abc syntax here
More information about vega syntax here
More information about fretboard syntax here

Alert Area

Yes :tada:

This is a message :mega:

Watch out :zap:

Oh No! :fire:

Click to show details

You found me :stuck_out_tongue_winking_eye:

Expand the spoiler container by default

You found me :stuck_out_tongue_winking_eye:

Typography

Headers

# h1 Heading
## h2 Heading
### h3 Heading
#### h4 Heading
##### h5 Heading
###### h6 Heading

Horizontal Rules

Typographic Replacements

Enable typographer option to see result.

© © ® ® ™ ™ § § ±

test.. test… test… test?.. test!..

!!! ??? ,

Remarkable – awesome

"Smartypants, double quotes"

'Smartypants, single quotes'

Emphasis

This is bold text

This is bold text

This is italic text

This is italic text

Deleted text

lulala

Superscript: 19th

Subscript: H2O

Inserted text

Marked text

ruby baserubytext

Blockquotes

Blockquotes can also be nested…

…by using additional greater-than signs right next to each other…

…or with spaces between arrows.

Lists

Unordered

  • Create a list by starting a line with +, -, or *
  • Sub-lists are made by indenting 2 spaces:
    • Marker character change forces new list start:
      • Ac tristique libero volutpat at
      • Facilisis in pretium nisl aliquet
      • Nulla volutpat aliquam velit
  • Very easy!

Ordered

  1. Lorem ipsum dolor sit amet
  2. Consectetur adipiscing elit
  3. Integer molestie lorem at massa
  4. You can use sequential numbers…
  1. …or keep all the numbers as 1.
  2. feafw
  3. 332
  4. 242
  5. 2552
  6. e2

Start numbering with offset:

  1. foo
  2. bar

Code

Inline code

Indented code

​​​​// Some comments
​​​​line 1 of code
​​​​line 2 of code
​​​​line 3 of code

Block code "fences"

Sample text here...

Syntax highlighting

var foo = function (bar) {
  return bar++;
};

console.log(foo(5));

Tables

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Right aligned columns

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Left aligned columns

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Center aligned columns

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

link text
link with title
Autoconverted link https://github.com/nodeca/pica

Images

Minion
Stormtroopocat
Like links, Images also have a footnote style syntax
Alt text
With a reference later in the document defining the URL location:

Minion
Show the image with given size

Footnotes

Footnote 1 link[1].
Footnote 2 link[2].
Inline footnote[3] definition.
Duplicated footnote reference[2:1].

Definition Lists

Term 1

Definition 1
with lazy continuation.

Term 2 with inline markup

Definition 2

​​​​​​  { some code, part of Definition 2 }

Third paragraph of definition 2.

Compact style:

Term 1
Definition 1
Term 2
Definition 2a
Definition 2b

Abbreviations

This is an HTML abbreviation example.
It converts "HTML", but keeps intact partial entries like "xxxHTMLyyy" and so on.

  1. Footnote can have markup
    and multiple paragraphs. ↩︎

  2. Footnote text. ↩︎ ↩︎

  3. Text of inline footnote ↩︎

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