Is there a keyboard shortcut to format code in Notepad++ ?

I'm mainly working with HTML, CSS and Python code.

<title>{% block title %}    {% endblock %}</title>      
 <link rel="stylesheet" href="/media/style.css" type="text/css" media="screen" />
</head>

To:

<head>
  <title>
    {% block title %}
    {% endblock %}
  </title>
  <link rel="stylesheet" href="/media/style.css" type="text/css" media="screen" />
</head>

I remember Visual Studio doing it with Ctrl+K+D and NetBeans having the feature too but can't find it within Notepad++, if it can even do it.

TextFX -> HTML Tidy -> Tidy: Reindent XML

Remember to have the HTML code selected before you do this.

there is such a plugin as UniversalIndentGUI, it can be installed right from the plugin manager and has possibilities to reindent the most used programming languages.

If you go to TextFX menu and go to TextFX Edit, you will see a menu item Reindent C++ Code.

That will also format C# code.

ANSWER AS OF June 2019

Install the XML Tools plugin from the Plugin Admin (in Notepad++ 7.7 at least)

Then click Plugins -> XML Tools -> Pretty Print (XML Only with Line breaks)

That did it for me.

Here is a list of the available shortcuts in Notepad++.

In case your desired functionality is not available, you are able to define own macros and assign them to a custom shortcut (i am not used to use macros).

UPDATE: I will post the shortcuts here in case the link gets invalid:

Shortcut    Command

Ctrl-C  Copy
Ctrl-X  Cut
Ctrl-V  Paste
Ctrl-Z  Undo
Ctrl-Y  Redo
Ctrl-A  Select All
Ctrl-F  Launch Find Dialog
Ctrl-H  Launch Find / Replace Dialog
Ctrl-D  Duplicate Current Line
Ctrl-L  Delete Current Line
Ctrl-T  Switch the current line position with the previous line position
F3  Find Next
Shft-F3 Find Previous
Ctrl-Shft-F Find in Files
Ctrl-F3 Find (volatil) Next
Ctrl-Shft-F3    Find (volatil) Previous
Ctrl-Shft-I Incremental Search
Ctrl-S  Save File
Ctrl-Alt-S  Save As
Ctrl-Shft-S Save All
Ctrl-O  Open File
Ctrl-N  New File
Ctrl-F2 Toggle Bookmark
F2  Go To Next Bookmark 
Shft-F2 Go To Previous Bookmark
Ctrl-G  Launch GoToLine Dialog
Ctrl-W  Close Current Document
Alt-Shft-Arrow keys or Alt + Left mouse click   Column Mode Select
F5  Launch Run Dialog
Ctrl-Space  Launch CallTip ListBox
Alt-Space   Launch Word Completion ListBox
Tab (selection of several lines)    Insert Tabulation or Space (Indent)
Shft-Tab (selection of several lines)   Remove Tabulation or Space (outdent)
Ctrl-(Keypad-/Keypad+) or Ctrl + mouse wheel butto  Zoom in (+ or up) and Zoom out (- or down)
Ctrl-Keypad/    Restore the original size from zoom 
F11 Toggle Full Screen Mode
Ctrl-Tab    Next Document
Ctrl-Shft-Tab   Previous Document
Ctrl-Shft-Up    Move Current Line Up
Ctrl-Shft-Down  Move Current Line Down
Ctrl-Alt-F  Collapse the Current Level
Ctrl-Alt-Shft-F Uncollapse the Current Level
Alt-0   Fold All
Alt-(1~8)   Collapse the Level (1~8)
Alt-Shft-0  Unfold All
Alt-Shft-(1~8)  Uncollapse the Level (1~8)
Ctrl-BackSpace  Delete to start of word
Ctrl-Delete Delete to end of word
Ctrl-Shft-BackSpace Delete to start of line
Ctrl-Shft-Delete    Delete to end of line
Ctrl-U  Convert to lower case
Ctrl-Shft-U Convert to UPPER CASE
Ctrl-B  Go to matching brace
Ctrl-Shft-R Start to record /Stop recording the macro
Ctrl-Shft-P Play recorded macro
Ctrl-Q  Block comment/uncomment
Ctrl-Shft-Q Stream comment
Ctrl-Shft-T Copy current line to clipboard
Ctrl-P  Print
Alt-F4  Exit
Ctrl-I  Split Lines
Ctrl-J  Join Lines
Ctrl-Alt-R  Text Direction RTL
Ctrl-Alt-L  Text Direction LT
F1  About

The latest plugin is tidy2, which can be installed through Plugins>Plugin Manager>Show Plugin Manager.

I suggest editing config 1 and setting quote-marks: no, especially if you have script that makes use of quotes.

Also, tidying more than once can result in inserting ampersands the first time and then replacing the ampersands the second time. You may want to play with the config to get it to where you need it.

For JavaScript Formatting I use Notepad ++ JSMin Plugin.Quite Handy

This isn't quite the answer you were looking for, but it's the solution I came to when I had the same question.

[update - I'm using vscode now for everything. I think it works better in a lot of cases.]

I'm a pretty serious Notepad++ user, so don't take this the wrong way. I have started using NetBeans 8 to develop websites in addition to Notepad++ because you can set it to autoformat on save for all your languages, and there are a ton of configuration options for how the formatting looks, down to the most minute detail. You might look into it and find it is a worthy tool to use in conjunction with notepad++. It's also open source, completely free, and has a bunch of plugins and other useful things like automatically compiling Sass if you use that too. It's definitely not as quick as NP++ so it's not great for small edits, but it can be nice for a long coding session.

In my notepad++, it seems TextFX needs a perl environment to format HTML files. Tidy2 demands nothing so I think it's more handy.

If all you need is alignment, try the plugin called Code Alignment.

You can get it from the built-in plugin manager in Notepad++.

We can use the following shortcut in the latest version of notepad++ for formatting the code

Alt + Ctrl + Shift + B

In Plugins > Plugin Admin > Search 'XML Tools' > Install.

The window will restart and install XML Tools under plugins.

Open your file and click Ctrl + Alt + Shift + B

No. Notepad++ can't format by itself. Formatting can easily be accomplished in many IDEs like Eclipse, NetBeans, Visual Studio [Code].

Another Potential Solution

Okay, so it's been 12 years since this question was asked. I think that I've found a another acceptable solution, that is perhaps better for formatting files, using Prettier.

What is Prettier?

Prettier is described as: "an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the maximum line length into account, wrapping code when necessary."

Prettier Supports the Following Languages

HTML
CSS, Less, and SCSS
JavaScript
TypeScript
JSX, Angular, Vue
JSON, Markdown, YAML

And a few others.

If You Want to Use Other Languages, You Can Either Use:

Plugins made by the community to Prettier, which allow support for other formats such: Java, Rust, PHP, SQL, and others.
Non-Prettier formatters supporting other languages such as clang-format (npm version) (C / C++ / Java / JavaScript / JSON / Objective-C / Protobuf / C#), or Black (Python).

How To Install

You're going to need to install Node.js for this tutorial.

Note: There may be other work arounds for using the subsequent mentioned software without using Node.js. But to keep this tutorial simple and the fact that Node.js already carries widespread familiarity among developers, I'm going to be using this software without explaining how to install it.

After installing Node.js, install prettier globally to your system, allowing yourself to run prettier anywhere from the command line.

# NPM is the package manager used by Node.js
# And --global allows you to use prettier anywhere on your local computer.

npm install --global prettier

# To install other plugins (example):
npm install --g prettier-plugin-rust prettier-plugin-java

# To Install clang-format using NPM
npm install -g clang-format

# Usage Examples
prettier --write jquery-min.js # Formatting a JavaScript file
clang-format -i Test.cpp # Formatting C++ file

On Notepad++, install a plugin called NppExec from Menu> Plugins Admin...> Available> NppExec.
You can now run NppExec by either pressing F6 or by clicking Menu > Plugins > NppExec > Execute NppExec Script...
Now you should have a window pop up, giving you the option of executing a command.
You can either use prettier on a (1) specific file or (2) all files in a folder or (3) all files in a directory recursively.
You can always reload a file after it's better overwritten by Prettier using Ctrl+R, and enabling the following setting: Menu > MISC. > Update silently.

Commands and Screenshots of NppExec + Prettier.

REM Using Prettier on Current File (use cmd or powershell /c)
cmd /c prettier --write "$(FULL_CURRENT_PATH)"

REM Using Prettier on Current Folder (a single asterisk)
pwsh /c prettier --write "$(CURRENT_DIRECTORY)\*"

REM Using Prettier on Current Directory Recursively (double asterisk)
pwsh /c prettier --write "$(CURRENT_DIRECTORY)\**"

Install NppExec Plugin

Formatting code in Notepad++

Running NppExec Plugin

Formatting code in Notepad++

Executing Commands on NppExec

Formatting code in Notepad++

NPP+ v7.9.1 with the latest version of XMLTools can't format exported VBA code from Office 2016/2019 Word. It puts all the code on the same line since it strips the CRLF out. Moreover, when you enable "auto validation" it errors out on the first VBA line that is, Attribute VB_Name = "The VBA module name". So any of the xml tool validations apparently can't be used for VBA validation.