Bootstrap 4 align navbar items to the right

Bootstrap 4 has many different ways to align navbar items. float-right won't work because the navbar is now flexbox.

You can use mr-auto for auto right margin on the 1st (left) navbar-nav. Alternatively, ml-auto could be used on the 2nd (right) navbar-nav , or if you just have a single navbar-nav.

<nav class="navbar navbar-expand-md navbar-light bg-light">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
        <ul class="navbar-nav mr-auto">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Features</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Pricing</a>
            </li>
        </ul>
        <ul class="navbar-nav">
            <li class="nav-item">
                <a class="nav-link" href="#">Login</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Register</a>
            </li>
        </ul>
    </div>
</nav>

https://codeply.com/go/P0G393rzfm

There are also flexbox utils. For example use justify-content-end on the collapse menu:

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Brand</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse justify-content-end" id="navbarNav">
      <ul class="navbar-nav">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Contact</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Pricing</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Download</a>
        </li>
      </ul>
    </div>
  </div>
</nav>

Or when you have 2 navbar-navs, use justify-content-between in navbar-collapse would work to even the space between the navbar-navs:

 <div class="navbar-collapse collapse justify-content-between">
     <ul class="navbar-nav mr-auto">
               ..
     </ul>
     <ul class="navbar-nav">
           ..
     </ul>
 </div>

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Update for Bootstrap 4.0 and newer

As of Bootstrap 4 beta, ml-auto will still work to push items to the right. Just be aware the the navbar-toggleable- classes have changed to navbar-expand-*

Updated navbar right for Bootstrap 4

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Another frequent Bootstrap 4 Navbar right alignment scenario includes a button on the right that remains outside the mobile collapse nav so that it is always shown at all widths.

Right align button that is always visible

Related: Bootstrap NavBar with left, center or right aligned items

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Update for Bootstrap 5 (see this question). ml-auto has been replaced with ms-auto to represent start instead of left.

In my case, I wanted just one set of navigation buttons / options and found that this will work:

<div class="collapse navbar-collapse justify-content-end" id="navbarCollapse">
  <ul class="navbar-nav">
    <li class="nav-item">
      <a class="nav-link" href="#">Sign Out</a>
    </li>
  </ul>
</div>

So, you will add justify-content-end to the div and omit mr-auto on the list.

Here is a working example.

For those who is still struggling with this issue in BS4 simply try below code -

<ul class="navbar-nav ml-auto">