Bootstrap Input Sizing

Input Sizing in Forms

Set the heights of input elements using classes like .input-lg and .input-sm.

Set the widths of elements using grid column classes like .col-lg-*and .col-sm-*.

<form>
  <div class="form-group">
    <label for="inputsm">Small input</label>
    <input class="form-control input-sm" id="inputsm" type="text">
  </div>
   <div class="form-group">
    <label for="inputdefault">Default input</label>
    <input class="form-control" id="inputdefault" type="text">
  </div>
  <div class="form-group">
    <label for="inputlg">Large input</label>
    <input class="form-control input-lg" id="inputlg" type="text">
  </div>
</form>

You can quickly size labels and form controls within a Horizontal form by adding .form-group-* to the <div class="form-group"> element:

<div class="form-group form-group-lg">

You can also quickly size all inputs and other elements inside an .input-group with the .input-group-sm or .input-group-lg classes:

<div class="input-group input-group-lg">

Column Sizing

col-xs-2

col-xs-3

col-xs-4

The following examples shows input elements with different widths using different .col-xs-* classes:

<div class="form-group row">
  <div class="col-xs-2">
    <label for="ex1">col-xs-2</label>
    <input class="form-control" id="ex1" type="text">
  </div>
  <div class="col-xs-3">
    <label for="ex2">col-xs-3</label>
    <input class="form-control" id="ex2" type="text">
  </div>
  <div class="col-xs-4">
    <label for="ex3">col-xs-4</label>
    <input class="form-control" id="ex3" type="text">
  </div>
</div>

Help Text

Use the .help-block class to add a block level help text in forms:

<div class="form-group">
  <label for="pwd">Password:</label>
  <input type="password" class="form-control" id="pwd" placeholder="Enter password">
  <span class="help-block">This is some help text...</span>
</div>