size HTML attribute

The size attribute defines the width of the <input> and the height of the <select> element. For an input element, it defines the number of characters that the user agent allows the user to see when editing the value. For a select element, it defines the number of options that should be shown to the user. This must be a valid non-negative integer greater than zero.

If no size is specified, or an invalid value is specified, the input has no size declared, and the form control will be the default width based on the user agent. If CSS targets the element with properties impacting the width, CSS takes precedence.

The size attribute has no impact on constraint validation.

Try it

<label for="firstName">First Name:</label>
<input id="firstName" name="firstName" type="text" size="10">

<label for="lastName">Last Name:</label>
<input id="lastName" name="lastName" type="text" size="20">

<label for="fruit">Favorite fruit:</label>
<select id="fruit" name="fruit" size="2">
  <option>Orange</option>
  <option>Banana</option>
  <option>Apple</option>
</select>
label {
  display: block;
  margin-top: 1rem;
}

Examples

By adding size on some input types, the width of the input can be controlled. Adding size on a select changes the height, defining how many options are visible in the closed state.

html
<label for="fruit">Enter a fruit</label>
<input type="text" size="15" id="fruit" />
<label for="vegetable">Enter a vegetable</label>
<input type="text" id="vegetable" />

<select name="fruits" size="5">
  <option>banana</option>
  <option>cherry</option>
  <option>strawberry</option>
  <option>durian</option>
  <option>blueberry</option>
</select>

<select name="vegetables" size="5">
  <option>carrot</option>
  <option>cucumber</option>
  <option>cauliflower</option>
  <option>celery</option>
  <option>collard greens</option>
</select>

Specifications

Specification
HTML
# attr-select-size
HTML
# attr-input-size

Browser compatibility

html.elements.select.size

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
size
Chrome – Full support
Chrome 1 (Release date: 2008-12-11)
footnote Full support
Edge – Full support
Edge 12 (Release date: 2015-07-29)
footnote Full support
Firefox – Full support
Firefox 1 (Release date: 2004-11-09)
footnote Full support
Opera – Full support
Opera 15 (Release date: 2013-07-02)
footnote Full support
Safari – Full support
Safari 3 (Release date: 2007-10-26)
footnote Full support
Chrome Android – Full support
Chrome Android 142 (Release date: 2025-10-28)
footnote Full support
Firefox for Android – Full support
Firefox for Android 4 (Release date: 2011-03-29)
footnote Full support
Opera Android – Full support
Opera Android 93 (Release date: 2025-11-25)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – Full support
WebView Android 142 (Release date: 2025-10-28)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support

html.elements.input.size

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
size
Chrome – Full support
Chrome 1 (Release date: 2008-12-11)
footnote Full support
Edge – Full support
Edge 12 (Release date: 2015-07-29)
footnote Full support
Firefox – Full support
Firefox 1 (Release date: 2004-11-09)
footnote Full support
Opera – Full support
Opera 12.1 (Release date: 2012-11-20)
footnote Full support
Safari – Full support
Safari 1 (Release date: 2003-06-23)
footnote Full support
Chrome Android – Full support
Chrome Android 18 (Release date: 2012-06-27)
footnote Full support
Firefox for Android – Full support
Firefox for Android 4 (Release date: 2011-03-29)
footnote Full support
Opera Android – Full support
Opera Android 14 (Release date: 2013-05-21)
footnote Full support
Safari on iOS – Full support
Safari on iOS 1 (Release date: 2007-06-29)
footnote Full support
Samsung Internet – Full support
Samsung Internet 1 (Release date: 2013-04-27)
footnote Full support
WebView Android – Full support
WebView Android 4.4 (Release date: 2013-12-09)
footnote Full support
WebView on iOS – Full support
WebView on iOS 1 (Release date: 2007-06-29)
footnote Full support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also