Detect if a browser in a mobile device (iOS/Android phone/tablet) is used

Css Problem Overview

Is there a way to detect if a handheld browser is used (iOS/Android phone/tablet)?

I tried this with the goal to make an element half as wide in a browser on a handheld device but it doesn't make a difference.

width: 600px;
@media handheld { width: 300px; }

Can it be done and if so how?

edit: From the referred page in jmaes' answer I used

@media only screen and (max-device-width: 480px).

Css Solutions

Solution 1 - Css

Update (June 2016): I now try to support touch and mouse input on every resolution, since the device landscape is slowly blurring the lines between what things are and aren't touch devices. iPad Pros are touch-only with the resolution of a 13" laptop. Windows laptops now frequently come with touch screens.

Other similar SO answers (see other answer on this question) might have different ways to try to figure out what sort of device the user is using, but none of them are fool-proof. I encourage you to check those answers out if you absolutely need to try to determine the device.

iPhones, for one, ignore the handheld query (Source). And I wouldn't be surprised if other smartphones do, too, for similar reasons.

The current best way that I use to detect a mobile device is to know its width and use the corresponding media query to catch it. That link there lists some popular ones. A quick Google search would yield you any others you might need, I'm sure.

For more iPhone-specific ones (such as Retina display), check out that first link I posted.

Solution 2 - Css

Here's how I did it:

@media (pointer:none), (pointer:coarse) {
}

Based on https://stackoverflow.com/a/42835826/1365066

Solution 3 - Css

Don't detect mobile devices, go for stationary ones instead.

Nowadays (2016) there is a way to detect dots per inch/cm/px that seems to work in most modern browsers (see http://caniuse.com/#feat=css-media-resolution). I needed a method to distinguish between a relatively small screen, orientation didn't matter, and a stationary computer monitor.

Because many mobile browsers don't support this, one can write the general css code for all cases and use this exception for large screens:

@media (max-resolution: 1dppx) {
	/* ... */
}

Both Windows XP and 7 have the default setting of 1 dot per pixel (or 96dpi). I don't know about other operating systems, but this works really well for my needs.

Edit: dppx doesn't seem to work in Internet Explorer.. use (96)dpi instead.

Solution 4 - Css

Detecting mobile devices

There's no single approach that's truly foolproof. The best bet is to mix and match a variety of tricks as needed, to increase the chances of successfully detecting a wider range of handheld devices. See the link above for a few different options.

Solution 5 - Css

I believe that a much more reliable way to detect mobile devices is to look at the navigator.userAgent string. For example, on my iPhone the user agent string is:

> Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_2 like Mac OS X) AppleWebKit/603.2.4 (KHTML, like Gecko) Version/10.0 Mobile/14F89 Safari/602.1

Note that this string contains two telltale keywords: iPhone and Mobile. Other user agent strings for devices that I don't have are provided at:

https://deviceatlas.com/blog/list-of-user-agent-strings

Using this string, I set a JavaScript Boolean variable bMobile on my website to either true or false using the following code:

var bMobile =   // will be true if running on a mobile device
  navigator.userAgent.indexOf( "Mobile" ) !== -1 || 
  navigator.userAgent.indexOf( "iPhone" ) !== -1 || 
  navigator.userAgent.indexOf( "Android" ) !== -1 || 
  navigator.userAgent.indexOf( "Windows Phone" ) !== -1 ;

Solution 6 - Css

Many mobile devices have resolutions so high that it's hard to distinguish between them and much larger screens. There are two ways to deal with this problem:

Use the following HTML code to scale the pixels (grouping smaller pixels into groups the size of the unit pixel - 96dpi, so px units will have the same physical size on all screens). Note that this will affect the scale of pretty much everything in your website, but this is generally the way to go when making sites mobile-friendly.

<meta name="viewport" content="width=device-width, initial-scale=1">

Alternatively, measuring the screen width in @media queries using cm instead of px units can tell you if you're dealing with a physically small screen regardless of resolution.

Solution 7 - Css

CSS Level 5 Media Queries are best for this

below code styles css for touch screen devices except old androids and windows touch screens because windows touch screens are hover-able devices with mouse pointer...

@media (hover: none) { /* css for touch screen devices except old androids and windows touch screens because windows touch screens are hover-able devices with mouse pointer... */ }

Solution 8 - Css

I know this is an old thread but I thought this might help someone:

Mobile devices have greater height than width, in contrary, computers have greater width than height. For example:

@media all and (max-width: 320px) and (min-height: 320px)

so that would have to be done for every width i guess.

Solution 9 - Css

Simple! Throw this at the like, bottom of your CSS file and this part of the CSS will be modified within a phone: -

/* ON A PHONE */
@media only screen and (max-width: 600px) { /* CSS HERE ONLY ON PHONE */ }

And voila!

Content Type	Original Author	Original Content on Stackoverflow
Question	ivavid	View Question on Stackoverflow
Solution 1 - Css	jamesplease	View Answer on Stackoverflow
Solution 2 - Css	GrayFace	View Answer on Stackoverflow
Solution 3 - Css	LGT	View Answer on Stackoverflow
Solution 4 - Css	Matt Coughlin	View Answer on Stackoverflow
Solution 5 - Css	Jesse Heines	View Answer on Stackoverflow
Solution 6 - Css	potato	View Answer on Stackoverflow
Solution 7 - Css	AbdurRAHMAN Ayyıldız	View Answer on Stackoverflow
Solution 8 - Css	m33x	View Answer on Stackoverflow
Solution 9 - Css	Broteen Das	View Answer on Stackoverflow