What is the best way to resize an image for mobile site optimization?

I've been struggling with resizing an image by its width for different mobile devices even after trying to search on Google. Here's what I have attempted:

CSS:

img.test {
    width: 100%;
    height: auto;
}

HTML:

<html>
    <head>
        <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
        <meta content="width=device-width; initial-scale=1.0; maximum-scale=1.0;   user-scalable=0;" name="viewport">
        <link rel="stylesheet" href="../includes/style.css">
    </head>
    <img class="test"  src="../includes/foo.jpg">

Despite my efforts, the image still loads in its original scaling. As a newbie in CSS and HTML, any guidance would be appreciated!

Edit:

Thank you for the responses. Here is an updated version that now seems to work.

HTML:

   <html>
    <head>
        <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
        <meta content="width=device-width; initial-scale=1.0; maximum-scale=1.0;  user-scalable=0;" name="viewport">
        <link rel="stylesheet" href="../includes/style.css">
    </head>
    <body width = "device-width">
        <img class="test"  src="../includes/buoy_map.jpg">
    </body>
htmlcssimage

Answer №1

img {
  width: 100%;
}

This will ensure that the image fills its parent container completely.

Answer №2

img
{
    width: 100%;
    min-width: 300px;
    height: auto;
}

Answer №3

When utilizing bootstrap 3, simply include the img-responsive class to your img tag

<img class="img-responsive" src="...">

If you are using bootstrap 4, apply the img-fluid class to your img tag

<img class="img-fluid" src="...">

This will ensure that the image has properties such as: max-width: 100%, height: auto, and display: block

Answer №4

To adjust image size for mobile display, apply the following CSS code

object-fit: scale-down; max-width: 100%

Answer №5

In my experience, I found that the ideal solution was to include the following in the image css: max-width:100%; and avoid setting the image width and height in the html code. By doing this, the width of the image will automatically adjust to fit the device screen while maintaining the correct aspect ratio. This approach prevents any distortion in the height of the image.

Answer №6

The css you're using doesn't seem to be having an effect because the parent element lacks a defined width (and the body is also missing).

Another approach would be to provide pre-scaled images. Take for example , which delivers images that are already scaled down based on the device they are being viewed on.

Answer №7

img.thatimage
{
    max-width: 100%;
    min-width: 300px;
    height: auto;
}

/* The style for a specific image can be set like this */
<img class="thatimage" src="your_image_path" alt="" style="">

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