Increasing the size of checkbox in HTML

Not in an easy cross browser way.

You would get the most flexibility replacing it with a control that utilises JavaScript and CSS. Use a standard checkbox as a fallback.

These days, with the :checked pseudo selector, you can make a label element to do it as well.

One way I changed the checkbox size is by scaling it with CSS:

input[type=checkbox] {
    transform: scale(2);
    -ms-transform: scale(2);
    -webkit-transform: scale(2);
    padding: 10px;
}

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