It is a very practical function but is it safe to auto-fill forms in the browser? Does this function respect privacy? No.
Surely when this utility first worked in your browser, you really appreciated it. Autocomplete forms is very useful to save writing data like your name or your email. But by giving up control of your data to the browser, you are putting your privacy at risk.
A priori it might seem that one can control the data that is shared simply by reading the form. But the reality is that many websites take advantage of the function of auto-completing forms to obtain data without your consent.
Hidden fields, the problem of auto-completing forms
This function stores all the data that you are adding to forms, to use them later on other websites. The problem is that you don’t always have control over the data you transfer to each website. Some pages use hidden fields (theoretically visible but off-screen) to get some data without you knowing, as they’ve discovered in GHacks.
This way, if for example you put your home address on a form from a reliable site, then that address can end up reaching other websites where you fill out a form with a hidden postal address field.
You can check what data you are giving yourself by looking at the code on the page, but in the end it is much easier and faster to disable the form auto-complete function and fill it out by yourself.
How to stop auto-completing forms in Chrome
Disabling this feature is very important to protect your privacy, and very easy. Just go to Chrome settings, and below select show advanced settings. Then go to the passwords and forms section and turn off the auto-complete feature.