How Does a Website Already Know My Email?
A saved email may come from your browser, your account, an earlier visit or a checkout company. Here is how to check.
The simple answer
You open a checkout page and your email is already in the box. Your browser may have filled it in. The site may also remember a login, an earlier visit or details held by its checkout provider.
Try the page while logged out, with browser autofill turned off. If the email still appears, ask the website where it got the address.
What to check
Find out who filled the box.
The same visible result can have different causes. A browser test can help narrow them down. The company can explain whether a supplier provided the address.
What to do next
People also ask
Does an email appearing in a form prove that sites shared it?
Several things can fill a form, including your own browser. Check autofill and your login first.
What is a hashed email?
It is an email address converted into a code. Companies can compare these codes to match accounts or visits.
How can I stop my browser filling in my email?
Open the browser’s autofill settings and remove the saved address or turn off autofill.
Guide reviewed on 5 September 2026.
Sources
See the company reviews and dates.
How many trackers run on your pages? Does your privacy policy name them? Can you answer a data-rights email? If you don't know, we can help you find out.
Talk to Meridian Bridge Strategy →Your personal data belongs to you. You can ask a company what it holds and how to raise a privacy request. The response depends on the applicable duties, identity checks and any retention requirements.
Get the template email →The public report shows what we found in the company records. Check the observation dates and method.