Test the extension
Use these sample forms to see Subaddressify in action. Each form simulates a real signup scenario — watch the extension auto-fill a unique sub-address as you click into the email fields.
How to use this page
Install the extension
Add Subaddressify to Chrome from the Web Store and configure your base email in the extension settings.
Click into an email field
Focus any email input below. If auto-fill is on, the extension injects your sub-address automatically.
Or use the popup
Open the extension popup, then click Insert to fill the focused field — or Copy to paste it yourself.
Submit the form
The success screen shows exactly which address was used, so you can verify the alias is correct.
Single email field — the simplest case
Stay in the loop
Get product updates and early access.
Full registration form with password field
Create your account
Start your 14-day free trial. No card required.
Login form — extension should skip this
Sign in
Welcome back.
These forms are for demonstration only — nothing is stored or submitted anywhere. The sub-addresses generated here are based on this site's hostname, so they'll look like you+2026-05-02-subaddressify-co-uk@domain.com. On any real website the hostname changes, giving you a unique alias per site.