Use Chrome autofill for addresses and cards, a password manager for logins, and an AI agent for everything else — custom questions, long applications and forms whose fields autofill does not recognise.
Option 1: Chrome autofill
Chrome saves addresses, phone numbers and payment methods and offers them on fields it recognises. It is instant and private, but it only knows standard fields and often fails on custom forms.
Option 2: Password managers
Password managers fill logins and, in many cases, identities and cards. They are the right tool for credentials — no AI agent should ever type your passwords.
Option 3: An AI agent
An agent reads the form’s labels and types what you tell it into the matching fields, including free-text answers and dropdowns. With Hark:
- Open the form and press Alt+Shift+H.
- Switch to Agent.
- Type: “Fill in this form with my details: …”
- Watch the fields fill, then approve the submit step.
See it in action on the fill out forms page.
Which to use when
| Form | Best tool |
|---|---|
| Checkout address | Chrome autofill |
| Login | Password manager |
| Registration with custom questions | AI agent |
| Job or rental application | AI agent, then careful review |
| The same form 500 times | A scripted automation tool |
Staying safe
Never paste passwords, one-time codes or card numbers into an AI tool. Review every filled form before submitting; an agent that asks for approval makes that the default.