Every step below is from an official source
Switch from Apple Passwords (iCloud Keychain) to Google Password Manager
What to do at Apple Passwords (iCloud Keychain) before you leave, what Google Password Manager needs when you join, and everything else the switch touches. Your full plan is built in your browser and stays there.
Official sources reviewed . How we review sources
At Apple Passwords (iCloud Keychain), before you leave
Export all passwords to a CSV file on MacBefore
In the Passwords app on your Mac, choose File > Export All Passwords to File, click Export Passwords, then choose where to save it.
Export passwords from your Mac to a fileApple. ReviewedKnow which passwords can't be exportedBefore
You can't export Wi-Fi passwords, passwords shared with a group you didn't create, or access to Sign in with Apple accounts.
Export passwords from your Mac to a fileApple. ReviewedTreat the exported file as unprotectedDuring
Exported passwords are not encrypted. Anyone who can open the file can see them.
Export passwords from your Mac to a fileApple. ReviewedDelete the file after importing elsewhereAfter
Once the passwords are in your new password manager, delete the file you exported.
Export passwords from your Mac to a fileApple. Reviewed
At Google Password Manager, when you join
Import a CSV file at passwords.google.comDuring
Go to passwords.google.com, select Settings, then Import, then Select File. Choose your file and select Import. Only .CSV files can be imported.
Import passwords to your Google Account - Google Account HelpGoogle. ReviewedImport up to 3,000 passwords at a timeBefore
You can import 3,000 passwords at a time. Your Google Account can store up to 10,000 passwords.
Import passwords to your Google Account - Google Account HelpGoogle. ReviewedDelete the CSV file after importingAfter
After the import, delete the .CSV password file. Otherwise anyone with access to the device can open it.
Import passwords to your Google Account - Google Account HelpGoogle. ReviewedSearch by site name for missing passwordsAfter
Not all app and site names move into the right field. If you can't find an imported password, search for the app or site name.
Then: everything else the switch affects
The steps above are what Apple Passwords (iCloud Keychain) and Google Password Manager say. Your full checklist adds the accounts, codes, payments and devices that depend on your password manager, in a safe order. It's built from your answers, in your browser.