Every step below is from an official source
Switch from Proton Pass to Google Password Manager
What to do at Proton Pass 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 Proton Pass, before you leave
Export from Proton Pass settingsBefore
In the browser extension, web app or Windows app, open settings with the gear icon, then click the Export tab.
How to export from Proton PassProton Support. ReviewedUse a computer, not the mobile appBefore
You can't export data from the Proton Pass mobile apps.
How to export from Proton PassProton Support. ReviewedEncrypt the export if you store or send itDuring
You can export a ZIP with a PGP-encrypted JSON file, an unencrypted ZIP, or a CSV file. Proton recommends encrypting the file if you will keep it as a backup or transfer it.
How to export from Proton PassProton Support. 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 Proton Pass 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.