Every step below is from an official source
Switch from Google Password Manager to LastPass
What to do at Google Password Manager before you leave, what LastPass 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 Google Password Manager, before you leave
Export passwords from Chrome on a computerBefore
In Chrome, go to More > Passwords and autofill > Google Password Manager > Settings. Scroll to Export passwords and select Download file.
Delete the exported password fileAfter
If you don't delete the password file, anyone who uses the device can open it and see your passwords.
At LastPass, when you join
Use a generic CSV if your manager isn't supportedBefore
If LastPass's on-screen import steps don't support your current password manager, you may be able to import a generic CSV file. Check first that your current manager can export to CSV.
How do I import stored data into LastPass using a generic CSV file?LastPass. ReviewedMatch your CSV columns to the LastPass templateDuring
Column titles must match LastPass's sample template. The columns are url, username, password, extra, name, grouping, fav and totp.
How do I import stored data into LastPass using a generic CSV file?LastPass. ReviewedUse passive import if your manager can't exportDuring
Run LastPass alongside your old password manager. Visit each site, let the old manager fill in your login, then add it to LastPass.
Then: everything else the switch affects
The steps above are what Google Password Manager and LastPass 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.