Every step below is from an official source
Switch from LastPass to Bitwarden
What to do at LastPass before you leave, what Bitwarden 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 LastPass, before you leave
Export your vault from the LastPass websiteBefore
Log in on the LastPass website, open the Account tab, then go to Fix a problem yourself > Export vault items. In the previous layout, go to Advanced Options > Export.
How do I export my vault data while logged in via the LastPass website?LastPass. ReviewedConfirm the export from the verification emailDuring
LastPass emails you a Verify export message. Click Continue export in that email within 10 minutes, then go back to your vault and run the export again.
How do I export my vault data while logged in via the LastPass website?LastPass. ReviewedAllow pop-ups so the CSV file downloadsDuring
After the export, your sites and secure notes show in a browser page. If LastPass pop-ups are not blocked, a CSV file with your vault data also downloads.
How do I export my vault data while logged in via the LastPass website?LastPass. ReviewedNote that TOTP codes are not exportedBefore
LastPass does not support exporting the one-time passcodes (TOTP) you generate inside your vault.
How do I export my vault data while logged in via the LastPass website?LastPass. Reviewed
At Bitwarden, when you join
Import from LastPass, 1Password, Chrome and moreDuring
Bitwarden supports imports from common password managers, including LastPass, 1Password, Firefox, Chrome, Edge, Chromium, Password Safe and other Bitwarden vaults.
Import to your vault or collectionsBitwarden Help Center. ReviewedImport LastPass directly, then add attachments by handDuring
Bitwarden's browser extensions and desktop apps can import your individual LastPass vault directly, with no file upload. File attachments and trash must be uploaded to your vault by hand.
Import from LastPassBitwarden. ReviewedSplit files with more than 40,000 itemsBefore
An imported file can contain up to 40,000 items. If your file is too large, split it into smaller files and import each one.
Import to your vault or collectionsBitwarden Help Center. ReviewedDelete the export file after importingAfter
Once your data is in Bitwarden, delete the exported data file from your computer.
Import to your vault or collectionsBitwarden Help Center. Reviewed
Then: everything else the switch affects
The steps above are what LastPass and Bitwarden 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.