Every step below is from an official source
Switch from Bitwarden to LastPass
What to do at Bitwarden 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 Bitwarden, before you leave
Export from the Bitwarden web appBefore
In the web app, select Tools, then Export, and choose what to export. Pick .json, .csv, encrypted .json, or .zip with attachments, then confirm with your master password or an email code.
Export vault dataBitwarden Help Center. ReviewedKnow what Bitwarden exports leave outBefore
No export format includes trash items or Sends. Individual vault exports do not include items owned by an organization.
Export vault dataBitwarden Help Center. ReviewedUse .json to keep cards, identities and passkeysBefore
Only .json exports include cards, identities, stored passkeys and SSH keys.
Export vault dataBitwarden Help Center. ReviewedProtect and delete an unencrypted exportAfter
Unless the export is encrypted, don't store or send it over insecure channels like email. Delete the file right after use.
Export vault dataBitwarden Help Center. Reviewed
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 Bitwarden 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.