Every step below is from an official source
Switch from Dashlane to Bitwarden
What to do at Dashlane 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 Dashlane, before you leave
Export to CSV from the Dashlane web appBefore
In the web app, open the Vault menu, select Settings, then Export data, then Export to CSV. Dashlane downloads a ZIP file to your computer.
Export your Dashlane data to a CSVDashlane. ReviewedKnow what a CSV export leaves outBefore
Passkeys, attachments on Secure Notes, and 2FA tokens can't be exported to a CSV file.
Export your Dashlane data to a CSVDashlane. ReviewedMove passkeys with Credential Exchange insteadBefore
Passkeys can move between Dashlane and Apple Passwords, 1Password, Bitwarden and some other apps. They can't go in CSV files or DASH backups.
Can I share, import, export, or back up passkeys with Dashlane?Dashlane. ReviewedDelete the CSV files when you finishAfter
CSV files aren't encrypted and others can read them. Dashlane recommends deleting the CSV file from your device when you are done.
Export your Dashlane dataDashlane. 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 Dashlane 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.