Prepare the file
Use a CSV with a header row. The only required column is the email address. Extra columns can map to first name, last name, locale, or any custom field.
Upload and map
Under Audience → Imports, upload the file. We detect the delimiter and suggest a mapping for each column; adjust anything that is wrong. You can also:
- add every imported contact to an audience,
- tag them (for example
imported-2026-10), - choose whether existing contacts are updated or left alone.
Consent
Only import people who agreed to hear from you. Contacts you import are marked as subscribed; if you are not sure they opted in, run a re-permission campaign first or use a signup form with double opt-in instead.
After the import
Rows with problems (an invalid email, a value that does not fit a custom field) are skipped and listed in a downloadable error file, so you can fix them and import again.