Verify your Kit (ConvertKit) subscriber list
Kit, formerly ConvertKit, has no SimpleVerifier connector. For a creator list the round trip is: export subscribers, verify the CSV, import the results back with a tag. One Kit rule shapes the whole job: an import never reactivates someone who unsubscribed.
The workflow
- In Kit, open Subscribers. To limit the file, open a segment from the right sidebar, or click Status and choose Confirmed subscriber.
- Tick the checkbox at the top of the list and click Select all, so every subscriber is selected, not only the page. If the link still reads Select all, only the current page is chosen. Then three-dot menu > Export.
- Download the file from the link Kit emails you or from the notification panel. Links expire after five days.
- Upload the CSV on the verify page, signed in; the first 100 checks are free. The email column is found by its header or contents and every other column is kept.
- When the job finishes, download the valid, risky and invalid files. Each keeps all of your original columns.
- On the Subscribers page click Add Subscribers > Import CSV, drop in the invalid file, map the columns and choose a tag such as invalid-email. Kit's default tag is named Imported plus the date; renaming it makes the result easier to find.
- Unsubscribe or exclude that tag from broadcasts and sequences. Kit's importer replaces existing field values with whatever is in the file, blanks included, so remove columns you do not want to touch before you import.
Menu names follow Kit (ConvertKit)’s own help articles, checked 12 Nov 2026: export subscribers, import a subscriber list. Vendors rename menus, so trust what you see on screen if it differs. SimpleVerifier is not a Kit (ConvertKit) partner and has no Kit (ConvertKit) connector.
Columns to map
- Email address; every row needs one, and Kit stops reading at the first row without it.
- Custom fields use the field's API key as the column header, not its display name.
- A tags column labelled as a comma-separated list of tags, if you want to apply tags from the file.
What to do with risky and catch-all results
Risky addresses on a creator list are usually catch-all business domains or role addresses. Tag them risky and send your next broadcast to them last, or move them to a short reconfirmation email. Do not delete them on the strength of a risky flag alone.
What people use it for
- Clean a list before a launch or paid-newsletter push after months without sending.
- Check a lead-magnet list that grew from a giveaway, where typos and throwaway addresses are common.
- Cut dead subscribers before moving to a Kit plan tier priced by subscriber count.
Using the result
Each address comes back valid (the mail server confirmed the mailbox), risky (delivery could not be confirmed: a catch-all domain, a role address such as info@, or a provider that hides mailbox status) or invalid (it will bounce, or it is a throwaway address).
Full endpoint reference, error codes and an OpenAPI file are in the API docs. For lists of thousands of addresses, upload a CSV on the verify page instead.
Run your 100 free checks on one list before you switch anything
Export one list’s addresses as a CSV and upload it: the first 100 are checked free in the dashboard, no card needed. Compare the results with what you use now, then decide. Nothing in Kit (ConvertKit) changes until you import a file back.
Common questions
- Which plans include API access for Kit (ConvertKit)?
- API access comes with Pro, Business and Agency, listed on the pricing page; Starter covers CSV verification only. A key on a plan without API access gets a 402 that says so. Each key can make 120 calls a minute.
- Does SimpleVerifier plug into Kit?
- No. There is no connector; use the CSV export and import above.
- Can the import bring back people who unsubscribed?
- No. Kit does not reactivate previously unsubscribed people through CSV import, which also means a verification import cannot accidentally resubscribe them.