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If you’re moving to LetterBucket from another platform, you can import your existing content and subscribers so you don’t have to start from scratch. Go to Settings → Advanced → Content Import to get started.

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Supported platforms

  • Substack
  • Beehiiv
  • Kit (formerly ConvertKit)
  • Ghost

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Importing from Substack

Substack offers the most complete import experience — you can bring over both your posts and your subscribers.

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Option 1: Full import (posts + subscribers)

  1. Export your data from Substack: go to your Substack dashboard, open Settings → Exports, and request a full export. Substack will email you a ZIP file.
  2. In LetterBucket, select Substack and upload the ZIP file.
  3. LetterBucket will extract your posts and subscribers from the archive.
  4. You’ll see a list of posts ready for import. Review them, select which ones to import, and confirm.
  5. The import runs in the background — you’ll see a progress indicator. Once complete, you’ll see a summary of what was imported.

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Option 2: Subscribers only

If you only want to import your subscriber list (not your posts):
  1. Export your subscribers from Substack as a CSV file.
  2. Select Substack and choose the CSV subscribers only option.
  3. Upload the CSV file.
  4. Review the subscriber count and confirm the import.
If you want subscribers only, you can also use Settings → Subscribers → Add Subscribers and upload a CSV directly — this works for any platform, not just Substack.

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Importing from Beehiiv or Kit

For these platforms, select the corresponding option. The flow will guide you through exporting from the source platform and uploading the file to LetterBucket.

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Importing from Ghost

  1. Export your content from Ghost: go to Settings → Labs in your Ghost admin and click Export your content. This downloads a JSON file.
  2. In LetterBucket, select Ghost and upload the JSON file.
  3. Enter your Ghost site URL (e.g. https://yourblog.ghost.io). This is required — the URL is used to resolve image paths in your imported posts.
  4. Review the posts ready for import and confirm.
Both the JSON file and the Ghost site URL must be provided before you can proceed. The “Next” button remains disabled until both fields are filled.
Import formats and available data vary by platform. Posts are imported as drafts so you can review and edit them before publishing.

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After importing

  • Posts arrive as drafts. Review each one in the Posts section before publishing.
  • Subscribers are added to your list immediately and can be viewed in Subscribers.
  • Imported subscribers are not sent any emails automatically — no welcome email is triggered by an import.
Make sure your subscriber list only includes people who have explicitly opted in to receive emails from you. Importing unverified contacts can hurt your deliverability.