How to Move Wix Blog to Substack

Step-by-step guide to move your Wix blog to Substack. Export your archive, create a publication, connect it to API Substack, and republish as a Substack newsletter.

Moving from Wix to Substack means turning a blog archive into an owned email newsletter - with a public Substack home page and posts that arrive in readers’ inboxes.

Why sync your Wix blog to Substack?

When you sync your Wix blog from your website to Substack, the same posts reach Substack readers and email subscribers. That extra channel brings additional traffic and leads without replacing your original site.

Keep publishing on your site and let API Substack mirror articles to Substack automatically. You grow an owned newsletter audience while your site keeps ranking and converting visitors into leads.

How API Substack helps the move

API Substack is the unofficial posting API for Substack authors. After you create a Substack publication, you connect it to API Substack and republish your archive as drafts/posts - then keep shipping new issues without living in the browser editor.

• Register on API Substack and generate an API key
• Connect your Substack publication (publication URL + `substack.sid` session cookie)
• Create drafts, publish now, or schedule posts from API, CLI, or MCP
• Turn the migration queue into a repeatable newsletter workflow

In practice: export from Wix → create Substack → connect the publication to API Substack → republish cleaned posts → keep writing as a Substack newsletter.

Step 1 - Export from Wix

1. In Wix Blog, open each post or use available export/backup options for your plan.
2. Copy post HTML into Markdown/docs if no full XML export exists.
3. Export contacts from Wix CRM / Ascend if you collected emails.
4. Screenshot key landing pages you want to recreate as Substack About/Welcome posts.

Step 2 - Create your Substack publication

1. Create a publication at Substack and choose your name/URL
2. Write About / Welcome posts so new subscribers understand the move
3. Import your subscriber CSV in Substack (where you legally have consent)
4. Optionally connect a custom domain in Substack settings

Step 3 - Connect the publication to API Substack

1. Register on API Substack and start your key
2. Set your publication URL (example: `https://yourname.substack.com`)
3. Copy the browser cookie `substack.sid` while signed into Substack (DevTools → Application → Cookies)
4. Store the API key + cookie in your CLI, HTTP client, or Substack API MCP

Step 4 - Republish Wix posts to Substack

1. Clean each post (title, subtitle, body, images, tags)
2. Create a draft on Substack via API Substack (`create_post` / draft flows)
3. Review the draft in Substack if the piece is sensitive or heavily formatted
4. Publish or schedule - work oldest→newest or ship a “best of” first
5. Announce the move to remaining Wix readers with the Substack URL

For non-technical authors, install the MCP into Claude, Cursor, or Codex and ask the agent to draft/publish. For developers, use the Python client / CLI or raw HTTP. See How to post to Substack via API.

Corner cases

• Wix does not always give a clean portable blog export - budget copy-paste time.
• SEO lives on your Wix domain - keep redirects if you used a custom domain.
• Forms and apps stay on Wix only editorial content moves to Substack.

• `substack.sid` expires - refresh it when you get 401/403
• API Substack does not replace Substack’s own subscriber CSV import - connect the publication, then republish content
• Image upload and Notes are not the focus of the posting API - optimize for newsletter posts
• This is unofficial and not affiliated with Substack - keep browser login as backup

After the move

Once the Wix archive is on Substack, keep using API Substack as your publish rail: draft tomorrow’s issue, schedule the week, or let an AI agent post through MCP. Your blog becomes a Substack newsletter you actually control.