Custom Domains

Serve your site from a custom subdomain instead of sidian.app/s/your-slug.

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Setup

1. Add the domain in Sidian

1. Open your site → Settings tab
2. Under Custom domain, enter your domain (e.g. notes.yourdomain.com)
3. Click Save

2. Add a DNS record

At your DNS provider (Cloudflare, Namecheap, etc.), add a CNAME record:

Type	Name	Value
CNAME	notes	sidian.app

For a root domain (e.g. yourdomain.com), use an ALIAS or ANAME record pointing to sidian.app instead — not all DNS providers support this.

3. Wait for propagation

DNS changes typically take a few minutes to propagate. Once active, your site will be served at https://notes.yourdomain.com.

SSL is handled automatically via Let's Encrypt — no certificate setup required.

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Removing a custom domain

Clear the custom domain field in settings and save. The site reverts to its sidian.app/s/slug URL immediately.