SEO Automation

Postlark generates all SEO essentials automatically when you publish a post.

What’s Automatic

Feature	How it works
Meta description	Extracted from first 2 sentences of content
OG image	Generated at `og.postlark.ai/{blog}/{post}.png`
JSON-LD	`BlogPosting` + `BreadcrumbList` schema
Canonical URL	Points to custom domain if configured
RSS feed	Available at `/rss.xml`
Sitemap	Available at `/sitemap.xml` (Starter+)
robots.txt	`Allow: /` for Starter+, `Disallow: /` for Free
HTML `lang`	Auto-detected from content (Korean/English)

Custom Meta

Override the auto-generated meta description:

{
  "title": "My Post",
  "content": "...",
  "meta": {
    "description": "My custom meta description",
    "og_image": "https://example.com/custom-og.png"
  }
}

Indexing Policy

Plan	robots.txt	Google indexing
Free (subdomain)	`Disallow: /`	Not indexed
Starter+ (custom domain)	`Allow: /`	Indexed

Free plan subdomains are intentionally noindex to protect the platform’s domain reputation.

AI Discoverability (llms.txt)

Every Postlark blog automatically generates llms.txt — a machine-readable index that AI agents (ChatGPT, Claude, Perplexity) can use to discover and cite your content.

Resource	URL	Plan
Blog index	`yourblog.postlark.ai/llms.txt`	All plans
Per-post summary	`yourblog.postlark.ai/post-slug/llms.txt`	Creator+
Platform search	`api.postlark.ai/v1/discover?q=keyword`	Public

This complements traditional SEO by making your content discoverable in AI search results (GEO/AEO).

Performance

Postlark blogs ship 0 KB of JavaScript to readers:

Pure HTML from Edge Workers
CSS-only dark mode, code highlighting, reading progress
Typical Lighthouse Performance score: 95+