Convert Markdown to Notion

Notion's API doesn't accept markdown—it requires complex block JSON. Mark2Notion lets you convert markdown to Notion and append it to any page with a single API call. No more manual conversion or wrestling with Notion import markdown limitations.

Get API Key Free See How It Works

The Problem with Notion's API

If you've tried to send markdown to Notion programmatically, you've discovered that Notion's API doesn't understand markdown at all. Instead, it uses a complex block JSON structure that requires significant transformation logic to get right.

Notion 2000 Character Limit

Each text block is limited to 2000 characters. Exceed this and your API call fails. You need to split content at word boundaries while preserving formatting.

100 Blocks Per Request

Notion only accepts 100 blocks per API call. Large documents require chunking into multiple requests, processed sequentially to maintain order.

Limit of Max 2 Levels of Nesting

Notion's API restricts nesting to only 2 levels. You can't send lists with 3+ levels of hierarchy directly. Deeper structures require workarounds to flatten or reorganize.

Complex Block JSON

Notion's block format requires understanding rich_text arrays, nested children, and specific type structures. Simple text becomes verbose JSON.

What you want to send:

# Meeting Notes

- Discussed **project timeline**
- Agreed on March 1st deadline

What Notion's API actually requires:

{
  "children": [
    {
      "type": "heading_1",
      "heading_1": {
        "rich_text": [{"type": "text", "text": {"content": "Meeting Notes"}}]
      }
    },
    {
      "type": "bulleted_list_item",
      "bulleted_list_item": {
        "rich_text": [
          {"type": "text", "text": {"content": "Discussed "}},
          {"type": "text", "text": {"content": "project timeline"}, "annotations": {"bold": true}},
        ]
      }
    }
  ]
}

How Mark2Notion Works

Our markdown to Notion API handles all the complexity. Send your markdown, and we convert it to properly formatted Notion blocks, handle all the API limits, and append it to your page—all in one call.

1

Send Markdown

POST your markdown content with your API key and Notion credentials

2

We Convert & Handle Limits

Automatic splitting, chunking, rate limiting, and retry logic

3

Content in Notion

Your formatted content appears in your Notion page instantly

cURL Example 
curl -X POST "https://api.mark2notion.com/api/append" \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "markdown": "# Project Update\n\n## Completed\n- Database migration\n- API testing\n\n## Next Steps\n1. Deploy to staging\n2. User testing",
    "notionToken": "secret_YOUR_NOTION_TOKEN",
    "pageId": "YOUR_PAGE_ID"
  }'
Response 
{
  "status": "success",
  "data": {
    "totalBlocks": 7,
    "requestCount": 1,
    "retryCount": 0,
    "lastBlockId": "abc123-def456-ghi789"
  }
}
Tables

Full GFM support

Nested Lists

Any depth

Code Blocks

With syntax

Long Content

Auto-chunked

Use Cases

ChatGPT to Notion

Send AI output to Notion directly. Whether it's ChatGPT, Claude, or any LLM, pipe the markdown response straight to your Notion workspace.

Meeting Notes

Transcription services output markdown. Send those meeting summaries, action items, and decisions directly to your team's Notion.

Documentation

Keep technical docs in markdown for version control, then sync to Notion for easy reading. Notion API text formatting preserved.

Blog Content

Draft in your favorite markdown editor, publish to Notion as your CMS. Tables, images, and formatting all work.

Works With Your Tools

Mark2Notion is a simple REST API. If your tool can make HTTP requests, it can send markdown to Notion. No SDKs required—just a POST request.

Zapier

Webhooks by Zapier
Make

HTTP Module
n8n

HTTP Request Node
Pipedream

Any HTTP step

Any tool that can make HTTP requests works. Use the cURL examples in our quickstart guide and adapt for your platform.

Get Started Free

Start with 100 free requests per month. No credit card required. Upgrade to Pro for 2,000 requests at $19/month.

Get API Key Free Read the Docs

100 requests/month free • Full feature access • No credit card

Frequently Asked Questions

How do you handle the Notion 2000 character limit?

We automatically split text blocks at word boundaries when they exceed 2000 characters. Formatting is preserved across splits, so your bold, italic, and other styling remains intact.

Can I send ChatGPT output directly to Notion?

Yes! This is one of our most popular use cases. Any AI output to Notion workflow works—just pass the LLM's markdown response to our API. We handle tables, code blocks, and all formatting that AI assistants typically output.

What markdown features do you support?

We support headers (H1-H3), bold, italic, strikethrough, links, bulleted lists, numbered lists, nested lists, code blocks with syntax highlighting, blockquotes, tables (GFM format), and checkboxes/to-dos.

How does the Notion API markdown integration work with rate limits?

We handle all rate limiting automatically. Our API includes 400ms delays between Notion API calls and exponential backoff (1s, 2s, 4s) when rate limited. You never see 429 errors—we retry transparently.

Guides

Learn how to integrate Mark2Notion into your automation workflows, handle complex scenarios, and get the most out of our API.