Convert Substack Posts to Markdown, Export Without Paywall Chrome

Substack has become the home of long-form writing, newsletters, essays, research, and analysis. But the reading experience includes paywall prompts, signup walls, and browser chrome that gets in the way.

AnyPost converts any Substack post to clean Markdown: just the content, properly formatted, ready for reading, archiving, or feeding to AI tools.

Why Convert Substack to Markdown?

Clean Reading Experience

Substack's UI is designed for newsletter signup, not focused reading. Converting to Markdown removes:

• Paywall overlays and signup prompts
• Newsletter subscription CTAs
• Author bio sidebars
• Related post recommendations
• Cookie consent banners

Research and Reference

Researchers, students, and analysts use Substack as a source:

• Cite sources with clean attribution
• Quote accurately from the original text
• Compare arguments across multiple writers
• Build literature reviews from newsletter content

Content Migration

Writers and publishers often need to:

• Backup their own posts before platform changes
• Republish excerpts on their website or blog
• Create compilations from newsletter series
• Migrate to another platform with Markdown import

How It Works

The URL Swap

Before: https://bigtechnology.substack.com/p/clean-markdown-for-llms
After:  https://anypost.md/substack/bigtechnology.substack.com/p/clean-markdown-for-llms

Replace the domain with anypost.md/substack/ and load the page.

Custom Domains Work Too

Many Substacks use custom domains:

Before: https://author.substack.com/p/post-title
After:  https://anypost.md/substack/author.substack.com/p/post-title

Any Substack subdomain or custom domain works the same way.

Sample Output

# Clean Markdown for LLMs

## Why structured text matters for AI context

Large language models process plain text best. When you feed them content from the web, they have to parse HTML, strip ads, and ignore navigation, all of which consumes tokens without adding value.

### The problem with copy-paste

When you copy from a website, you often get:

- Hidden formatting characters
- Navigation text mixed with content
- Relative links that don't resolve
- styling artifacts

### The Markdown solution

Markdown gives you:

- **Semantic structure**, headings, lists, paragraphs
- **Clean links**, full URLs, properly formatted
- **Portable content**, works in any text editor
- **Token efficiency**, no wasted characters for LLMs

---
Originally published on [Substack](https://bigtechnology.substack.com/p/clean-markdown-for-llms)

What's Preserved

AnyPost maintains the structure and formatting of Substack posts:

Substack Element	Markdown Output
Post title	# Heading
Section headings	## ###
Body text	Paragraphs
Ordered lists	1. 2. 3.
Unordered lists	- items
Block quotes	> quotes
Links	text
Images
Horizontal rules	---

Including Comments

Substack Notes (substack.com/@author/note/c-…) often have valuable discussion in replies. Add ?comments=on to include guest-visible replies:

https://anypost.md/substack/substack.com/@author/note/c-12345678?comments=on

Long-form /p/ articles do not expose comments in the reader yet. Replies are formatted with author attribution under a Comments section.

Pro Plan Access

Substack conversion requires Pro plan or higher:

Plan	Substack Support
Starter ($5)	—
Pro ($19)	✓
Scale ($49)	✓
Agency ($99)	✓

This is due to the fetch infrastructure needed for JavaScript-rendered Substack content.

Use Cases

Research Collections

Build Markdown archives of expert analysis:

# Save posts for literature review
curl -H "Authorization: Bearer apk_live_xxx"   "https://anypost.md/substack/author.substack.com/p/post-slug"   > ~/research/post-slug.md

Newsletter Backups

Writers can backup their own content:

# Archive all posts (scripted)
for url in $(cat post-urls.txt); do
  curl -H "Authorization: Bearer apk_live_xxx"     "https://anypost.md/substack/${url}"
done

Content Analysis

Feed Substack writing to AI for analysis:

Analyze the writing style and key arguments in this Substack post:

[paste anypost.md output]

Identify the thesis, supporting evidence, and conclusion structure.

API Access

# Direct URL with API key
curl -H "Authorization: Bearer apk_live_xxx"   "https://anypost.md/substack/author.substack.com/p/post-slug"

# JSON API for metadata
curl -H "Authorization: Bearer apk_live_xxx"   "https://anypost.md/api/convert?url=https://author.substack.com/p/post-slug"

Related Conversions

• Convert Medium articles to Markdown
• Convert X long-form articles
• All supported platforms

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Last updated: May 28, 2026