How do I paste Markdown into Substack?

Paste your Markdown on the left and the right panel shows Substack-friendly HTML plus a live preview. Press Copy, then paste the HTML into the Substack editor — headings, bold, italic, lists, blockquotes, links, images, and horizontal rules carry over.

Does Substack support Markdown?

Substack's editor does not interpret raw Markdown syntax directly (aside from a few shortcuts). It does, however, accept pasted rich HTML and keeps formatting like headings and bold. This tool converts your Markdown to that HTML and warns you about elements Substack tends to break.

Which elements are not supported?

Tables, footnotes, raw HTML, deep headings (H4+), and nested lists either cannot be reproduced or tend to break in Substack. The tool converts them best-effort and lists each as a warning on the right. Code blocks are emitted as , but Substack styles code weakly, so check the result after pasting.

What happens to code blocks?

Fenced (```) and inline code are converted to and . Because Substack styles code weakly, we recommend checking how it renders after pasting.

No. The conversion runs entirely in your browser. The Markdown you enter is never uploaded or stored on a server.

Yes, it is completely free. No sign-up and no installation required.

Markdown to Substack converter

Content tools

Paste Markdown, get Substack-friendly HTML with a live preview and warnings for unsupported elements. Everything runs in your browser; your data is never uploaded.

What is this Markdown to Substack converter?

A free, browser-based tool that turns Markdown into clean HTML you can paste straight into the Substack editor. Substack does not interpret raw Markdown, but it does keep formatting when you paste rich HTML — so this tool converts headings, bold, italic, lists, blockquotes, links, images, and horizontal rules into that HTML, shows a live preview, and flags elements Substack tends to break (tables, footnotes, deep headings, nested lists, raw HTML, and code blocks). Everything runs locally in your browser, so your draft is never uploaded.

How to use it

Paste your Markdown into the box on the left.
Review the converted HTML and the live preview on the right.
Check the warnings for any unsupported elements and fix them by hand if needed.
Copy the HTML and paste it into the Substack composer.

Common use cases

Drafting newsletters in Markdown (in your editor or notes app) and publishing them on Substack.
Repurposing a Markdown blog post or README into a Substack issue.
Catching formatting that Substack will break before you hit publish.

Related tools

FAQ

Operated by

Tools by Timothe AI is a suite of free tools built and operated by unbounded pioneering inc, the company behind Timothe AI.

Ryosuke SuzukiFounder & CEO

Founder & CEO of Unbounded Pioneering Inc., the company behind Timothe AI, and an expert in machine learning and AI product development. He began his career in machine learning research at a university laboratory, then designed and built large-scale products as a software engineer at PLAID, Rakuten, and Recruit, while also driving new business development. Now specializing in generative AI and AI products, he works across both engineering and business development, and is a named inventor on multiple granted patents in web technology.

Named inventor on granted patents JP6887648 & JP7480958 · Patent pending on Timothe AI technology

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