Does Slack support Markdown?

Not standard Markdown. Slack uses its own formatting dialect called mrkdwn: *bold* uses single asterisks (Markdown uses double), _italic_ uses underscores, links are written instead of [label](url), and there is no syntax for headings, tables, or images. That mismatch is why pasted Markdown shows stray # and ** characters in Slack.

Why do hashtags and asterisks show up when I paste Markdown into Slack?

Slack's optional "format with markup" paste setting only understands Slack's own mrkdwn syntax, not standard Markdown. Heading markers (#), double asterisks (**), and [link](url) syntax mean nothing to Slack, so they are left in your message as literal characters. Converting the Markdown to Slack's dialect first — or pasting rich text — fixes it.

How do I convert Markdown to Slack formatting?

Paste your Markdown into the input pane above and click "Copy for Slack". The tool puts rich text on your clipboard, so pasting into the Slack message box produces native bold, italics, clickable links, nested lists, checkboxes, quotes, and code blocks — with no leftover Markdown syntax.

How do I paste ChatGPT or Claude output into Slack without broken formatting?

AI assistants answer in standard Markdown, which Slack does not render. Copy the AI's answer as Markdown, paste it into this converter, then use "Copy for Slack" and paste the result into Slack. The headings become bold lines, lists become real Slack lists, and links stay clickable.

How do I make text bold in Slack?

Wrap it in single asterisks: *bold*. Note this is the opposite of Markdown, where single asterisks mean italic and bold needs double asterisks (**bold**).

Does Slack support headings like H1 or H2?

No. Slack messages have no heading levels. The closest equivalent is a bold line of text, which is what this converter produces for #, ##, and deeper headings.

Does Slack support tables?

No. Slack has no table formatting in messages. The practical workaround — which this converter applies automatically — is rendering the table as column-aligned text inside a monospace code block.

What is Slack mrkdwn and when do I need it?

mrkdwn is Slack's plain-text markup dialect, used by the Slack API, chat.postMessage payloads, Block Kit text objects, incoming webhooks, bots, and Workflow Builder. In mrkdwn, *asterisks* mean bold, _underscores_ mean italic, ~tildes~ mean strikethrough, and links are . Use this tool's "copy mrkdwn" button when you need that form.

Is this Markdown to Slack converter free and private?

Yes. It is free, requires no sign-up, and converts everything locally in your browser — your text is never uploaded to a server.

MarkToSlack — Markdown to Slack Converter

Why Markdown breaks in Slack

Slack does not render standard Markdown. It uses its own dialect, mrkdwn, where *single asterisks* mean bold, _underscores_ mean italic, and links are written <url|label>. Headings, tables, and images have no syntax at all. So when you paste Markdown — from a README, release notes, or a ChatGPT/Claude answer — Slack leaves the # marks, ** asterisks, and [link](url)brackets sitting in your message, even with Slack's "format with markup" paste option turned on.

This converter fixes that in both directions Slack understands: it copies rich text that the Slack composer turns into native formatting on paste, and it produces mrkdwn for API payloads, bots, and Workflow Builder. Conversion happens entirely in your browser; nothing is uploaded.

Markdown → Slack conversion cheat sheet

Element	Markdown	Slack
Heading	`# Heading`	Heading (bold line — Slack has no headings)
Bold	`bold`	bold (single asterisks)
Italic	`italic or _italic_`	_italic_ (underscores)
Strikethrough	`~~strike~~`	~strike~ (single tildes)
Link	`[label](https://url)`	<https://url\|label> (or a real link via rich paste)
Image	`![alt](https://url)`	link to the image (Slack can't paste-embed images)
Bullet list	`- item`	• item (◦ and ▪ when nested)
Numbered list	`1. item`	1. item (kept as typed numbers)
Task list	`- [ ] / - [x]`	☐ todo / ☑ done
Blockquote	`> quote`	> quote (same syntax)
Inline code	`code`	`code` (same syntax)
Code block	```lang … ```	``` … ``` (language tag dropped)
Table	`\| a \| b \|`	aligned monospace text inside a code block
Divider	`---`	───────────── (a plain rule line)

How to convert Markdown for Slack

Paste your Markdowninto the input pane — release notes, docs, or an AI assistant's answer.
Check the preview. The right pane renders your message exactly the way Slack will.
Click "Copy for Slack" and paste into the Slack message box. Bold, links, lists, checkboxes, quotes and code blocks arrive as native Slack formatting.

Frequently asked questions

Does Slack support Markdown?: Not standard Markdown. Slack uses its own formatting dialect called mrkdwn: *bold* uses single asterisks (Markdown uses double), _italic_ uses underscores, links are written <url|label> instead of [label](url), and there is no syntax for headings, tables, or images. That mismatch is why pasted Markdown shows stray # and ** characters in Slack.
Why do hashtags and asterisks show up when I paste Markdown into Slack?: Slack's optional "format with markup" paste setting only understands Slack's own mrkdwn syntax, not standard Markdown. Heading markers (#), double asterisks (**), and [link](url) syntax mean nothing to Slack, so they are left in your message as literal characters. Converting the Markdown to Slack's dialect first — or pasting rich text — fixes it.
How do I convert Markdown to Slack formatting?: Paste your Markdown into the input pane above and click "Copy for Slack". The tool puts rich text on your clipboard, so pasting into the Slack message box produces native bold, italics, clickable links, nested lists, checkboxes, quotes, and code blocks — with no leftover Markdown syntax.
How do I paste ChatGPT or Claude output into Slack without broken formatting?: AI assistants answer in standard Markdown, which Slack does not render. Copy the AI's answer as Markdown, paste it into this converter, then use "Copy for Slack" and paste the result into Slack. The headings become bold lines, lists become real Slack lists, and links stay clickable.
How do I make text bold in Slack?: Wrap it in single asterisks: *bold*. Note this is the opposite of Markdown, where single asterisks mean italic and bold needs double asterisks (**bold**).
Does Slack support headings like H1 or H2?: No. Slack messages have no heading levels. The closest equivalent is a bold line of text, which is what this converter produces for #, ##, and deeper headings.
Does Slack support tables?: No. Slack has no table formatting in messages. The practical workaround — which this converter applies automatically — is rendering the table as column-aligned text inside a monospace code block.
What is Slack mrkdwn and when do I need it?: mrkdwn is Slack's plain-text markup dialect, used by the Slack API, chat.postMessage payloads, Block Kit text objects, incoming webhooks, bots, and Workflow Builder. In mrkdwn, *asterisks* mean bold, _underscores_ mean italic, ~tildes~ mean strikethrough, and links are <url|label>. Use this tool's "copy mrkdwn" button when you need that form.
Is this Markdown to Slack converter free and private?: Yes. It is free, requires no sign-up, and converts everything locally in your browser — your text is never uploaded to a server.