markdown-slack-mapping

Below is a comprehensive Markdown table mapping common Markdown elements to their Slack equivalents (message and post interfaces use the same underlying “mrkdwn” syntax). Unsupported elements are noted as such.

Feature	Standard Markdown Syntax	Slack Syntax / Notes	Support
Headings	# Heading 1 ## Heading 2	Not supported in messages (Block Kit headers exist but not via #)	No
Paragraphs	Blank line separates paragraphs	No explicit paragraph syntax – use a blank line or Shift+Enter	No
Line breaks	Two spaces at end +	Shift+Enter (literal not parsed in message UI)	No
Bold	**bold**	*bold* (asterisks)	Yes
Italic	*italic* or _italic_	_italic_ (underscores only)	Partial
Strikethrough	~~strike~~	~strike~	Partial
Blockquote	> quote	> quote	Yes
Ordered list	1. item	1. item	Yes
Unordered list	- item or * item	• item or - item (bullets rendered automatically)	Yes
Inline code	`code`	`code`	Yes
Fenced code block	code	code	Yes
Horizontal rule	---	Not supported	No
Links	[text](http://example.com)	`<http://example.com	text>` or auto-link by pasting URL
Images		Not via Markdown – upload or drag-and-drop	No
Tables	`	col1 | col2	`
Definition lists	Term : Definition	Not supported	No
Footnotes	[^1]	Not supported	No
Task lists	- [ ] item	Not supported	No
HTML	<br>, <em>	Not supported	No
Emoji	:smile: or Unicode 😄	:smile: (auto-converted) or paste Unicode	Yes
Automatic URL linking	<http://example.com>	Paste URL – auto-linked	Yes
Disable auto-link	`<http://example.com	http://...>`	Use < `
: https://en.markdown.net.br/tools/slack/