Slack mrkdwn Preview — Free Online Tool

Slack's mrkdwn looks like Markdown but isn't — it uses single asterisks for bold, underscores for italics, tildes for strikethrough, and <url|label> for links. Preview your message exactly how it renders inside a Slack thread, including mentions, channels, and emoji shortcodes.

Render <url|label> links Convert :emoji: shortcodes Auto-link bare URLs

Slack mrkdwn source

Slack preview

chars 0 / 40,000 lines 0 over a thread soft-cap? no

Slack mrkdwn vs. CommonMark

Bold — single asterisks: *bold* (not **bold**).

Italics — single underscores: _italic_ (asterisks don't italicize).

Strikethrough — tildes: ~struck~.

Inline code — backticks: `code`.

Code blocks — triple backticks. Languages are ignored; no syntax highlighting.

Links — angle-bracket form <https://url|label>. Not [label](url).

Mentions — <@U07ABC> for users, <#C04XYZ|channel> for channels, <!subteam^S01|@team> for groups, <!here> / <!channel> / <!everyone>.

Lists — no - or * bullets; just type them manually with • or numbered 1..

Headings — #/## are not rendered. Use Block Kit's header block instead.

Blockquotes — > at the start of a line, single-line only.