Why does Slack not support standard Markdown?

Slack uses its own formatting syntax called mrkdwn, which looks like Markdown but differs in the details. It predates Markdown becoming the universal default, and Slack kept it for backward compatibility across every client. The biggest gap is bold: Markdown uses double asterisks `**bold**`, while Slack bold is a single asterisk `*bold*`. So when you paste a GitHub comment straight into a channel, the doubled stars stay literal and the text never goes bold. Converting first gives you markup that renders correctly in any Slack message box.

How does bold change between Markdown and Slack?

This is the trap that breaks most copy-paste. In Markdown, bold is wrapped in two asterisks like `**shipped**`. In Slack mrkdwn, bold is wrapped in a single asterisk like `*shipped*`. If you paste the Markdown version, Slack shows the literal double stars. The converter rewrites `**shipped**` to `*shipped*`, and it does this carefully so it never collides with single-asterisk italic. The result pastes in and renders as real bold every time.

How do links convert to the Slack format?

Markdown links are `[text](url)`, but Slack uses an angle-bracket form: ` `. So `[Toolora](https://toolora.com)` becomes ` ` and renders as a clickable word that reads Toolora. A bare link with no text turns into ` `. Images get the same treatment, since Slack has no inline image markup in messages, so `![alt](url)` becomes ` ` as the closest faithful fallback.

What happens to Markdown headings, since Slack has none?

Slack message text has no heading sizes at all, so a `# Title` or `## Section` cannot become a larger line. The most faithful equivalent is to bold the whole line, which is exactly what the converter does: `## Release notes` becomes `*Release notes*` on its own line. That keeps the visual hierarchy of a section title readable in a channel without leaving stray hash marks in the message.

Are code blocks and inline code preserved?

Yes, and this is the one place Slack and Markdown agree. Inline code stays wrapped in single backticks, so `` `npm run build` `` passes through unchanged. Fenced code blocks keep the triple-backtick fence, though Slack ignores the language tag, so ```js becomes a plain ``` fence around the same code. Anything inside a code block is left verbatim, so asterisks or hashes in a code sample are never mistaken for formatting.

Post a release note from a GitHub Markdown changelog

Your changelog lives in Markdown with bold version numbers, a bullet list of changes and a couple of links to PRs. The team wants the same note in the announcements channel. Paste the Markdown on the left, copy the mrkdwn, and the message lands with single-star bold, clean bullets and clickable ` ` links instead of doubled asterisks and bracket soup that nobody can read.

Drop an LLM answer into a Slack thread

ChatGPT or Claude hands you a tidy answer with a heading, numbered steps and an inline code reference. Pasting it straight into Slack shows literal hashes and double asterisks. Run it through the converter and the heading becomes a bold line, the steps keep their numbering, and the inline code stays wrapped in backticks so the thread reads the way the model intended.

Share a README excerpt with a non-technical channel

A setup section of your README has bold callouts, a bullet list and a few documentation links. Marketing or support needs it in their channel, but they will not decode raw Markdown. Convert it once and the bold renders, the bullets show up as `•` rows, and every link is a real clickable word, so the excerpt reads like a native Slack message.

Reformat meeting notes before pinning them

You took notes in a Markdown editor with a heading per topic, bold decisions and a struck-through item that got dropped. Before pinning the summary to the channel, paste it through the converter so the headings bold, the decisions stand out, and the cancelled item shows as single-tilde strikethrough that Slack actually renders.

Markdown to Slack mrkdwn Converter

Paste standard Markdown, get Slack mrkdwn back: single-star bold, underscore italic, single-tilde strike, angle-bracket links, all in your browser

Runs locally
Category Format Converter
Best for Turning pasted content or local files into a handoff-friendly format.

Slack does not read standard Markdown. Paste your Markdown on the left — headings, **bold**, *italic*, ~~strike~~, `code`, fenced blocks, links and lists — and get Slack mrkdwn on the right, ready to paste into a message. Everything runs in this tab.

Markdown

Slack mrkdwn213 chars

*Release notes*

We shipped *v2* with a new <https://toolora.com/dashboard|dashboard>.

• Faster load
• _Dark mode_
• ~Old export~ removed
• `keyboard shortcuts`

> Thanks to the whole team.

```
npm run build
```

What this tool does

Slack does not render standard Markdown. Its message composer speaks a near-twin dialect called mrkdwn, and the differences bite exactly where you paste from somewhere else. Bold is a single asterisk in Slack, not the double `**` you write in a README. Italic is underscores. Strikethrough is a single tilde, not two. Links are `<url|text>`, not `[text](url)`. There are no headings at all. So a clean Markdown block from GitHub, an LLM answer, or a Notion doc pastes into Slack as literal hashes, doubled asterisks and bracketed link soup. This converter rewrites the Markdown you already have into the tokens Slack actually understands: `**bold**` becomes `*bold*`, `*italic*` becomes `_italic_`, `~~strike~~` becomes `~strike~`, headings become a bold line, bullet lists become `•` rows, and `[text](url)` flips to `<url|text>`. Inline code and fenced blocks are kept verbatim. Type on the left, the mrkdwn updates live on the right, and one click copies it ready to paste. It all runs in your browser tab, so a private channel message or an internal announcement never leaves your machine.

Tool details

Input: Files + Text + Numbers; The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output: Live result + Copy + Preview; The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy: Browser-side processing; The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share: Shareable URL state; Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget: Initial JS <= 9 KB; No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit: Format Converter · Developer; Category and role tags drive related tools, internal links, and quick fit checks.

How to use

1. Input

Paste or drop your content into the tool panel.
2. Process

Click the button. All processing is local in your browser.
3. Copy / Download

Copy the result or download to disk in one click.

How Markdown to Slack fits into your work

Use it when the main problem is getting content from one practical format into another.

Conversion jobs

Turning pasted content or local files into a handoff-friendly format.
Previewing a conversion before you use it in a larger workflow.
Cleaning small format mismatches without opening a full editor.

Conversion checks

Try a small sample first when the source format is messy.
Check character encoding, separators, and line endings after conversion.
Keep the source until the converted output has been reviewed.

Good next steps

These links move the current task into a more complete workflow.

Real-world use cases

Post a release note from a GitHub Markdown changelog
Your changelog lives in Markdown with bold version numbers, a bullet list of changes and a couple of links to PRs. The team wants the same note in the announcements channel. Paste the Markdown on the left, copy the mrkdwn, and the message lands with single-star bold, clean bullets and clickable `<url|text>` links instead of doubled asterisks and bracket soup that nobody can read.
Drop an LLM answer into a Slack thread
ChatGPT or Claude hands you a tidy answer with a heading, numbered steps and an inline code reference. Pasting it straight into Slack shows literal hashes and double asterisks. Run it through the converter and the heading becomes a bold line, the steps keep their numbering, and the inline code stays wrapped in backticks so the thread reads the way the model intended.
Share a README excerpt with a non-technical channel
A setup section of your README has bold callouts, a bullet list and a few documentation links. Marketing or support needs it in their channel, but they will not decode raw Markdown. Convert it once and the bold renders, the bullets show up as `•` rows, and every link is a real clickable word, so the excerpt reads like a native Slack message.
Reformat meeting notes before pinning them
You took notes in a Markdown editor with a heading per topic, bold decisions and a struck-through item that got dropped. Before pinning the summary to the channel, paste it through the converter so the headings bold, the decisions stand out, and the cancelled item shows as single-tilde strikethrough that Slack actually renders.

Common pitfalls

Pasting double-asterisk bold straight into Slack. Markdown uses `**word**` but Slack bold is a single asterisk `*word*`, so the raw version shows literal stars and never goes bold. Convert first, then paste the single-star output.
Leaving Markdown link syntax in place. Slack does not read `[text](url)`; it needs `<url|text>` with the url first. A pasted Markdown link shows the brackets and parentheses as plain text. The converter flips the order and brackets for you.
Expecting headings to grow. Slack messages have no heading sizes, so a `## Section` cannot render larger. People paste hashes hoping for a title and get literal `##` instead. The tool bolds the whole line as the closest faithful equivalent.

Privacy

This converter is pure client-side JavaScript: every regular expression that turns `**bold**` into `*bold*` or a `[text](url)` link into `<url|text>` runs inside your browser tab. The Markdown you paste, the Slack mrkdwn it produces and the copy button all stay on your device, with no upload and no logging of what you converted. Because the input never leaves the page, you can safely run an internal announcement, a private channel draft or a message naming a real customer through it without anything reaching Toolora or a third party.

FAQ

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Markdown to Slack mrkdwn Converter

What this tool does

Tool details

How to use

1. Input

2. Process

3. Copy / Download

How Markdown to Slack fits into your work

Conversion jobs

Conversion checks

Good next steps

Real-world use cases

Post a release note from a GitHub Markdown changelog

Drop an LLM answer into a Slack thread

Share a README excerpt with a non-technical channel

Reformat meeting notes before pinning them

Common pitfalls

Privacy

FAQ

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