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Format Conversion

Markdown to Slack mrkdwn

· Last updated：2026-06-17

Convert GitHub-flavored Markdown into Slack-friendly mrkdwn and flag unsupported constructs

Details

What this tool helps you do

Rewrites headings, emphasis, lists, links, and code fences into Slack-style formatting, while surfacing tables, task lists, images, and other elements that may need manual cleanup.

Execution

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Written by the Elysia Tools team
Conversion369
Format Conversion142
Markdown40

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Format Conversion
Input types
textarea, checkbox
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert GitHub-flavored Markdown documents into Slack-compatible mrkdwn syntax while identifying unsupported formatting elements. This tool rewrites headings, bold/italic text, lists, links, and code blocks into Slack's specific markup format, and flags elements like tables or task lists that require manual adjustment.

When to use

  • When preparing release notes, changelogs, or documentation written in Markdown for posting in Slack channels.
  • When you need to identify incompatible Markdown elements like tables, task lists, or images before sending messages to Slack.
  • When formatting automated notification templates to ensure they render correctly in the Slack chat interface.

How it works

  1. 1Paste your GitHub-flavored Markdown text into the input area.
  2. 2Toggle the option to annotate unsupported elements if you want to flag structures like tables or task lists.
  3. 3Click convert to generate the Slack-friendly mrkdwn output along with a list of elements requiring manual cleanup.

Use cases

  • Formatting software release notes from GitHub to share in team Slack channels.
  • Converting project documentation summaries into clean Slack announcements.
  • Identifying incompatible Markdown syntax in automated notification templates before sending them to Slack webhooks.

Examples

1. Converting GitHub Release Notes for Slack

Release Engineer

Background

A release engineer needs to share the latest software update notes, written in GitHub-flavored Markdown, in a company-wide Slack channel.

Problem

The Markdown contains headers, bullet points, and a task list, which do not render correctly when pasted directly into Slack.

How to use

Paste the release notes Markdown into the input field, check 'Annotate Unsupported Elements', and run the converter.

{"annotateUnsupported": true}

Outcome

The tool outputs Slack-compatible mrkdwn with bold headers and bullet points, and flags the task list as an unsupported element for manual adjustment.

2. Preparing Documentation Summaries

Technical Writer

Background

A technical writer wants to share a quick summary of a new API documentation page in a developer Slack channel.

Problem

The summary contains inline code blocks, bold text, and a markdown table that Slack cannot render natively.

How to use

Input the markdown summary text and convert it with unsupported annotations enabled.

FAQ

How does this tool handle Markdown headings?

It converts standard Markdown headings (like # Heading) into bold text (*Heading*) because Slack does not natively support header sizes.

What happens to unsupported elements like tables or images?

If annotation is enabled, the tool flags these elements in the output JSON so you can manually format or remove them.

Does this tool post directly to Slack?

No, it only converts the text format. You must copy the resulting mrkdwn and paste it into Slack or send it via Slack's API.

How are lists converted?

Standard Markdown bullet lists are converted to Slack-friendly bullet points using bullet characters (•).

Can I convert task lists?

Task lists are not natively supported by Slack mrkdwn and will be flagged as unsupported elements for manual cleanup.

Hub

Release Notes Review and Website, Slack, and PDF Delivery

Review one release against its changelog, validate version syntax and Markdown references, then prepare consistent website, Slack, and PDF release notes.

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{"annotateUnsupported": true}

Outcome

The inline code and bold text are converted to Slack syntax, and the table is flagged so the writer knows to replace it with a text-based list.