| Format | Markdown | Slack mrkdwn | Support |
|---|---|---|---|
| Bold | **text** | *text* | ✅ |
| Italic | *text* | _text_ | ✅ |
| Strikethrough | ~~text~~ | ~text~ | ✅ |
| Code | `code` | `code` | ✅ |
| Code block | ```lang``` | ```lang``` | ✅ |
| Link | [text](url) | <url|text> | ✅ |
| Heading | # H1 | *H1* | ⚠️→Bold |
| Blockquote | > text | >>> text | ✅ |
| List | - item | • item | ✅ |
| Ordered list | 1. item | 1. item | ✅ |
| Horizontal rule | --- | ———————— | ✅ |
Slack mrkdwn is Slack's own Markdown variant with different syntax. For example, bold uses * instead of **, and links use <url|text> instead of [text](url).
Slack doesn't support heading syntax. Headings are converted to bold text.
Absolutely. All conversions happen locally in your browser. No data is ever sent to any server.