Turn Markdown files into native Slack Canvases
Slack doesn't render Markdown files — an uploaded .md shows up as a plain code snippet. Arialine converts any Markdown file (or pasted Markdown) into a proper Slack Canvas: headings, lists, and tables render natively, and every ```mermaid block is pre-rendered into an embedded diagram image.
Why Markdown dies in Slack
- An uploaded README or design doc displays as a raw text snippet nobody scrolls through.
- Copy-pasting Markdown into a message mangles headings and tables.
- Docs with embedded Mermaid lose their diagrams entirely.
- Linking out to GitHub or Notion pulls the discussion away from where the team already is.
How Markdown-to-Canvas works
Drop the file
Share a .md or .markdown file in any channel where Arialine is present and it renders automatically (a per-channel toggle). The canvas link posts in the file's thread by default, or as a new channel message.
Or use a shortcut
Use the message shortcut 'Render as canvas' on any .md attachment or pasted Markdown text, or the global 'Markdown to canvas' shortcut from anywhere in Slack — Arialine DMs you the link.
Mermaid blocks become diagrams
Every ```mermaid code block inside the document is rendered to an image and embedded in the canvas. A block that fails to render is left as code — never silently dropped.
Slack-proof sanitization
Markdown that Slack Canvases reject (like a blockquote nested in a list) is progressively sanitized and retried, so real-world docs actually convert.
Frequently asked
Does this work in DMs?+
Yes — DM a .md file to Arialine and it sends back the canvas link.
What Markdown features are supported?+
Everything Slack Canvas supports natively — headings, lists, tables, images — plus Mermaid code blocks, which Arialine pre-renders as embedded images.
Can I turn off auto-rendering?+
Yes, per channel: /arialine md auto off. The manual shortcuts keep working.
Related use cases
Try it in your workspace
Free for small teams. Arialine only joins channels you invite it to.
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