Comma

Free tools

Small, focused browser tools for the moment you have a file and no good way to show it to anyone. They run entirely on your machine — nothing is uploaded unless you ask for a link.

HTML viewer

Open the HTML viewer →

Paste HTML or drop an .html file and watch it render — CSS, JavaScript and charts included — in a sandboxed preview at desktop, tablet and mobile widths. This is the fastest way to check what a build artifact, a coverage report or an AI-generated page actually looks like before you send it on.

Markdown to HTML

Open the Markdown converter →

Paste Markdown or drop a .md file and get clean HTML: GitHub-flavored tables, fenced code blocks, lists, blockquotes and links. Copy the fragment for a CMS or an email, download a standalone styled page, or publish it as a link. Useful for the output of an agent run, a meeting summary, or a README you need a non-Git audience to read.

Why the link is better than the file

Every tool here ends with the same option: turn what you're looking at into a Comma report.

  • One URL, not an attachment. Nobody has to download anything, unzip anything, or trust that their machine renders it the same way yours did.
  • Comments anchored in place. Readers select a paragraph, a table row or a chart and comment there, instead of writing "third chart, second bar" in a chat thread.
  • Revisions. Publish again and the old version is kept, so you can see what moved between Tuesday and Friday.
  • Access you control. Private, invite-only, or open to anyone with the link — changeable after the fact.

Comma is free: unlimited reports, unlimited commenters, no seat count.

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