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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Markdown viewer and editor, right in your browser

Open a Markdown file and read it properly, or write one with a live preview - here in this tab, with nothing uploaded.

How to markdown viewer

Drop a .md file or start typing.
Read the rendered version beside it as you write.
Copy the HTML, or save the Markdown back out.

Why this one stays private

A .md file is plain text, but reading it raw is a chore and most viewers want it uploaded first. This one renders it in the tab as you type or drop it, and nothing is sent anywhere - so it is safe to open the notes you would rather keep.

Questions

Which Markdown does it understand?

GitHub-flavoured Markdown: headings, emphasis, links, tables, fenced code, strikethrough, task lists and autolinks.

Does raw HTML inside the Markdown run?

It is shown, but it cannot run: the preview is drawn in a sandbox with scripts switched off, so a pasted file cannot do anything behind your back.

Is anything saved?

Nothing leaves the tab. Your draft is kept in this browser tab only if you move to another text tool, so you do not have to paste it twice.

Can I export what I wrote?

Yes - save it as a .md file, copy the HTML, or send it to the PDF and Word converters, which open with your text already in them.

How to markdown viewer

Why this one stays private

Questions

Other tools here