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Markdown Viewer and Editor

Write on the left — see the result on the right. Tables from Excel are pasted as they are, task checkboxes are clickable, and the finished document downloads as .md and .html.

What the tool can do

A live preview with scrolling synchronized to the editor, and a toolbar with the hotkeys Ctrl+B, Ctrl+I, Ctrl+K.
Copy cells from Excel or Google Sheets and paste them into the text — you get a ready Markdown table.
The task checkboxes in the preview are clickable, and [ ] and [x] change in the text by themselves.
An automatic table of contents built from headings and a button to insert it into the document.
Export: .md, a standalone HTML page (light and dark theme), copying the HTML, printing and saving to PDF.
The draft is stored automatically in your browser, and lists continue on Enter.

HTML in the preview is cleaned of dangerous code, so other people's Markdown files can be opened safely.