What Is a Markdown Preview Tool?
Markdown is easy to write but hard to read in its raw form: tables collapse into pipes and dashes, headings are just hash marks, and it is easy to miss a broken link or an unclosed code fence until it is too late. A markdown preview tool solves this by rendering the formatted result as you type, so what you see matches what readers will actually see. This free markdown editor online works as a genuine markdown preview online: paste or type Markdown on one side and see the rendered HTML on the other, updated on every keystroke. It doubles as a markdown to html converter whenever you need the rendered output itself, not just a visual check.
How This Markdown Editor Works
Under the hood, this live markdown preview parses your input using marked, the same GitHub Flavored Markdown engine used across much of the developer tooling ecosystem, then renders the result into scoped, theme-aware HTML. Three view modes are available: split, which shows the raw Markdown and the rendered preview side by side; editor-only, for focused writing; and preview-only, for a clean read of the final result. Because parsing happens entirely in the browser, this markdown renderer online never sends what you write to a server, and the preview updates instantly rather than waiting on a network round trip.
GitHub Flavored Markdown Support
Plain Markdown covers headings, bold, italics, links, and basic lists, but most real-world writing, especially README files and pull request descriptions, relies on GitHub Flavored Markdown extensions: tables, fenced code blocks with language hints, task-list checkboxes, and strikethrough text. This online markdown editor supports all of these, so a table written with pipes and hyphens renders as an actual table, and a checkbox list written with a bracket-x syntax renders as a checked box rather than literal brackets. As a github flavored markdown preview, it matches what you would see once the same file is pushed to a repository.
Copying Markdown vs. HTML Output
Two copy buttons are available for different situations. Copy Markdown grabs the raw source exactly as typed, useful when you are saving a draft or moving the file into version control. Copy HTML grabs the rendered output instead, useful when pasting formatted content into a CMS, an email client, or any editor that does not understand Markdown syntax directly. Since this tool works as a reliable md to html online converter as well as a preview, you are not limited to just checking your formatting, you can walk away with either format depending on where the content is headed next.
Common Use Cases for Markdown Preview
Previewing a README before pushing it to a repository, drafting a GitHub issue or pull request description and confirming the formatting renders correctly, checking that a table lines up the way you intended, or writing a blog post draft in Markdown before pasting the HTML into a publishing platform are all common reasons to reach for a markdown viewer online. Because the rendering happens instantly and locally, it is also a fast way to sanity-check formatting mid-write, without committing a file or opening a separate application.