Render Markdown into Beautiful Documents
A Markdown renderer turns plain-text markup into a formatted document. Mardna renders yours to a typeset page you can read, print or hand to someone else — faithfully to the Markdown specification, and entirely inside your browser.
Rendering that follows the specification
Mardna parses your document against the CommonMark specification with the GitHub Flavored Markdown extensions applied — properly, as a structured document, rather than by pattern-matching its way through the text. The output is predictable rather than idiosyncratic, and it agrees with the other tools your Markdown will pass through.
The difference shows up exactly where looser renderers give way:
- Headings receive GitHub-compatible slug identifiers, so
#section-nameanchors match the ones your repository host will generate. - Nested structures — a table inside a list item, a fence inside a blockquote — resolve the way the specification says they should.
- Raw HTML embedded in Markdown is parsed as HTML rather than escaped or dropped.
- Footnote definitions are collected and numbered in document order, wherever you wrote them.
Code, diagrams and mathematics rendered properly
Code is highlighted with the same grammars a code editor uses, so a Rust fence looks like Rust rather than like a guess — hundreds of languages, chosen by the tag on the fence. Each theme pairs its own light and dark code colours, and every block carries a copy button and optional line numbers.
Diagrams are drawn from Mermaid syntax: describe a flowchart, sequence, state, class, ER or Gantt diagram in a fenced block and it becomes vector art that stays sharp in an exported PDF.
Mathematics is typeset from LaTeX notation — inline expressions and display equations, set as real text rather than as images.
Typesetting, not just styling
Rendering Markdown correctly is only half the job; the other half is making the result readable. Mardna sets one measure for every theme so that a line never runs past a comfortable reading length, keeps a consistent vertical rhythm between headings, paragraphs and lists, and gives tables, code blocks and diagrams their own containers so a wide table scrolls instead of stretching the page.
The same care carries into print. Headings do not strand themselves at the foot of a page, code blocks and table rows are kept whole across page breaks, and links keep their destinations. That is what makes the PDF export look composed rather than screenshotted.
Rendered on your machine, not on ours
There is no upload, no queue and no rate limit, because there is no server in the loop. The renderer is JavaScript running in your tab, which means a confidential document stays confidential, rendering starts the instant you paste, and the whole thing keeps working on a plane.
It also means the rendered result is genuinely yours to take: export it as self-contained HTML and every style travels inside the file.
Frequently asked questions
What is a Markdown renderer?
It is the component that reads Markdown — the plain-text markup with # for headings and ** for bold — and produces formatted output such as HTML or a printable page. Mardna renders Markdown to a typeset page you can read and export.
Which flavour of Markdown does it render?
CommonMark plus the GitHub Flavored Markdown extensions: tables, task lists, strikethrough, footnotes and autolinks, together with GitHub-style alert blockquotes.
Does it render raw HTML inside Markdown?
Yes. HTML written inside a Markdown document is parsed and rendered, which is how elements Markdown has no syntax for — keyboard keys, details blocks, spans with attributes — survive.
Can it render Mermaid diagrams?
Yes. A fenced block marked mermaid is rendered as a vector diagram, and the diagram can be opened full screen or exported with the document.
Is rendering done on a server?
No. The entire pipeline runs in your browser, so nothing about your document leaves the machine.
Render your Markdown now
Paste a document and read the result — highlighting, diagrams and math included.