You write `**bold**`, `[link text](url)`, and a fenced code block — and then squint at the page wondering whether the rendered version will actually look right. Our free online Markdown Editor takes the guesswork out of that. The page is split down the middle: write Markdown on the left, see the live HTML render on the right, every keystroke. There is nothing to install, no account to create, and no draft is ever uploaded — your text lives in the browser tab and disappears when you close it (or stays in local storage if you want it to persist between sessions). The renderer is GitHub Flavored Markdown compatible, which is the dialect most people actually mean when they say "Markdown" today: standard headings and emphasis, of course, but also tables with column alignment, fenced code blocks with language hints, autolinked URLs, task list checkboxes (`- [ ]` and `- [x]`), strikethrough with double tildes, and proper handling of line breaks. Real-world workflows that benefit from a live editor: writing a README before pasting it into a new GitHub repo, drafting a Stack Overflow answer where the formatting matters and the in-page preview is slow, putting together documentation for an internal wiki that uses Markdown as its source format, composing a long Notion or Obsidian note in a distraction-free space, preparing a Reddit post where you cannot see the result until after you submit, and writing technical blog posts for static site generators like Hugo, Jekyll, or Astro that consume Markdown directly. The editor also has a toggle to switch between split view, editor-only, and preview-only — useful when you want a focused writing mode or a focused proofreading mode. If you finish a Markdown file and need to publish it as a PDF, the [HTML to PDF](/tools/html-to-pdf) tool will accept the rendered HTML and produce a clean printable file. If you are writing prose and want a quick check on how readable it is, the [Readability Checker](/tools/readability-checker) gives you Flesch-Kincaid and Gunning Fog scores in one click. And for technical writers comparing Markdown against alternatives like reStructuredText or AsciiDoc, the practical reason to stick with Markdown is portability: every modern documentation platform, every static site generator, every code-hosting site, and most note apps speak it natively, which is something none of the alternatives can claim. The editor handles documents up to several hundred kilobytes without lag, supports Unicode and emoji throughout, and renders code blocks with syntax highlighting in a generic monospaced style that travels well into any rendering target.