Free Markdown Previewer
Write or paste Markdown and instantly see it rendered as HTML with a live preview. Powered by marked, the most widely used open-source Markdown parser for JavaScript with millions of weekly npm downloads. Supports full GitHub Flavored Markdown (GFM) — tables, task lists, strikethrough, fenced code blocks, autolinks, and blockquotes — on top of the CommonMark specification. Switch between four layout modes: side-by-side, stacked, editor-only, and preview-only, plus fullscreen mode for distraction-free writing. All processing happens locally in your browser — no signup, no server, no data sent anywhere.
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What Is Markdown and Why Use a Live Previewer?
Markdown is a lightweight markup language created by John Gruber in 2004 that allows you to format plain text using intuitive symbols — asterisks for bold and italic, hashes for headings, dashes for lists, and brackets for links and images. It has become the universal standard for writing technical content, adopted by GitHub for README files and documentation, by platforms like Notion, Obsidian, and Confluence for notes and wikis, by static site generators like Hugo, Jekyll, and Gatsby for blog posts, and by communication tools like Slack, Discord, and Jira for message formatting. Markdown files are plain text, making them version-controllable with Git, portable across every operating system, and readable even without rendering.
The challenge with Markdown is that you write in plain text but need to see how it renders — especially for complex structures like tables, nested lists, code blocks, and image layouts. A live Markdown previewer eliminates the guess-and-check cycle of writing, committing, and refreshing. This tool shows you the rendered HTML output instantly as you type, so you can catch broken links, misaligned tables, incorrect heading levels, and formatting errors before they reach your audience. The side-by-side layout mirrors the workflow used by professional documentation teams and technical writers worldwide.
This previewer is powered by marked, the most widely used open-source Markdown parser for JavaScript, with millions of weekly downloads on npm. marked is designed as a high-speed, low-level compiler that parses Markdown without caching or blocking, making it ideal for real-time preview applications. It supports the CommonMark specification as the baseline and GitHub Flavored Markdown extensions on top, ensuring your Markdown renders consistently with how it will appear on GitHub, GitLab, Bitbucket, and most modern platforms.
GitHub Flavored Markdown Features Supported
GitHub Flavored Markdown (GFM) is a strict superset of the CommonMark specification, developed by GitHub to extend standard Markdown with features commonly needed in software development workflows. GFM adds tables with column alignment using colons in the separator row, task lists with checkbox syntax for tracking to-dos in issues and pull requests, strikethrough text using double tildes, fenced code blocks with language identifiers for syntax-aware formatting, autolinked URLs and email addresses that become clickable without explicit link syntax, and restrictions on raw HTML for security on multi-user platforms.
This tool has GFM enabled by default, meaning every GFM feature renders correctly in the preview. You can write pipe-delimited tables and see them formatted with proper borders and alignment. Task lists render with checkboxes. Fenced code blocks display with monospace fonts and a distinct background, tagged with the specified language class for optional syntax highlighting. Autolinked URLs become clickable in the preview. If you are writing README.md files, GitHub Issues, Pull Request descriptions, or wiki pages, this previewer shows you exactly what your audience will see.
Beyond GFM, the tool supports all standard Markdown elements defined by CommonMark: ATX and Setext headings (levels 1-6), ordered and unordered lists with nesting, inline code with backticks, block-level code blocks, blockquotes with nesting, horizontal rules, emphasis and strong emphasis, links (inline, reference, and autolink), images with alt text, and hard and soft line breaks. This covers virtually every Markdown construct you will encounter in real-world documentation, blog posts, and technical writing.
Practical Use Cases for Markdown Editing
Developers use this tool most often to preview GitHub README files before committing. A well-formatted README is the first impression of any open-source project — broken tables, misaligned badges, or incorrect heading hierarchy make a project look unprofessional. By previewing locally, you can iterate on formatting instantly without polluting your commit history with typo fixes. The same workflow applies to CONTRIBUTING.md, CHANGELOG.md, LICENSE files, and GitHub Wiki pages that all use Markdown.
Technical writers and content creators use live Markdown previewers to draft blog posts, documentation, API guides, and tutorials. Platforms like Hugo, Jekyll, Gatsby, Next.js, and Docusaurus all use Markdown as their content source. Writing in this previewer lets you verify formatting, test code block rendering, and check link syntax before copying the content into your project. The HTML export feature is also useful for pasting formatted content directly into email newsletters, CMS platforms like WordPress or Ghost, or any system that accepts HTML input.
Students, researchers, and knowledge workers use Markdown for note-taking in tools like Obsidian, Notion, Logseq, and Joplin. This previewer serves as a quick sandbox to test Markdown syntax, learn new formatting tricks, or convert notes to HTML for sharing. The four layout modes — side-by-side, stacked, editor-only, and preview-only — adapt to different screen sizes and workflows, from wide desktop monitors to narrower laptop screens. Fullscreen mode removes all distractions for focused writing sessions.
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How It Works
Type or paste Markdown into the editor on the left.
See the rendered HTML preview update live on the right — switch between side-by-side, stacked, editor-only, or preview-only layouts.
Copy the rendered HTML or the raw Markdown with one click.
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Key Features
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Use Cases
Limitations
- Does not support custom Markdown extensions beyond GFM
- HTML sanitization may strip some advanced inline HTML
- Very large documents may slow the live preview on older devices
- No built-in file save — copy your work before closing the tab