Preview Markdown Files Online Free — With Math, Diagrams & Syntax Highlighting

Render and preview any Markdown file instantly in your browser. Full GitHub Flavored Markdown support with LaTeX math equations, Mermaid diagrams, syntax highlighting for 180+ languages, and auto-generated table of contents. Free and private.

Drop your Markdown file here

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Or enter a URL

Why Use Our Markdown Viewer?

Your Data Stays With You

Everything happens right in your browser. Your data never leaves your computer - that's our privacy promise.

Lightning Fast

See your data instantly, even with large files. No more waiting around for uploads to finish.

Smart Tools

Powerful features designed specifically for Markdown files, making it easy to work with your data.

What is Markdown?

Markdown is a lightweight markup language created by John Gruber and Aaron Swartz in 2004. It allows you to write formatted text using plain text syntax that is easy to read and write. Markdown has become the standard for documentation, README files, and content authoring across the software development world.

GitHub Flavored Markdown (GFM), an extension of the original specification, adds support for tables, task lists, strikethrough text, and fenced code blocks. GFM is used by GitHub, GitLab, Bitbucket, and many other platforms for rendering documentation and comments.

Beyond software development, Markdown is used for blogging (Jekyll, Hugo, Gatsby), note-taking (Obsidian, Notion, Bear), academic writing (Pandoc), and technical documentation (MkDocs, Docusaurus). Its simplicity and portability make it one of the most versatile text formats available.

Plain text format that is human-readable even without rendering
Standard for README files, documentation, and developer content
GitHub Flavored Markdown adds tables, task lists, and code blocks
Supported by major platforms: GitHub, GitLab, Stack Overflow, Reddit
Converts easily to HTML, PDF, DOCX, and other formats via Pandoc
Used in note-taking apps, static site generators, and CMS platforms

Common Questions

What is Markdown?

Markdown is a lightweight markup language that you can use to add formatting elements to plaintext text documents. Created by John Gruber in 2004, Markdown is now one of the world's most popular markup languages.

How do I use this tool?

Simply drag and drop your Markdown file onto the upload area, or click to select a file from your device. You can also paste a URL to a Markdown file and click "Load". Your document will be processed instantly in your browser - no server uploads required!

Is my data secure?

Absolutely! Your files never leave your device - everything is processed locally in your browser. We have no servers that store or process your content.

What Markdown features are supported?

We support GitHub Flavored Markdown (GFM), including tables, task lists, syntax highlighting for code blocks, automatic linking, and more. We also support math equations (LaTeX via KaTeX) and Mermaid diagrams.

Does this viewer support math equations?

Yes! We support LaTeX math equations using KaTeX. Use $...$ for inline math and $$...$$ for block math. For example, $E = mc^2$ renders inline, and block equations are centered on their own line.

Can I create diagrams in Markdown?

Yes! We support Mermaid diagrams. Simply use a code block with the language set to 'mermaid' and write your diagram definition. We support flowcharts, sequence diagrams, class diagrams, and more.

Can I copy code from code blocks?

Absolutely! Every code block has a 'Copy' button that lets you copy the code to your clipboard with one click. The code blocks also include syntax highlighting for many programming languages.

Is there a table of contents?

Yes! A table of contents is automatically generated from your document's headings. You can use it to quickly navigate to different sections of your document.

Can I export my rendered Markdown?

Yes! You can export your rendered document to HTML, or download the original Markdown file. Use the export menu in the toolbar to access these options.

What are GitHub-style alerts?

GitHub-style alerts are special blockquotes that display as colored callouts. Start a blockquote with [!NOTE], [!TIP], [!IMPORTANT], [!WARNING], or [!CAUTION] to create an alert box.