Markdown Viewer

Online Markdown editor with live preview. Write Markdown and see it rendered instantly.

Updated Dec 06, 2025

Markdown Source

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Preview

📝 Markdown Live Preview

Welcome to the FreeTools Markdown Editor! This editor supports GitHub Flavored Markdown and Mermaid diagrams.

🚀 Features

Live Preview: Type on the left, see results on the right.
Syntax Highlighting: Code blocks look great.
Mermaid Diagrams: Flowcharts, sequence diagrams, and more!
Tables & Task Lists: Perfect for documentation.

📊 Comparison Table

Feature	Markdown	HTML
Easy to write	✅	❌
Readable source	✅	❌
Full control	❌	✅

🔀 Mermaid Diagram

✅ To-Do List

Create a cool markdown editor
Add syntax highlighting
Support Mermaid diagrams
Add dark mode support

💻 Code Snippet

function sayHello(name) {
  console.log(`Hello, ${name}!`);
}

sayHello('Developer');

"Simplicity is the ultimate sophistication." - Leonardo da Vinci

🎨 Blockquote & Formatting

You can also use italics, bold, or ~~strikethrough~~ text.

Docs ready

Write Markdown with instant previews

GitHub Flavored Markdown (GFM) powers changelogs, README files, and product docs. This viewer lets you edit, preview, and share Markdown from any browser without setting up a repo.

Live preview workflow

The editor accepts Markdown on the left and renders a styled preview on the right. It supports tables, task lists, strikethrough, callouts, and fenced code blocks so you can mirror GitHub output exactly.

Toggle between light and dark preview themes to ensure colors, code, and typography remain legible in both environments.

Syntax helpers
Keyboard shortcuts for bold, italics, and code fences help writers stay in flow without memorizing every symbol.
Export options
Copy rendered HTML or download the Markdown source for quick sharing with teammates.

Ideal for collaborative notes

Engineers drop in release notes, product managers capture meeting minutes, and support teams craft knowledge-base articles. Because everything runs client-side, you can safely draft sensitive docs before publishing them to version control.

Use the preview pane to check anchor links, verify heading hierarchy, and ensure tables stay readable on mobile screens.

Diff-friendly output
Combine the viewer with Diff Checker to review editorial changes before merging PRs.
Embed testing
Render images, Mermaid diagrams, or code fences to confirm GitHub and docs platforms will accept them.

Popular uses

Changelog drafts

Preview release entries before publishing them to your status page.

README polish

Ensure badges, tables, and nested lists look great for new contributors.

Support docs

Author tutorials with headings, callouts, and checklists that match your CMS output.

Incident write-ups

Capture timelines with code snippets and bullet lists without opening a full IDE.

Next step

Visualize diagrams inside Markdown

Jump to the Mermaid Viewer to generate flowcharts or sequence diagrams, then embed them back into your Markdown via fenced blocks.

Open Mermaid Viewer

Popular combinations

Audit with Diff Checker
Compare Markdown Viewer output with previous revisions to avoid regressions.
Share via QR Code Generator
Turn sanitized payloads into QR codes for offline reviews.

Frequently asked questions

What is Markdown?

Markdown is a lightweight markup language that you can use to add formatting elements to plain text text documents. It is widely used for README files, documentation, and forum posts.

Does this viewer support GitHub Flavored Markdown (GFM)?

Yes. Our viewer supports GFM, which includes tables, task lists, strikethrough, and auto-linked URLs, ensuring your content looks exactly like it would on GitHub.

Can I export the rendered HTML?

Currently, this tool focuses on previewing. However, you can easily copy the rendered content from the preview pane.

Is my content private?

Yes. All Markdown rendering is performed client-side in your browser. We do not store or see your documents.

How to use Markdown Viewer

Follow these four quick steps to inspect markup or diagrams with instant previews right inside your browser—no downloads, no accounts, and no data leaving the FreeTools.run sandbox.

Step 1: Load your source data
Paste text, drag a file, or start with our curated sample to understand how the viewer workflow behaves with real inputs.
Step 2: Adjust tool options
Toggle presets, update formatting rules, or choose export preferences. All controls update in real time so you can preview the effect before committing.
Step 3: Review the live preview
Use the split-pane preview, inline validation, or diff output to confirm the transformation looks correct before you copy anything back into your project.
Step 4: Export or chain another tool
Copy the result, download a file, or jump into a related FreeTools.run utility (like Diff Checker or the QR Code Generator) to continue the workflow without leaving the browser.