TOOLGENIEFree Markdown Previewer — Live Markdown Editor Online
Write or paste Markdown, preview GitHub Flavored Markdown instantly, and convert to HTML — 100% private in your browser.
How to Use the Markdown Previewer / Editor
- Type or paste Markdown in the left editor pane — or open a
.mdfile from disk (drag-and-drop works too). - Watch the live preview on the right update as you type. Toggle Split / Editor / Preview for mobile-friendly layouts.
- Use the toolbar for bold, italic, headings, links, lists, tables, and quotes — or write raw GitHub Flavored Markdown.
- Convert Markdown to HTML with Copy HTML or Download .html when you need output for docs, blogs, or emails.
- Keep drafting privately — your content stays in the browser and can autosave to localStorage until you clear it.
About This Free Markdown Previewer
A Markdown previewer (also called a Markdown editor online or Markdown viewer) helps you write READMEs, docs, and notes without guessing how formatting will look. Paste Markdown, see rendered HTML instantly, and export when you are ready.
This tool focuses on the workflow most people need: a fast live Markdown preview, GitHub Flavored Markdown support (tables, task lists, fenced code, strikethrough), and private Markdown to HTML conversion — without cloud accounts or sync complexity.
Pair it with the text diff checker to compare Markdown drafts, the JSON editor for structured data, the word & character counter for length checks, the case converter for heading casing, the lorem ipsum generator for placeholder copy, or the meta tag generator when publishing pages written from Markdown.
GitHub Flavored Markdown Cheat Sheet
| Need | Markdown | Notes |
|---|---|---|
| Heading | ## Section title | Use # through ###### |
| Bold / italic | **bold** · *italic* | Also works with underscores |
| Link | [label](https://…) | Prefer descriptive labels |
| Task list | - [x] done · - [ ] todo | GFM checklist syntax |
| Table | | a | b | with --- separator | Great for README feature grids |
| Code fence | ```ts … ``` | Language tag enables highlighting |
| Strikethrough | ~~old text~~ | Common in changelogs |
Frequently Asked Questions (FAQ)
What is an online Markdown previewer?
An online Markdown previewer is a browser tool that lets you write or paste Markdown on one side and see the formatted HTML preview instantly on the other — no install or signup required.
Does this Markdown editor support GitHub Flavored Markdown (GFM)?
Yes. It previews GitHub Flavored Markdown features commonly used in READMEs and issues, including tables, task lists, strikethrough, and fenced code blocks with syntax highlighting.
Can I convert Markdown to HTML online?
Yes. Edit in the Markdown pane, then copy the rendered HTML or download an .html file for docs, blogs, emails, or static site drafts.
Can I open and view a .md file in my browser?
Yes. Upload or drag a Markdown (.md) file into the editor to preview it as an MD file viewer without installing a desktop app.
Is my Markdown private when I use this tool?
Yes. Parsing and preview run entirely in your browser with client-side JavaScript. ToolGenie does not upload or store your Markdown content on a server. Drafts can optionally persist in your browser’s localStorage.
How is this Markdown previewer different from Dillinger or StackEdit?
Dillinger and StackEdit are full workspaces with cloud sync and extras. This tool focuses on a fast, private live Markdown preview and Markdown-to-HTML export for quick README and docs checks — no account required.
Does the preview sanitize HTML for security?
Yes. Rendered HTML is sanitized before display so raw script tags and dangerous attributes (for example onerror handlers) are stripped, reducing XSS risk when previewing untrusted Markdown.
Can I export Markdown or print to PDF?
You can download your source as a .md file or the rendered output as .html. To save a PDF, open the preview and use your browser’s Print dialog → Save as PDF.
Tips for Better Markdown Previews & Docs
- Preview as you write READMEs. Tables and task lists are easy to break — catch mistakes before you push to GitHub.
- Prefer fenced code with a language tag so syntax highlighting stays readable in the preview and on GitHub.
- Keep one canonical doc page. Avoid near-duplicate Markdown→HTML microsites that dilute SEO — one strong previewer page is enough.
- Sanitize untrusted Markdown. This preview strips script injection; still treat downloaded HTML carefully before embedding elsewhere.
- Export HTML, then style later in your site theme — or print the preview to PDF from the browser when you need a snapshot.
- Need a checksum for a shared Markdown file? Try the hash generator or encode snippets with the Base64 encoder/decoder.