Online Markdown Viewer & Previewer

What is a Markdown Viewer?

A Markdown Viewer is a tool that renders raw Markdown text into formatted HTML output, showing headings, bold and italic text, links, code blocks, tables, and more. Our online Markdown Viewer runs entirely in your browser - no installation, no sign-up, and no data uploaded to any server.

What is GitHub Flavored Markdown (GFM)?

GitHub Flavored Markdown (GFM) is a widely used extension of standard Markdown. It adds support for tables, task lists (checkboxes), strikethrough text, and autolinks. Our viewer uses the remark-gfm plugin to fully support all GFM syntax, making it ideal for previewing README files, wiki pages, and GitHub-hosted documents.

How do I preview a Markdown file online?

Paste your Markdown text into the editor, or drag and drop a .md file onto the file upload area. The preview updates in real time. Use Split view to edit and preview side by side, Edit view to focus on writing, or Preview view to see the full rendered output.

Can I upload a .md file to preview it?

Yes. Click the file upload area or drag and drop any .md, .markdown, or .txt file. The tool reads the file locally in your browser and renders it immediately - your file is never sent to a server.

Does the Markdown Viewer support tables?

Yes. GFM-style pipe tables are fully supported, including header rows, alignment, and multi-column layouts. This makes the tool particularly useful for previewing documentation that relies on tables for structured data.

Does the Markdown Viewer support task lists and checkboxes?

Yes. GFM task list items (- [x] and - [ ]) are rendered as read-only checkboxes, matching how they appear on GitHub.

Is my Markdown content private?

Completely. All rendering happens client-side using WebAssembly and JavaScript in your browser. No text or files are transmitted to any server, making this tool safe for previewing private documentation or confidential content.

Can I use this as a README previewer?

Yes. This tool is ideal for previewing GitHub README files before committing them. Paste your README Markdown and check that tables, code blocks, headings, and GFM features render as expected.

What Markdown syntax is supported?

The viewer supports the full CommonMark spec plus GFM extensions: headings (H1-H6), paragraphs, bold, italic, strikethrough, inline code, fenced code blocks, block quotes, unordered and ordered lists, task lists, horizontal rules, links, images, and GFM tables.

How is this different from other Markdown previewers?

Our Markdown Viewer is a fast, no-dependency online tool focused on simplicity and privacy. It requires no account, no plugins, and no browser extensions. The split-pane editor lets you write and preview simultaneously, and the live character and word count helps you stay within limits for READMEs or documentation platforms.

Looking for a Markdown to HTML converter?

If you need to convert Markdown to raw HTML markup instead of previewing it, try our Markdown to HTML tool.