View and Preview Markdown Files Online – Open a .md File Instantly
Paste Markdown and the preview appears as you type — no install, no account, no upload. Open a .md file from your computer, edit it beside a safely sanitized preview, then copy or download the Markdown, or export the rendered result as a complete HTML file.
The rendered preview appears here as you type or open a file.
What this Markdown preview tool does
Writers, developers and students keep notes, README files and documentation in Markdown. A raw Markdown file is hard to read, and installing a desktop editor just to check one file is overkill. This viewer gives you a side-by-side editor and live preview: type or paste Markdown on the left, read the formatted result on the right. Use it to view MD files the moment one lands in your inbox or a repository — a README, class notes, a dataset description — without installing anything. When the document looks right, take the Markdown with you or export a standalone HTML page.
How to use it
How to open an MD file
Open Markdown files in one click: press Open .md file above and pick any .md, .markdown or .txt file from your computer. The file is read locally in your browser and appears in the editor with the live preview beside it. Nothing is uploaded, and there is no app to install — the page doubles as an .md file viewer on any laptop, phone or locked-down machine.
How to preview Markdown online without installing anything
Getting a Markdown preview online takes seconds and installs nothing: paste your text into the editor and read the rendered document on the right. The preview follows CommonMark and GitHub-Flavored Markdown, updates as you type, and is sanitized so scripts and unsafe links never run. Because everything happens in your browser, it works even on machines where you cannot install software.
Input and output
Input: any CommonMark or GitHub-Flavored Markdown (tables, task lists, strikethrough, fenced code), up to 1,000,000 characters. Output: the original Markdown, a sanitized HTML fragment, or a complete standalone HTML document with clean typography.
How to view a CSV table
Markdown tables render here, but to read a whole CSV file as a table use the CSV Viewer: open a local .csv file or paste CSV text and get a scrollable table with cell search and a header-row toggle — no spreadsheet import needed. Like this page, it runs entirely in your browser. Want to turn CSV or Excel data into a Markdown table instead? Use the Markdown Table Generator.
Security and privacy
- Files and text are processed in your browser; nothing is uploaded to a server.
- Preview, copied HTML and downloaded HTML replace images with text placeholders, so opening them does not contact image hosts.
- Inline HTML is sanitized with a strict whitelist: scripts, event attributes and unsafe links never render.
- Links only use safe protocols (http, https, mailto, relative addresses).
Limitations
- Maximum input size: 1,000,000 characters.
- No syntax highlighting inside code blocks in this version.
- No PDF export and no cloud saving — by design.
Frequently asked questions
What is a Markdown viewer?
A Markdown viewer renders .md files and raw Markdown text as formatted documents — headings, lists, tables, links and code blocks — so you can read and check them without installing an editor. This one also gives you a live preview while you type.
Which Markdown syntax is supported?
All core CommonMark syntax plus GitHub-Flavored Markdown extensions: tables, task lists, strikethrough and fenced code blocks. Syntax highlighting for code is not included in this version.
Is my document uploaded anywhere?
No. Everything is processed locally in your browser. The preview, copied HTML and downloaded HTML replace images with text placeholders, so opening a file here does not contact image hosts.
Why did my inline HTML disappear or change?
Raw HTML inside Markdown is sanitized with a strict whitelist. Scripts, event handlers (like onclick), iframes and links with unsafe addresses (such as javascript:) are removed so the preview and the exported HTML stay safe to open.
How large can my document be?
Up to 1,000,000 characters of Markdown, which covers documents of several hundred pages. Larger inputs are rejected with a clear message instead of freezing the page.
Can I export the preview as HTML?
Yes. Copy the sanitized HTML fragment, or download a standalone .html file with styling that opens directly in any browser. Images become text placeholders in both the preview and exported HTML; no remote image requests are made.
