📰Markdown Preview Online - Markdown to HTML Tool

How to use Markdown Preview

1. 1Type Markdown on the left, or paste in the contents of a .md file
2. 2The preview on the right updates as you type
3. 3When you need HTML, switch to HTML source and click Copy HTML

FAQ

Which syntax is supported?

Standard Markdown plus the GitHub Flavored Markdown (GFM) extensions: headings 1 to 6, bold, italic, strikethrough, inline code, ordered and unordered lists, task lists (- [x] and - [ ]), blockquotes, horizontal rules, images, links, automatic links, tables (with :-- and --: for alignment) and fenced code blocks. Footnotes ([^1]), math ($...$), emoji shortcodes (:smile:) and syntax highlighting in code blocks are not supported yet; they show up as plain text.

Why do line breaks look different from GitHub?

This tool shows a single line break inside a paragraph as a line break, the way GitHub comments and issues do, which feels more natural while writing. When GitHub displays a README or other .md file, though, a single line break counts as a space: you need a blank line for a new paragraph, or two trailing spaces for a line break. So a README preview here may show more line breaks than GitHub does; if you separate paragraphs with blank lines, both look the same.

How do I use the copied HTML?

You get plain HTML tags such as <h2>, <p> and <table>, with no styling. Pasted into a web page or the HTML mode of a blog editor, it picks up that site's own styles; for email or anywhere that needs a fixed look, add your own CSS. A sample with a table and a code block, for instance, comes out as <table> and <pre><code> tags.

Is it safe to paste Markdown written by someone else?

Yes. Markdown can contain raw HTML, and a document from elsewhere may hide code that runs on its own, such as <img onerror>, <script> or javascript: links. This tool filters the output before showing it: scripts, event attributes, javascript: links, <style> and <form> are removed, while tables, images, task lists and colored text display as normal. The HTML you copy is the filtered version too.

Does it slow down on long documents?

We measured it in the browser: a 1,500-line document (19 KB) renders in about 0.08 seconds, and a 15,000-line one (190 KB) with 1,000 tables and 1,000 code blocks in about 0.5 seconds. Up to a few thousand lines you will not notice any delay; very long documents re-render on every keystroke and can feel sluggish, so preview them in sections.

Is my text kept after I close the page?

No. To avoid leaving your content on the computer, the tool does not save what you type; refreshing or closing the page clears it. For long documents, write in your editor and paste here, or use a tool that saves automatically, such as Online Notepad.

Do I need to sign up or pay?

No. The site is completely free, needs no account and has no usage limits; your text is processed only in your browser and never uploaded.