Markdown Previewer
TextPaste Markdown and see a live, rendered preview instantly — headings, bold, links, lists, and tables. Runs entirely in your browser, nothing is uploaded.
Rendered Preview
What is a Markdown?
A Markdown Previewer takes raw Markdown text — the lightweight formatting syntax used in README files, GitHub comments, and countless documentation tools — and instantly renders it as the formatted output it represents. Headings, bold and italic text, links, lists, and tables all appear exactly as they would once published, without needing to actually publish anything first.
Markdown is deliberately readable in its raw form, but subtle mistakes — an unclosed bold marker, a list that doesn't quite indent correctly, a table with a misaligned separator row — are much easier to catch visually than by reading the raw syntax. The Markdown Previewer closes that gap, showing you the real rendered result as you type. If you're working with other structured text formats, the JSON Formatter and other thecalcu.com formatters cover related transforms.
How to use this Markdown calculator
- Paste or type your Markdown into the Markdown input box, replacing the example text shown by default.
- Watch the Rendered Preview below update instantly as you type — there's no separate render button.
- Check headings, bold/italic text, links, and lists render the way you expect.
- If something looks wrong, adjust the raw Markdown syntax and watch the preview update again immediately.
- Once you're happy with the result, copy your finalised Markdown text into its destination (GitHub, a CMS, documentation).
Formula & Methodology
The tool parses your Markdown using a GitHub-flavoured Markdown (GFM) parser, which converts the raw syntax into HTML following the same rules GitHub itself uses, then sanitises that HTML to strip any unsafe tags or attributes before displaying it — a necessary safety step for any tool that renders user-supplied content directly in a browser.
Before (raw Markdown):
# Hello This is **bold** and this is a [link](https://thecalcu.com).
After (rendered): a heading reading "Hello", followed by a paragraph where "bold" appears in bold text and "link" appears as a clickable hyperlink pointing to thecalcu.com.Frequently Asked Questions
What is Markdown?
Markdown is a lightweight text formatting syntax that uses plain punctuation — asterisks for bold, hashes for headings, dashes for lists — to mark up text that renders as formatted HTML. It's the standard format for README files, GitHub comments, technical documentation, and many blogging and note-taking tools because it stays readable even before it's rendered.
What does a Markdown previewer do?
A Markdown previewer takes raw Markdown text and instantly renders it as the formatted HTML it represents — headings appear as headings, **bold** text appears bold, links become clickable, and lists render as actual bulleted or numbered lists. This lets you check exactly how your Markdown will look before publishing it somewhere.
How do I preview my Markdown?
Paste or type your Markdown into the input box and the rendered preview below updates instantly as you type — there's no separate "render" button to click.
What Markdown syntax does this tool support?
This tool supports GitHub-flavoured Markdown (GFM), including headings, bold and italic text, links, ordered and unordered lists, blockquotes, inline code, code blocks, and tables — the same syntax used by GitHub, GitLab, and most modern documentation tools.
Is my Markdown uploaded anywhere?
No. Rendering happens entirely inside your browser — nothing you type is sent to a server, logged, or stored, even if you're previewing an unpublished document or private notes.
Does this work offline?
Yes — once the page has loaded, rendering runs entirely client-side with no further network requests, so it continues to work without an internet connection.
Why doesn't my HTML or script tag show up in the preview?
The preview sanitises the rendered output to strip potentially unsafe HTML and scripts, which is standard practice for any tool that renders user-supplied content. If you need raw HTML embedded in your output, most Markdown-consuming platforms (like GitHub) have their own rules about which HTML tags they allow through, so check the target platform's documentation.
Can I preview a table in Markdown?
Yes — GitHub-flavoured Markdown tables (using pipes `|` and a header separator row of dashes) render as proper HTML tables in the preview, so you can confirm column alignment and content before publishing.
Why would I use this instead of my code editor's built-in preview?
Not every editor has a built-in Markdown preview, and switching context to a browser-based tool is often faster when you're writing a GitHub comment, a forum post, or documentation directly in a web form that doesn't support live preview itself.
Does this support nested lists and blockquotes?
Yes — indenting list items renders proper nested sub-lists, and lines starting with `>` render as blockquotes, including multiple levels of nested quoting.
What's the difference between this and a full Markdown editor?
This tool focuses specifically on the preview step — paste Markdown, see the rendered result — rather than providing a full editing environment with syntax highlighting, file management, or export options. It's built for quickly checking how a piece of Markdown will render, not for long-form writing.