Markdown Viewer — Live Preview

What is the Markdown Viewer?

You have a README, a set of release notes, or a doc someone sent you as a .md file, and you want to read it the way it was meant to be read — headings sized properly, tables lined up, code in a monospace block. Opening it in a text editor gives you the raw syntax. Pushing it to a repository just to look at it is a slow way to answer a quick question. This viewer renders it as you paste it, and nothing leaves your browser while you do.

Markdown started as John Gruber's 2004 project and has since been pinned down by the CommonMark specification, which this viewer follows for the core syntax. On top of that it handles the GitHub Flavored Markdown extensions people actually use every day: pipe tables, task lists, strikethrough, and fenced code blocks with a language hint.

Rendering happens in the page itself, so there is no upload step and no copy sitting on a server somewhere. If you want to confirm a file looks the same somewhere else before you publish it, opening it in a second online markdown viewer is a quick way to catch a flavor difference — parsers disagree more often than you would expect, particularly around nested lists.

How to Use the Markdown Viewer

1. Paste Your Markdown – Drop your Markdown into the left panel. The preview on the right updates as you type, so there is no button to press.
2. Or Upload a File – Use the Upload button to open a .md or .markdown file straight from your computer. It is read locally by your browser.
3. Read the Preview – Headings, lists, tables, links, images, blockquotes, and fenced code blocks all render on the right the way a Markdown renderer would show them.
4. Copy the HTML – Click Copy to put the generated HTML on your clipboard, ready to paste into a CMS, an email template, or a static site.
5. Download the Output – Hit Download to save the rendered HTML as a file you can open in any browser or hand to someone without a Markdown tool.

Pro Tip: Pipe tables need a separator row of dashes directly under the header row, and a blank line before the table. Miss either one and most parsers quietly render the whole thing as a paragraph.

Example

A short release note with a heading, a task list, and a pipe table becomes formatted output. Note how the table separator row sets the column alignment.

# Release 2.4.0

Shipping the table view everyone kept asking for.

## Highlights

- [x] Sortable columns
- [ ] Saved views

| Change     | Area   | Breaking |
| :---       | :---:  |     ---: |
| Table view | Viewer | No       |
| New parser | Core   | Yes      |

Common Use Cases

Reading a README Before You Clone

Someone links you a repository and you want to know what the project does before you spend time on it. Paste the README contents here and read it properly formatted, with the install commands in code blocks and the badge table laid out, instead of squinting at raw pipes and asterisks.

Checking a Table Before You Commit

Pipe tables are the single most common thing to get wrong in Markdown. A missing separator row or an uneven pipe count turns a table into a run-on paragraph. Paste it here first and you will see immediately whether the columns landed where you intended.

Reviewing Documentation Written by Someone Else

Docs arrive as .md attachments all the time. Rather than installing an editor to read one file, open it here. Since the rendering runs in your browser, internal documentation never travels anywhere, which matters when the file is not yours to upload.

Converting Notes into HTML

Notes written in Markdown often need to end up somewhere that wants HTML — a CMS field, a newsletter, a help centre article. Paste the Markdown, copy the HTML, and move on. For data-shaped content, our JSON to Table converter handles the structured side of the same problem.

Key Features

• Live rendering — the preview follows your typing, with no convert button and no page reload.
• GitHub Flavored Markdown — pipe tables, task list checkboxes, strikethrough, and autolinks all render.
• Fenced code blocks — triple-backtick blocks keep their formatting and monospace font.
• Runs in your browser — the document is parsed locally, so nothing is uploaded or stored.
• File upload — open a local .md or .markdown file without pasting.
• Copy or download the HTML — take the rendered output somewhere else in one click.

Frequently Asked Questions

Is my document sent anywhere?

No. Parsing and rendering both happen in your browser using JavaScript. You can open your browser's network tab and watch — nothing is uploaded while you use the viewer.

Which Markdown flavor does it follow?

CommonMark for the core syntax, plus the GitHub Flavored Markdown extensions — tables, task lists, strikethrough, and autolinks. If a construct renders on GitHub, it will almost certainly render here.

Why does my table render as a paragraph?

Almost always one of two things: there is no separator row of dashes under the header, or there is no blank line between the preceding paragraph and the table. Both are required by the GFM tables extension.

Can I use raw HTML inside my Markdown?

Markdown allows inline HTML, and common formatting tags render normally here. Scripts and event handlers are stripped before the preview is displayed, so a document you did not write cannot run code in your browser.

Can I open a local .md file?

Yes. Click Upload and pick a .md or .markdown file. Your browser reads it directly from disk — the file is never transmitted.

Related Tools

• JSON to Table – Turn a JSON array into a sortable, filterable table you can actually read.
• JSON Formatter – Indent and tidy minified JSON before you paste it into documentation.
• JSON to CSV – Flatten a JSON array into comma-separated values for a spreadsheet.
• JSON Tree Viewer – Expand and collapse deeply nested JSON one branch at a time.
• XML to Table – The same table view for XML documents.

Useful Resources

• Markdown Guide – The reference most people end up bookmarking — every element with an example beside it.
• MDN HTML Reference – Worth a look when you want to know what your Markdown actually turned into.