Markdown Previewer
Preview Markdown and view .md files directly in your browser. Render headings, tables, task lists, links, and code blocks with private local processing.
Your Markdown is processed locally in your browser and is never uploaded for previewing.
Release to load file
Accepted uploads: .md, .markdown, or .txt, up to 5 MB. Drag a file onto the editor, or use Upload File.
Formatting look inconsistent? Clean Markdown →
Your Markdown preview will appear here.
What Is a Markdown Previewer?
Markdown is plain text that uses lightweight formatting syntax — characters like #, *, and - — to represent structure such as headings, emphasis, lists, links, and tables. On its own, that syntax is easy to write but not especially easy to read at a glance.
A Markdown previewer renders that syntax into a formatted, readable document so you can see how headings, lists, tables, and code blocks will actually look before you publish or share the file.
How to Preview Markdown
Step 1
Paste or upload Markdown
Paste Markdown directly into the editor, or upload a .md, .markdown, or .txt file to view it.
Step 2
Edit your Markdown
Make changes directly in the editor. Your source Markdown is never rewritten automatically.
Step 3
Review the live preview
Check headings, tables, lists, links, and code blocks in the rendered view, then copy or download the Markdown source if needed.
Preview and View Markdown Files
MarkForge works as a Markdown previewer for pasted or typed source, rendering the syntax into a formatted view as you type.
It also works as a Markdown viewer for local files: upload a .md, .markdown, or .txt file and MarkForge renders its structure so you can review headings, tables, lists, and code without leaving your browser. Because Markdown files commonly use the .md extension, MarkForge also functions as a simple browser-based .md file viewer.
The rendered pane shows how the Markdown structure will appear, while the source stays fully visible and editable alongside it, so you can move between viewing and editing.
Markdown Features Supported
MarkForge's Markdown previewer supports headings (H1–H6), bold and italic text, strikethrough, ordered and unordered lists, task lists, links, blockquotes, tables, inline code, fenced code blocks, horizontal rules, and autolinks (bare URLs are automatically turned into clickable links).
This covers the Markdown features used in most documentation, READMEs, and notes. Fenced code blocks preserve whitespace in a monospace font but are not syntax-highlighted. See the FAQ below for details on GitHub-Flavored Markdown support and how images and raw HTML are handled.
Markdown Preview vs. Markdown Editor
The editor is where you work with the raw Markdown syntax — the plain-text source, exactly as it will be saved to a .md file.
The preview is the formatted, rendered result of that syntax — what a reader would see once the Markdown is displayed as a document. MarkForge keeps both visible side by side (or in separate tabs on smaller screens) so you can compare the two as you write.
Why Preview Markdown Before Publishing?
Markdown syntax is simple, but small mistakes are easy to miss when reading raw source — a missing blank line before a list, an unclosed code fence, or a heading level that's off by one. Previewing catches these formatting mistakes, lets you check heading hierarchy, verify that lists and tables render the way you expect, and confirm links and task lists look correct.
This matters for documentation and README files that other people will read, for note-taking systems that render Markdown, and increasingly for reviewing AI-generated Markdown before it goes into a publishing workflow, a wiki, or a repository.
Safe Markdown Previewing
Raw HTML embedded in Markdown — such as a <script>, <iframe>, or <form> tag — is not executed as live page content. It is parsed as inert text and passed through a strict sanitizer before it reaches the preview, so scripts, iframes, forms, and inputs never become active elements on the page.
Links that use javascript:, vbscript:, or data: destinations are not turned into clickable links in the preview. Ordinary http and https links open safely in a new tab. These protections are part of how MarkForge previews Markdown and are not a guarantee against every possible input.
Preview Markdown Before Using It
Previewing is also a quick way to confirm a document's structure before it moves into another workflow — checking headings, tables, lists, and code blocks so you know what you're working with.
This is especially useful after cleaning or restructuring Markdown. If you've just run a document through the Markdown Cleaner, previewing the result confirms the formatting held up. Before splitting a long document with the Markdown Chunker or checking it against a model's context window with the AI Token Counter, previewing it first helps confirm the structure is correct.
Private by Design
Markdown preview rendering happens locally in your browser. Pasted Markdown, uploaded files, and the rendered preview are not sent to a MarkForge preview server or any third-party rendering API.
Remote images referenced in Markdown — such as  — are intentionally not automatically loaded. MarkForge shows the image's alt text and URL as plain text instead of fetching it, so previewing Markdown never triggers a request to a third-party host. For additional details, see the MarkForge Privacy Policy.
Related Tools
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Convert PDF files into clean, structured Markdown directly in your browser.
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HTML to Markdown Converter →
Convert HTML source or HTML files into clean Markdown directly in your browser.
AI Token Counter →
Count tokens, words, and characters and compare text against an AI context window.
Markdown Chunker →
Split large Markdown documents into structured chunks for AI, RAG, and knowledge-base workflows.
Markdown Cleaner →
Clean and normalize Markdown formatting while preserving document structure.
Frequently Asked Questions
What is Markdown?
Markdown is a lightweight plain-text formatting system. It uses simple characters to represent structure such as headings, lists, links, emphasis, tables, and code, while remaining easy to read as plain text.
What is a Markdown previewer?
A Markdown previewer renders Markdown syntax into a formatted, readable document, so you can see headings, lists, tables, and other structure the way a reader would see them, without leaving the raw syntax unformatted.
What is a Markdown viewer?
A Markdown viewer renders Markdown source into a readable formatted view so you can inspect headings, lists, tables, links, code, and other supported Markdown elements. MarkForge works as both a Markdown viewer for local files and a Markdown previewer for pasted or typed source.
How do I preview a Markdown file?
Paste your Markdown into the editor, or upload a .md, .markdown, or .txt file. The formatted preview updates automatically as you type or edit.
Can I open a .md file in MarkForge?
Yes. MarkForge accepts .md, .markdown, and .txt files up to 5 MB, read entirely in your browser using the File API, and renders the file's Markdown so you can view its structure. You can also drag and drop a file onto the editor.
Does MarkForge support Markdown tables?
Yes. Pipe-style Markdown tables are rendered with headers and borders, and wide tables scroll horizontally inside their own panel instead of overflowing the page.
Does MarkForge support task lists?
Yes. Task-list syntax such as - [ ] To do and - [x] Done renders with checkboxes in the preview. These checkboxes are for display only — clicking one does not change your source Markdown.
Does MarkForge support fenced code blocks?
Yes. Fenced code blocks (using triple backticks) render with preserved whitespace and a monospace font, and scroll horizontally within the code block if a line is too long for the panel.
Can MarkForge preview GitHub Markdown?
MarkForge supports many common GitHub-Flavored Markdown conventions, including tables, strikethrough, task lists, and fenced code blocks. It is not guaranteed to produce pixel-perfect, identical output to GitHub's own renderer for every edge case.
Does MarkForge execute HTML inside Markdown?
No. Raw HTML embedded in Markdown is treated as inert text rather than executed as active HTML. This is a security measure that prevents scripts, iframes, forms, and other embedded HTML from becoming active elements inside the preview.
Does MarkForge load images from my Markdown?
No. Image syntax such as  is represented safely as text — showing the alt text and the URL — but the image itself is never fetched, preloaded, or displayed. This keeps previewing Markdown from contacting a third-party host.
Does MarkForge upload my Markdown?
No. Pasted Markdown and uploaded files are rendered locally in your browser and are not sent to a MarkForge server or any third-party API for previewing.
Can I edit Markdown before downloading it?
Yes. The editor is fully editable. The Copy Markdown and Download .md actions always use the exact current contents of the editor.
Is the Markdown Previewer free?
Yes. The Markdown Previewer is free to use and does not require an account.