String & Formatting

Markdown Previewer

Live GitHub-flavored Markdown editor and HTML previewer with DOMPurify sanitization and export.

How It Works & Methodology

Markdown is a lightweight markup language designed for plain-text readability and formatting. This browser previewer parses GitHub Flavored Markdown (GFM) using marked@18.1.2 and sanitizes the output with DOMPurify, neutralizing XSS vectors like malicious scripts, javascript: protocol links, and event attributes.

Markdown text -> marked.parse(markdown) -> DOMPurify.sanitize(rawHtml) -> Safe Browser DOM Malicious elements (<script>, <style>, <iframe>, event handlers) are stripped before rendering.

Key Assumptions & Scope:

GFM table syntax and line-breaks are enabled by default.
Rendered output is strictly filtered against Cross-Site Scripting (XSS) payloads.
Processing executes entirely in-memory on the client without uploading content.

Frequently Asked Questions

Is this Markdown previewer safe against XSS attacks?

Yes. All parsed HTML is passed through DOMPurify with strict profile configurations that strip script tags, iframe embeds, object tags, and event handlers like onerror or onclick.

Does this editor support tables and task lists?

Yes. GitHub Flavored Markdown (GFM) tables, lists, strikethrough text, and blockquotes are fully supported.

Can I copy the generated raw HTML?

Yes. Click the "Copy HTML" button to copy the clean, sanitized HTML markup to your clipboard for use in blogs, emails, or CMS platforms.