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Markdown Editor

A distraction-free, split-screen Markdown editor with real-time rendering, synchronous scrolling, Base64 image pasting, and an automated ASCII table generator.

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Category Writing & Editing
MARKDOWN
PREVIEW
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About

Writing in Markdown allows for structural precision without the bloat of rich-text editors. However, the lack of immediate visual feedback often leads to syntax errors that are only discovered post-publication. This tool bridges that gap by providing a deterministic rendering engine alongside a high-performance text editor.

We designed this environment for developers and technical writers who require ISO-compliant Markdown handling. It features a proprietary ScrollSync algorithm that maps the viewport percentage of the editor (Ve) directly to the preview pane (Vp) using the formula hcurrenthtotal - hview, ensuring context is never lost during long document reviews.

markdown editor preview converter writing

Formulas

The core rendering engine utilizes a multi-pass Regular Expression heuristic to tokenize and parse text streams. The Scroll Sync mechanism ensures alignment via:

{
ypreview = yeditor × Hpreview − vhHeditor − vhwhere vh is viewport height

This linear interpolation prevents the "drift" commonly found in inferior editors when handling images or block-level elements of varying heights.

Reference Data

ElementMarkdown SyntaxRendered Logic
Headers# H1 to ###### H6Semantic <h1>-<h6> tags
Emphasis**bold** or *italic*<strong> or <em>
Lists- Item or 1. Item<ul> or <ol>
Code`inline` or ```block```Pre-formatted text with monospace font
Links[text](url)Standard anchor tags
Images![alt](src)Embedded images (supports Base64)
Blockquote> QuoteIndented citation block
Tables| Head | ... |
| --- | ... |		HTML Table structure

Frequently Asked Questions

When you paste an image from your clipboard, the engine intercepts the DOM event, extracts the binary blob, and uses the FileReader API to convert it into a Base64 encoded string (data:image/png;base64...). This string is injected directly into your Markdown as an image source, keeping the document entirely self-contained.
The parser implements a sanitization pass that strips potentially malicious tags (like or event handlers) to prevent XSS attacks. However, for critical production environments, we always recommend a server-side validation layer (e.g., DOMPurify) as a secondary defense.
Scroll synchronization relies on percentage mapping. If the Preview pane contains elements that are significantly taller than their source Markdown (like large images or rendered diagrams), the heights diverge. Our algorithm compensates for this linearly, but extreme height differences can cause minor visual offsets.
Yes. The internal parser supports common GFM extensions including tables, task lists (- [x]), and strikethrough (~~text~~), ensuring compatibility with major platforms like GitHub, GitLab, and Bitbucket.