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Bidirectional HTML and Markdown converter with GitHub Flavored Markdown, tables, live preview, and customizable output styles
Convert images between PNG, JPG, WebP, AVIF, BMP formats. Features quality control, transparency support, and batch conversion for efficient workflow.
Create Markdown tables with a visual editor. Add columns, rows, set alignment, and export perfectly formatted tables.
Full-featured Markdown editor with live preview supporting GitHub Flavored Markdown syntax, comprehensive formatting options, and export capabilities. Markdown has become the standard format for technical documentation, README files, and content creation due to its simplicity and readability, yet writing Markdown without preview feedback is challenging. This tool provides real-time side-by-side preview as you type, showing exactly how your Markdown will render before publishing or sharing. Support for GitHub Flavored Markdown (GFM) including tables, task lists, strikethrough, and fenced code blocks ensures compatibility with platforms like GitHub, GitLab, and modern documentation sites. The automatic table of contents generation, syntax highlighting with multiple themes, and export to both HTML and PDF formats make this editor suitable for documentation, blog posts, technical writing, and content creation across all platforms.
Write and preview project README files with tables, code blocks, and formatting that will render correctly on GitHub and GitLab.
Create comprehensive technical documentation with tables, code blocks, automatic TOC generation, and export to HTML for documentation sites.
Draft blog posts with live preview, ensuring formatting and structure are correct before publishing to blogging platforms.
Take notes in Markdown format with live preview, creating organized, searchable notes that can be easily converted to documents.
Write technical guides, tutorials, and how-to articles with code examples, syntax highlighting, and proper formatting verification.
Create content for static site generators and documentation platforms that use Markdown as the source format.
Markdown was created by John Gruber in collaboration with Aaron Swartz and released on March 19, 2004. Gruber's design philosophy was explicit: Markdown should be readable as plain text without rendering, using formatting conventions that people already used intuitively in plain-text email. The original implementation was a Perl script that converted Markdown to HTML, and Gruber described it as "a text-to-HTML conversion tool for web writers" that lets you "write using an easy-to-read, easy-to-write plain text format."
The name "Markdown" is a deliberate play on "markup" — it is a simplified markup language that strips away the complexity of HTML while retaining its expressive power for common formatting tasks. Gruber's original specification was intentionally informal, described in a blog post rather than a formal standard. This informality led to a significant problem: ambiguity. Different Markdown implementations made different choices about edge cases — how nested lists should work, whether blank lines are required before block elements, how emphasis interacts with punctuation — resulting in documents that rendered differently across parsers.
This fragmentation led to the CommonMark initiative, launched in 2014 by a group including Jeff Atwood (Stack Overflow co-founder) and John MacFarlane (creator of Pandoc). CommonMark provides a rigorous specification with over 600 examples defining exact behavior for every edge case. The specification took years to develop because seemingly simple questions — like "does `*foo*bar*` produce one or two emphasized spans?" — required careful analysis of user expectations and compatibility. As of 2024, CommonMark is at version 0.31.2 and serves as the foundation for GitHub Flavored Markdown, GitLab, Reddit, and many other platforms.
Markdown parsers typically operate in two phases. The first phase (block parsing) identifies structural elements: paragraphs, headings, code blocks, lists, and block quotes. This is done line-by-line, using indentation and prefix characters (# for headings, > for block quotes, - for list items) to determine block boundaries. The second phase (inline parsing) processes text within blocks to identify emphasis (*bold*, _italic_), links, code spans, and other inline formatting. This two-phase architecture explains why block-level elements (headings, code blocks) cannot contain certain other block elements and why some nesting combinations behave unexpectedly.
GitHub Flavored Markdown (GFM), specified as a strict superset of CommonMark, adds extensions critical for software development: tables (using pipe syntax), task lists (checkbox syntax), strikethrough (~~text~~), autolinked URLs, and fenced code blocks with language-specified syntax highlighting. GFM's table syntax, while widely adopted, has notable limitations — it cannot express colspan, rowspan, or cell-level formatting, which is why complex tables still require raw HTML in Markdown documents.
GFM is an extension of standard Markdown used on GitHub. It adds support for tables, task lists (checkboxes), strikethrough text, fenced code blocks with syntax highlighting, and automatic URL linking.
The preview supports multiple built-in themes that change the styling. You can switch between themes to see how your Markdown will look in different contexts, such as light or dark modes.
Use triple backticks (```) followed by the language name, e.g., ```javascript. Close the block with another set of triple backticks. The preview will automatically apply syntax highlighting for the specified language.
Yes, you can export your rendered Markdown as both HTML and PDF. The exported file preserves all formatting, including headings, tables, code blocks, and images referenced by URL.
All processing happens directly in your browser. Your files never leave your device and are never uploaded to any server.