Add Article Studio to the tool directory

_tools/article-studio.md

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+---
+title: Article Studio
+category: "online editor"
+description: "Article Studio converts Markdown into X (Twitter) Articles."
+icon: article-studio.png
+website: https://md2xarticle.com
+syntax:
+  - id: headings
+    available: p
+    notes: "The first H1 becomes the article title. X Articles has two body heading levels; H4–H6 are shown as the lower level with a warning."
+  - id: paragraphs
+    available: y
+  - id: line-breaks
+    available: y
+  - id: bold
+    available: y
+  - id: italic
+    available: y
+  - id: blockquotes
+    available: y
+    notes: "Simple text quotes. Move tables, images and diagrams out of quotes."
+  - id: ordered-lists
+    available: y
+    notes: "Single-level lists. Simple nested lists can be converted to one level."
+  - id: unordered-lists
+    available: y
+    notes: "Single-level lists. Simple nested lists can be converted to one level."
+  - id: code
+    available: p
+    notes: "The text is kept, but X Articles does not show inline code in a monospace font."
+  - id: horizontal-rules
+    available: y
+  - id: links
+    available: p
+    notes: "Absolute URLs and mailto links work. Relative links are flagged and must be made absolute."
+  - id: images
+    available: y
+    notes: "PNG, JPEG and WebP. Select the image folder once so local paths can be matched."
+  - id: tables
+    available: y
+    notes: "Kept as a native Markdown table in the X draft, or rendered as a PNG image."
+  - id: fenced-code-blocks
+    available: y
+  - id: syntax-highlighting
+    available: n
+    notes: "The language tag is kept. X controls how code blocks are displayed."
+  - id: footnotes
+    available: n
+    notes: "Flagged so they can be rewritten as links or endnotes."
+  - id: heading-ids
+    available: n
+  - id: definition-lists
+    available: n
+  - id: strikethrough
+    available: y
+  - id: task-lists
+    available: p
+    notes: "Converted to ordinary bullets with a warning; the checked state is not kept."
+  - id: emoji-cp
+    available: y
+  - id: emoji-sc
+    available: n
+  - id: highlight
+    available: n
+  - id: subscript
+    available: n
+    notes: "Single tildes are treated as strikethrough."
+  - id: superscript
+    available: n
+  - id: auto-url-linking
+    available: y
+  - id: disabling-auto-url
+    available: n
+  - id: html
+    available: n
+    notes: "Line breaks and comments are normalized. Other raw HTML is flagged so content is not dropped silently."
+---
+
+[Article Studio](https://md2xarticle.com) is a free, browser-based editor for publishing Markdown as an X (formerly Twitter) Article. Paste or import a Markdown file, preview how it will look, then copy the formatted title and body or create an unpublished X draft with the free Chrome companion.
+
+X Articles doesn't accept Markdown directly, so Article Studio converts it. Tables can stay native or become PNG images, Mermaid code blocks are rendered as PNG images, and local images are matched after you select their folder. Anything that would lose content, like footnotes or raw HTML, is flagged with a link to the source line instead of being dropped.
+
+{% include image.html file="/assets/images/tools/article-studio.png" alt="Article Studio Markdown to X Articles editor" %}
+
+Articles and images are prepared and saved in your browser. They're sent to X only when you confirm draft creation in the companion. Your X account needs access to Articles.
+
+{% include tool-syntax-table.html %}