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MD vs SSA

MD vs SSA

A detailed comparison of Markdown and SubStation Alpha — file size, quality, compatibility, and which format to choose for your workflow.

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MD

Markdown

Documents & Text

Markdown is a lightweight markup language that uses plain text formatting syntax. It is widely used in software development, technical documentation, and content management systems.

About MD files
SSA

SubStation Alpha

Documents & Text

SSA (SubStation Alpha) is a subtitle format with styling and positioning.

About SSA files

Strengths Comparison

MD Strengths

  • Readable as plain text even before rendering — fits in version control beautifully.
  • Dead-simple: 90% of needs covered in 10 minutes of learning.
  • Converts trivially to HTML, PDF, EPUB, and DOCX via Pandoc.
  • Every modern IDE, note-taking app, and developer tool renders it natively.
  • Lightweight — a typical Markdown file is kilobytes, not megabytes.

SSA Strengths

  • Plain text format — editable in Notepad.
  • Rich styling compared to SRT (named styles, per-character formatting).
  • Universal desktop player support since the 2000s.
  • Forward-compatible — modern players open SSA as ASS.

Limitations

MD Limitations

  • No formal authoritative spec — CommonMark, GFM, and MultiMarkdown differ on edge cases.
  • Tables and complex layouts are clunky; footnotes and math require extensions.
  • Links to images stay external — no embedded media unless you base64-inline.
  • Styling is limited to what HTML allows — custom branding requires CSS outside Markdown.

SSA Limitations

  • Superseded by ASS for new content.
  • Not supported in HTML5 <video>.
  • Commercial streaming services ignore SSA.
  • Multiple implementations disagree on edge cases.

Technical Specifications

Specification MD SSA
MIME type text/markdown text/x-ssa
Extensions .md, .markdown, .mdown, .mkd —
Standard CommonMark, GitHub Flavored Markdown (GFM) —
Encoding UTF-8 (conventional) —
Companion spec RFC 7763 (2016) —
Extension — .ssa
Successor — .ass (Advanced SubStation Alpha)
Timecode precision — Centisecond (0.01s)
Authoring — Aegisub

Typical File Sizes

MD

  • README 1-15 KB
  • Blog post 2-30 KB
  • Full technical manual 50 KB - 2 MB

SSA

  • TV episode dialogue 30-90 KB
  • Anime episode with signs and songs 80-200 KB

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Frequently Asked Questions

Markdown is a lightweight text-based markup language created by John Gruber and Aaron Swartz in 2004. A .md file uses simple conventions (*italic*, **bold**, # headings, - lists) that compile to HTML. It became the default writing format for GitHub READMEs, Stack Overflow posts, Discord messages, and most developer documentation.

Markdown files are plain text — open in any text editor. For formatted preview use VS Code (built-in preview), Typora, Obsidian, or upload to GitHub/GitLab which render Markdown automatically. Every note-taking app (Notion, Bear, Joplin) handles Markdown natively.

Use KaijuConverter's Markdown-to-PDF converter, or command-line Pandoc (the gold standard — installed with one command, converts MD to PDF/HTML/DOCX/EPUB in a single line). VS Code with Markdown PDF extension also works locally.

Markdown for almost everything — it's 10× faster to write, version-control-friendly, and compiles to HTML automatically. Write raw HTML only when you need fine control over layout, embedded JavaScript, or features Markdown doesn't support (complex tables, forms). Static-site generators (Hugo, Astro, Jekyll) compile MD to HTML for you.

Markdown never had a formal spec for its first decade. CommonMark (2014) and GitHub Flavored Markdown (2017) standardized the core syntax, but edge cases (nested lists, HTML embedding, table syntax) still differ across renderers. For portability, stick to basic GFM features.

Yes — most modern doc tools are built on Markdown. MkDocs, Docusaurus, Astro Starlight, GitBook, and Read the Docs all accept Markdown input. For documentation needing rich features (tabs, callouts, versioning), MDX (Markdown + JSX components) extends MD with React-style embeds.

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