Browser-based vs CLI — when each makes sense
The OSS gold standard for DOCX → Markdown is pandoc on the command line — free, MIT-licensed, runs locally, processes batches of files without limits. mdisbetter's online tool exists for the cases where pandoc isn't the right fit: you're on a tablet or Chromebook without dev tooling, you're a non-technical user who doesn't want to install command-line software, you need conversion done in seconds without a setup step, you want a polished UI and clean Markdown output without tweaking pandoc flags.
What "online" means here
The conversion runs on mdisbetter's servers (DOCX parsing is too heavy to ship to every browser tab), but no software lands on your machine — open the page, drop the file, download the result. Works on Mac, Windows, Linux, ChromeOS, iOS, Android. Files are processed in memory and deleted immediately after conversion. No storage, no logs.
The full converter
Head to Word to Markdown for the actual upload UI. Free tier covers most personal use; Pro adds batch upload, larger file sizes, and API access.