MarkZen is a clean, distraction-free Markdown editor for writing notes and documents on Android. Store files locally on your device or sync them via Dropbox.

【Editor】
・Formatting toolbar with one-tap insertion of Bold, Italic, Inline Code, H1–H3, Bullet list, Numbered list, Checkbox, Blockquote, Code block, Link, Indent, and Dedent
・Auto-save triggers 0.5 seconds after you stop typing
・30-step Undo / Redo
・Smart Enter continuation — automatically continues lists, checkboxes, and blockquotes
・Multi-tab editing: open up to 8 files simultaneously; reorder tabs by drag-and-drop

【Preview】
・Real-time Markdown rendering
・Supports tables, strikethrough, task lists, syntax highlighting, and heading anchor links
・WikiLinks ([[filename]]) for quick navigation between related files
・External URLs open in the browser

【Version History】
・Edit history recorded automatically
・Restore any previous snapshot with one tap

【File Management】
・Designate any folder as your managed folder and browse it as a file tree
・Create files/folders, rename, move, and copy — all within the app
・Star files as favorites for instant access from the home screen
・Home screen shows recent files and favorites at a glance
・Bulk operations: select multiple files for mass move, copy, or trash

【Dropbox Sync】
・Link your Dropbox account to save and sync files to the cloud
・Choose any Dropbox folder as your workspace
・Offline support: read and write from local cache when offline; auto-syncs on reconnect
・Conflict resolution: choose Local, Remote, or manual 3-way merge

【External File Support】
・Open or import Markdown and text files shared from other apps
・Import to your managed folder with automatic conflict resolution

【Full-Text Search】
・Real-time search across all files in your managed folder
・Searches both file names and content; results show in-context snippets

【Trash】
・Deleted files go to Trash instead of being permanently removed
・Restore instantly with "Undo" right after deletion
・Restore to original location or permanently delete from Trash

【PDF Export】
・Export any Markdown file as a multi-page PDF
・Tables and code blocks avoid mid-page breaks
・Watch a short rewarded ad to unlock each export

【AI Quick-Launch】
・One-tap access to Claude, ChatGPT, and Gemini from within the app
・Opens in a Custom Tab so you stay in context

【Customization】
・Light / Dark / System theme
・Adjustable font size (12–24 sp)
・Character encoding settings (UTF-8, UTF-16, Shift_JIS, EUC-JP, ISO-2022-JP, ISO-8859-1, Windows-1252)
・Switch display language between English and Japanese

【Notes】
・Supported formats: .md and .txt (read-only viewing for .pdf)
・Files between 5–10 MB can be opened with a warning; files over 10 MB cannot be opened
・Files are stored only in your local folder or Dropbox. No data is sent to other external servers.
・This app contains banner ads. PDF export uses a rewarded ad.