Start with a blank document or open the example from the More menu. Write Markdown, use the formatting toolbar, and switch between editing, split view and preview. On small screens, use the Edit and Preview tabs.
Open or drop a UTF-8 .md, .markdown or .txt file. Imports create a new draft after confirmation. Invalid encoding, binary content and oversized files are rejected without replacing the current document. A UTF-8 BOM and consistent original line endings are preserved in Markdown downloads. Mixed line endings are normalized to LF after confirmation.
The Export menu offers Markdown, a standalone HTML document and Print / Save as PDF. HTML includes its own reading styles and does not need this application to open. Printing opens the browser’s dialog; select a PDF destination there. The application cannot tell whether you saved or canceled that dialog.
Drafts are stored in IndexedDB in the current browser. They are saved after a short typing pause. Check the save status before leaving. The browser cannot guarantee the final keystrokes survive a forced shutdown. Clearing website data, switching browser profiles or using another device will not preserve these drafts. Download important documents and keep a backup.
Backup restores add new copies and skip exact duplicate content; existing drafts are kept. Interface preferences are restored only when explicitly selected. Storage failures keep the current source available for Markdown download. A conflicting change from another tab is not silently used to replace your unsaved text.
Raw HTML is displayed as text. Scripts and Mermaid diagrams are not executed. Links use a restricted protocol policy. External images are blocked until you allow them for the current document version. Loading them may contact third parties, and editing or switching documents invalidates that permission. An HTML export with allowed external images keeps those network dependencies; it is not an offline image package.
A document can contain up to 1 MiB of UTF-8 source including its BOM and retained line endings, and at most 20,000 lines. The browser can keep up to 50 drafts with a total of 8 MiB of source. Preview complexity has a separate limit; if it is exceeded, the source remains available for download.
Document processing and drafts stay in the browser. No account is required. Optional Google Analytics loads only after consent in the editor’s Privacy & help dialog; files, text and filenames are excluded. Consent can be withdrawn there. Explicitly allowed external image requests are the exception to local processing. There is no document synchronization, cloud sharing or server-side conversion.