SharpMD: Markdown reader & editor

Read and edit Markdown in the browser: outline, folder tree, search, diagrams, math and in-place editing.

SharpMD opens Markdown files in the browser and lets you edit them on the formatted text. Set Chrome as the default app for .md files and a double-click opens them with an outline, the folder they live in and search. Click the extension icon to start a new note or to open a file or a whole folder. READ • Outline built from the headings, with reading progress • Folder tree with the files next to the document • Search in the document, or in every file of the folder at once • Math with KaTeX, diagrams with Mermaid and Graphviz, tables, footnotes, task lists, callouts, YAML front matter • [[name]] links between files • Light and dark themes EDIT • Click a paragraph, a heading, a list item or a table cell and type • Type **bold** or `code` and the marks turn into formatting • Start a line with #, - or > to get a heading, a list or a quote • Right-click a block to insert, turn into, move, duplicate or delete • Diagram editor with live preview and nine templates • Find and replace, undo and redo for block operations • Type : to pick an emoji from a list • Focus mode and typewriter mode • Save with Ctrl+S, or turn on auto-save FILES • Create, rename and delete files from the tree • Paste an image and it is saved next to the document • Code and config files open highlighted, CSV opens as a table • Export to a single HTML file, or to PDF through print CLOUD AND AI (OPTIONAL) • Sign in with a code sent to your email and send a note to the cloud with one click • Cloud notes open on any device, and without a connection once you have opened them • Share a note or a folder with another account, or make a read-only public link • Connect Claude or any MCP client so your AI can read and write your cloud notes • Free up to 10 cloud notes. The paid plan (USD 3.99 a month or USD 39 a year) has no limit and adds sharing, the MCP connection, version history and the appearance options PRIVATE BY DESIGN Files are read in your browser and never uploaded. No analytics. Cloud notes are optional: a note reaches the server only when you send it there. Free and open source (MIT): https://github.com/MR-Axel/sharpmd After installing, open the extension details and turn on "Allow access to file URLs" so it can open local files.