PrettyMD

Read local Markdown and text files with tables, highlighted code, math, diagrams and zoomable images, offline.

PrettyMD turns local Markdown and plain-text files into clean, readable pages in Chrome. Open a file in Chrome (right-click → Open With → Google Chrome, drag it into a tab, or press Ctrl/Cmd+O). Markdown files (.md, .markdown) render automatically. Text files (.txt, .log) open as clean plain text, and you can switch any of them to View as Markdown. Markdown files: • GitHub-style formatting with tables and highlighted code • LaTeX math (KaTeX) and Mermaid diagrams • Table of contents, light/dark themes and a raw view • Export to PDF through Chrome's print dialog • Edit with a live preview. The first save suggests a copy name; later saves normally reuse the file you chose Images: • Enlarge images in a document to inspect them: fit to window, 100%, manual zoom from 10% to 800%, and pan • See pixel dimensions for raster images, or "SVG (scalable)" for recognised SVGs, and show a checkerboard to reveal transparency • Keyboard accessible; works in Markdown files and in text files viewed as Markdown Plain-text files (.txt, .log): • Open as plain text, preserving the spacing and line breaks Chrome supplies • Wrap lines on or off • View as Markdown in the current tab when a text file contains Markdown • Edit and save, keeping the file's own extension Private by design: documents are processed locally, nothing is uploaded, and there are no analytics or ads. Everything is bundled, so it works offline. Online images referenced in a document are loaded from their websites. Setup: after installing, open chrome://extensions → PrettyMD → Details and turn on "Allow access to file URLs". The welcome page walks you through it.