How can we help?

Drag any .md file into a tab, or press Ctrl/Cmd+O. For file:// links to work, enable Allow access to file URLs for the extension in your browser's extension settings, a one-time toggle.

Chrome, Edge, Brave, Opera and Vivaldi: any Chromium-based browser that can install Chromium extensions. Other product surfaces will only be announced after they are ready.

No. Install and read; there is nothing to sign into, and nothing is synced to a server. Annotations and bookmarks live in your browser's local storage.

GitHub, GitLab and similar sites already render Markdown on their file pages, so the extension stays out of the way there. It activates on raw files: hit the Raw button, or open any .md served as plain text.

Yes: raw.githubusercontent.com and the raw endpoints of GitLab, Bitbucket and Gitea all render, along with any .md or .mdx URL served as text.

It activates on supported raw .md and .mdx documents and stays out of the way on ordinary web pages. For local files, enable “Allow access to file URLs” once in the extension details page.

Yes. Core document processing, annotations and workspace data stay on your device, and the developer receives no document or account information through a Markdown Viewer backend. The extension contains no analytics. This public support website separately uses region-aware analytics with consent or opt-out controls. The extension provides three optional network features, and documents can also load external resources they explicitly reference; see the Privacy Policy for the full detail.

Markdown Viewer provides three optional network features: PlantUML rendering and link previews are off by default and require consent; remote document auto-refresh re-fetches only the document already open in the tab when you enable refresh. Local-file refresh only re-reads the file on your device. Separately, a document can load external resources it explicitly references, such as remote images or CSS URLs; those requests go to the named hosts under your browser's normal privacy and cookie settings.

Reading, rendering, folders, bookmarks, outline, annotations, reading position, basic document and folder search, diagrams, math, Vega-Lite, mind maps, presentation, and basic HTML, Word and print/PDF export stay free. Professional themes and skins, advanced search, professional output styling, Vega styling, Professional Word and PNG long-image export are Pro features. They are currently unlocked during the promotional period; a license will be required to keep using them after the promotion ends.

For local files, check that Allow access to file URLs is enabled, then reload the tab. For web files, confirm the URL serves the raw file rather than a site's own viewer.

Mermaid and Graphviz run offline with no setup. If a diagram fails, its source usually has a syntax error: the inline error box shows the parser message next to your source. PlantUML is optional and must be enabled first.