Privacy

There is nowhere for your notes to go.

This is not a policy about how carefully data is handled. It is a description of an application that has no backend, so there is no collection to describe, minimise or promise to delete.

Your markdown: Files you import are read by your browser using the standard file picker or drag and drop, parsed in the tab, and drawn. They are never transmitted. There is no upload endpoint in this application.
Your maps: Imported maps, your arrangement of them and any edits made in the Source tab are stored in this browser's localStorage under the keymd2hd.projects. They stay on the device, are not synced, and are not readable by any other site.
Accounts: There are none. md2hd does not ask for an email address, does not issue a session, and has no way to tell one visitor from another.
Analytics and cookies: The application sets no cookies and runs no analytics, product telemetry, session recording or A/B testing. Nothing on this site asks for consent because nothing on it requires any.
Third parties: The site loads two typefaces — Inter and IBM Plex Mono — from Google Fonts, which means your browser makes a request to fonts.googleapis.com andfonts.gstatic.com and those servers see your IP address. That is the only request this site makes to anyone other than its own host, and it happens on the marketing pages and the application alike.
Hosting: The site is static files. Whoever serves them will keep ordinary web server logs — IP address, user agent, requested path — for a period they control. That is true of every website and is not something md2hd collects or has access to.

Consequences

What this costs you.

Local-first is a trade, not a free win. The honest version of the bargain:

Clearing site data deletes your maps: There is no copy anywhere else. Your original markdown files are untouched — reimport the folder and you are back — but the arrangement and any Source-tab edits are gone.
Maps do not follow you between devices: A map imported on your laptop is not on your phone. Your markdown is the portable artefact; the map is a view of it.
Private browsing forgets everything: A private or incognito window discards local storage when it closes, so the app will open fresh each time.
Roughly 5 MB of headroom: That is the browser's cap on local storage per site. It is a lot of markdown, but not a whole large vault — import the folder you want to read.

Verifying any of this

The source is public, the application is a static bundle, and your browser's network panel will show you exactly what it requests. That is a better assurance than this page is.

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Last updated 10 August 2026. Material changes will appear in the changelog.