Your canvas is local by default.
MapMedium is designed so that diagram content can remain in your browser. This page explains where documents live, what can remove them, and how to keep durable backups.
What MapMedium stores
The application stores documents, document metadata, preferences, and recovery information in the browser’s site storage, primarily IndexedDB. If IndexedDB is unavailable, a limited localStorage fallback may be used.
- Documents are associated with this browser profile and the exact MapMedium web origin.
- No MapMedium account or cross-device sync is included.
- The service worker caches application files so the editor can reopen offline after a successful online load.
What can delete local documents
Use Export → MapMedium file for individual editable files and Download all backups on the home page for a browser-wide backup. Keep important files in a folder or backup system you control.
Network behaviour and advertising
The editor includes the shared PicPlayer advertising SDK. On sufficiently wide screens, it contacts ads.picplayer.com using the public application ID mapmedium. Advertisements render in sandboxed frames on the separate frames.picplayer.com origin. The rail is hidden below a 1280-pixel viewport width.
The SDK sends app and placement identifiers, consent fields when supplied, and advertisement delivery/event tokens. It does not send diagram content, imported images, document titles or canvas pixels to the ad manager. Its requests omit credentials and referrers, and the supplied SDK does not create persistent user identifiers. The hosting and advertising services still receive ordinary connection information, such as IP addresses and request times.
The default is contextual advertising with no personalized or third-party network permission granted. Provider inventory that requires consent must be connected by the site owner to an appropriate consent platform. This SDK is not itself a consent-management platform. The Ad choices button opens this page unless the owner connects it to their real preference interface. An unavailable manager leaves a local fallback and does not block editing.
The application has no analytics library, remote fonts or account backend. Network-menu links open other applications only when activated. Imported images are embedded as data inside the document when possible. The service worker caches local application assets, not cross-origin ad API responses or creatives.
Permissions
MapMedium may ask the browser to grant persistent storage. The browser decides whether to grant it. Installation as a PWA and clipboard image access are also browser-controlled and may require a user action.
Before deploying your own copy
The site owner should update this page with their legal identity, contact details, host/CDN logging policy, jurisdiction-specific notices, and any optional services they add. Adding analytics, cloud storage, collaboration, authentication, or AI APIs changes the privacy model described here.