Sharing & permissions

MMD Studio has three sharing modes. Pick per diagram via the Share dialog in the toolbar when you're signed in.

Private (default) account required

Only you can see the diagram. Visiting its URL from another account (or logged out) returns a 404 — the server won't even confirm the diagram exists. This is the default for every diagram you create.

Anyone with the link account required

The /d/<id> URL becomes a public read-only view. Anyone who opens it gets a rendered copy of the diagram with the owner's email shown as a small credit line in the toolbar, plus a Save a copy button if they want their own editable version.

Viewers also get the diagram added to their sidebar under a Users icon so they can find it again later. Removing it from their sidebar doesn't touch the original on the server.

Link access: Can view

The current default. Viewers see exactly the state of the diagram at the moment they open it, refreshed whenever they revisit or focus the tab. The original always remains in your control.

Link access: Can edit (coming soon)

Will let any signed-in viewer edit the same diagram in place — edits will flow back to your copy via the same sync engine that keeps your own devices in sync. Logged-out viewers stay read-only. See pricing for availability.

Invite-only (coming soon) account required

Will let you share a diagram with a specific allowlist of email addresses. Only users signed in as one of those addresses can open the link; anyone else sees a 404. Both "can view" and "can edit" access apply. See pricing.

How anon share links work

When you're signed out, clicking Share copies a long URL that contains your diagram's source embedded in the # fragment (compressed with lz-string). Anyone who opens the URL automatically gets a copy of the diagram in their own browser — no server round trip required.

Link-share URLs (/d/<id>) are only available to signed-in users because they require a stable server-side id.

Unsharing account required

Flip the visibility back to Private in the share dialog. Anyone who had the link will now see "This shared diagram doesn't exist or is private" on their next refresh. Their cached copy in the sidebar sticks around but becomes stale.