Make a contact tree (phone tree / call tree) for an emergency contact list, PTA or kids' group, club or team, neighborhood association, or company, just by typing names one per line and indenting a line (space or Tab) to show who is called by whom, then print it on A4 or save it as an image (PNG). A line indented one level deeper becomes a person called by the line just above it, so you can put a coordinator or leader at the top and hang each group's members under them, and the contact tree is laid out as a diagram for you. You don't need to arrange shapes in Excel or hunt for a Word template and redraw connectors — the indentation alone builds the hierarchy and the connecting lines. Add a comma or tab after a name to include a phone number, and it appears inside that person's box. Choose the direction — top-down (branching downward) or left-right (branching to the right) — and the layout automatically scales to fit on an A4 page even with many people or levels. The origin (the first person) is highlighted with an accent-colored border, you can pick a serif (Mincho) or sans (Gothic) typeface, and set the underline and root accent color. Use the same input for a small, simple contact list or a large emergency tree split into groups. These style choices are remembered next time. The output is a white-background PNG, so you can print it at A4 actual size at home or a convenience store to hand out or post, paste it as an image into Word, a spreadsheet or email, or share it as a file. The names, phone numbers and title you type are never sent to a server or stored (only the style options are kept in your browser). Everything runs locally in your browser.