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{{counter[:<start>]}} — An up-counting number: 1, 2, 3, ... when printing several labels at once. Optionally starts at instead of 1.{{datetime[:<format>]}} — The date and time of printing as YYYY-MM-DD HH:MM:SS, or formatted with strftime options, e.g. %d.%m.%Y %H:%M.{{date}} / {{time}} — The date of printing as YYYY-MM-DD, or the time as HH:MM (24-hour).{{uuid}} / {{short-uuid}} — A random UUID, or its first 8 characters.{{line}} — A line from a list: the first line on the first label, the second on the second, and so on. The list appears under the preview once the label uses it.{{random[:<len>]}} — A random string of characters (default 64).{{env:<var>}} is only available on the form-based pages.