An image forming system includes an applying unit that applies a crimping toner having pressure-responsiveness onto at least a portion of a surface of a recording medium to form a net-dot structure having 300 or more of screen lines, a heating unit that heats the crimping toner applied to the recording medium, and a pressurizing unit that pressurizes, in a thickness direction, a stacked body in which the recording medium is folded with the heated crimping toner interposed or a stacked body in which the recording medium and another medium are stacked with the heated crimping toner interposed.