In this letter, the scheme of a tapered mode-selective coupler based on photonic crystal fiber (PCF) is proposed. Three typical mode converters, such as $\mathrm{LP}_{\text {01}}$ to $\mathrm{LP}_{\text {11a}}$ , $\mathrm{LP}_{\text {01}}$ to $\mathrm{LP}_{\text {11b}}$ , and $\mathrm{LP}_{\text {01}}$ to $\mathrm{LP}_{\text {21}}$ , are described and simulated in detail. The coupling loss and bandwidth is calculated to evaluate those mode converters. The results demonstrate that those mode converters are broadband and low-loss devices. In addition, those mode converters are insensitive to the orthogonal polarizations. They can be fabricated using PCF postprocessing technique and are useful for future mode-division multiplexing optical fiber communication systems.