We have prepared and investigated superconducting ${\mathrm{Nb}}_{67}{\mathrm{Hf}}_{11}{\mathrm{Ti}}_{11}{\mathrm{Zr}}_{11}$ and ${\mathrm{Nb}}_{35}{\mathrm{Ta}}_{35}{\mathrm{Hf}}_{10}{\mathrm{Ti}}_{10}{\mathrm{Zr}}_{10}$ medium- and high-entropy alloys in form of thin films with thicknesses of 600, 100, and 30 nm, and compared their properties with bulk counterparts. We show that the superconducting transition temperature $T_c$ as well as the upper critical magnetic field $B_{c2}\left(0\right)$ decrease with decreasing thickness. Application of hydrostatic pressure up to 33 kbar on the 600-nm ${\mathrm{Nb}}_{35}{\mathrm{Ta}}_{35}{\mathrm{Hf}}_{10}{\mathrm{Ti}}_{10}{\mathrm{Zr}}_{10}$ film shows a decrease of $T_c$ with pressure, which differs from that observed on bulk sample. However, no clear $T_c$ dependence was observed if pressure was applied on the 100-nm film. This result is most likely related to increasing disorder (tendency to structure amorphization) in thinner films. Moreover, we performed point-contact spectroscopy measurements on the 600-nm ${\mathrm{Nb}}_{67}{\mathrm{Hf}}_{11}{\mathrm{Ti}}_{11}{\mathrm{Zr}}_{11}$ and ${\mathrm{Nb}}_{35}{\mathrm{Ta}}_{35}{\mathrm{Hf}}_{10}{\mathrm{Ti}}_{10}{\mathrm{Zr}}_{10}$ films and were able to observe directly the temperature development of the superconducting energy gap $\mathrm{\Delta }\left(T\right)$ and determine the superconducting coupling strength $2\mathrm{\Delta }/k_B{T}_c=3.54$ and $2\mathrm{\Delta }/k_B{T}_c=4.21$, respectively, which is consistent with that of conventional $s$-wave phonon-mediated Bardeen-Cooper-Schrieffer superconductors.