Kurixalus idiootocus is a small tree frog measuring 24 to 43 millimetres (0.94 to 1.69 in) in length with the females usually being larger than the males.

It is typically found near still sheets of water, in paddy fields, damp grassland or shrubby areas.

Male frogs aggregate in suitable locations and call from the ground or low shrubs and are aggressive with one another.

The advertisement call consists of a series of bird-like trills lasting several seconds, repeated periodically.

Hatching does not take place until heavy rainfall occurs and the depression fills up or the tadpoles get washed into the nearby ditch, pond or temporary pool.