The church's core is medieval, built of rough grey stone, but its present appearance owes much to later alterations. A substantial rebuilding in 1807 added a three-sided chancel to the original structure, changing its eastern end considerably. Further changes followed through the 19th century: a sacristy was added in 1840, and the tower was raised in 1857, giving the church the silhouette visitors see today.
Inside, the most striking feature is the restrained late Gustavian decorative painting in the chancel vault, created by Johan Lundgren. It depicts a Trinity symbol and seraphim set against a sky, a simple but characterful scheme typical of the period. A restoration in 1913 introduced a new wooden ceiling together with painted decoration above the altar, adding to the layered history of the interior.
Among the furnishings, a sandstone font of the so-called lily-stone type dates back to the 1200s, making it one of the oldest surviving objects in the building. A crucifix from the 15th century and a 17th-century pulpit, whose original painted decoration was uncovered during restoration work in 1936, add further medieval and early modern texture to the church's collection.
The larger of the two bells is especially notable: cast in 1421 by an anonymous founder known only as the Hourglass Master, it carries a Latin inscription and a distinctive W-shaped founder's mark. The smaller bell, cast in 1748, has its own story—it came originally from the neighbouring Österbitterna church, which burned down in 1781. After that fire, this church, then known as Västerbitterna, took on the name Bitterna and became the shared place of worship for the whole area.
The organ, standing on the west gallery, was built in 1967 by Frede Aagaard, incorporating a case that dates back to an earlier 1900 organ, with a Rückpositiv designed by Danish architect Finn Ditlevsen.