diff --git a/core/metrics/insights.go b/core/metrics/insights.go
index d48e7d67..df3ca9a4 100644
--- a/core/metrics/insights.go
+++ b/core/metrics/insights.go
@@ -265,6 +265,10 @@ func (c *insightsCollector) collect(ctx context.Context) []byte {
 	if err != nil {
 		log.Trace(ctx, "Error reading active users count", err)
 	}
+	data.Library.FileSuffixes, err = c.ds.MediaFile(ctx).CountBySuffix()
+	if err != nil {
+		log.Trace(ctx, "Error reading file suffixes count", err)
+	}
 
 	// Check for smart playlists
 	data.Config.HasSmartPlaylists, err = c.hasSmartPlaylists(ctx)
diff --git a/core/metrics/insights/data.go b/core/metrics/insights/data.go
index c46eb874..19007fd0 100644
--- a/core/metrics/insights/data.go
+++ b/core/metrics/insights/data.go
@@ -40,6 +40,7 @@ type Data struct {
 		Libraries     int64            `json:"libraries"`
 		ActiveUsers   int64            `json:"activeUsers"`
 		ActivePlayers map[string]int64 `json:"activePlayers,omitempty"`
+		FileSuffixes  map[string]int64 `json:"fileSuffixes,omitempty"`
 	} `json:"library"`
 	Config struct {
 		LogLevel                string `json:"logLevel,omitempty"`
diff --git a/model/mediafile.go b/model/mediafile.go
index 0ef26d74..1ae63e75 100644
--- a/model/mediafile.go
+++ b/model/mediafile.go
@@ -353,6 +353,7 @@ type MediaFileCursor iter.Seq2[MediaFile, error]
 
 type MediaFileRepository interface {
 	CountAll(options ...QueryOptions) (int64, error)
+	CountBySuffix(options ...QueryOptions) (map[string]int64, error)
 	Exists(id string) (bool, error)
 	Put(m *MediaFile) error
 	Get(id string) (*MediaFile, error)
diff --git a/persistence/mediafile_repository.go b/persistence/mediafile_repository.go
index f18e6d24..7f65540c 100644
--- a/persistence/mediafile_repository.go
+++ b/persistence/mediafile_repository.go
@@ -124,6 +124,25 @@ func (r *mediaFileRepository) CountAll(options ...model.QueryOptions) (int64, er
 	return r.count(query, options...)
 }
 
+func (r *mediaFileRepository) CountBySuffix(options ...model.QueryOptions) (map[string]int64, error) {
+	sel := r.newSelect(options...).
+		Columns("lower(suffix) as suffix", "count(*) as count").
+		GroupBy("lower(suffix)")
+	var res []struct {
+		Suffix string
+		Count  int64
+	}
+	err := r.queryAll(sel, &res)
+	if err != nil {
+		return nil, err
+	}
+	counts := make(map[string]int64, len(res))
+	for _, c := range res {
+		counts[c.Suffix] = c.Count
+	}
+	return counts, nil
+}
+
 func (r *mediaFileRepository) Exists(id string) (bool, error) {
 	return r.exists(Eq{"media_file.id": id})
 }
diff --git a/persistence/mediafile_repository_test.go b/persistence/mediafile_repository_test.go
index ab926c00..35fda087 100644
--- a/persistence/mediafile_repository_test.go
+++ b/persistence/mediafile_repository_test.go
@@ -41,6 +41,44 @@ var _ = Describe("MediaRepository", func() {
 		Expect(mr.CountAll()).To(Equal(int64(10)))
 	})
 
+	Describe("CountBySuffix", func() {
+		var mp3File, flacFile1, flacFile2, flacUpperFile model.MediaFile
+
+		BeforeEach(func() {
+			mp3File = model.MediaFile{ID: "suffix-mp3", LibraryID: 1, Suffix: "mp3", Path: "/test/file.mp3"}
+			flacFile1 = model.MediaFile{ID: "suffix-flac1", LibraryID: 1, Suffix: "flac", Path: "/test/file1.flac"}
+			flacFile2 = model.MediaFile{ID: "suffix-flac2", LibraryID: 1, Suffix: "flac", Path: "/test/file2.flac"}
+			flacUpperFile = model.MediaFile{ID: "suffix-FLAC", LibraryID: 1, Suffix: "FLAC", Path: "/test/file.FLAC"}
+
+			Expect(mr.Put(&mp3File)).To(Succeed())
+			Expect(mr.Put(&flacFile1)).To(Succeed())
+			Expect(mr.Put(&flacFile2)).To(Succeed())
+			Expect(mr.Put(&flacUpperFile)).To(Succeed())
+		})
+
+		AfterEach(func() {
+			_ = mr.Delete(mp3File.ID)
+			_ = mr.Delete(flacFile1.ID)
+			_ = mr.Delete(flacFile2.ID)
+			_ = mr.Delete(flacUpperFile.ID)
+		})
+
+		It("counts media files grouped by suffix with lowercase normalization", func() {
+			counts, err := mr.CountBySuffix()
+			Expect(err).ToNot(HaveOccurred())
+
+			// Should have lowercase keys only
+			Expect(counts).To(HaveKey("mp3"))
+			Expect(counts).To(HaveKey("flac"))
+			Expect(counts).ToNot(HaveKey("FLAC"))
+
+			// mp3: 1 file
+			Expect(counts["mp3"]).To(Equal(int64(1)))
+			// flac: 3 files (2 lowercase + 1 uppercase normalized)
+			Expect(counts["flac"]).To(Equal(int64(3)))
+		})
+	})
+
 	It("returns songs ordered by lyrics with a specific title/artist", func() {
 		// attempt to mimic filters.SongsByArtistTitleWithLyricsFirst, except we want all items
 		results, err := mr.GetAll(model.QueryOptions{