diff --git a/internal/search/photos_filter_alt_test.go b/internal/search/photos_filter_alt_test.go
new file mode 100644
index 000000000..87edb7347
--- /dev/null
+++ b/internal/search/photos_filter_alt_test.go
@@ -0,0 +1,180 @@
+package search
+
+import (
+	"testing"
+
+	"github.com/photoprism/photoprism/internal/form"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPhotosFilterAlt(t *testing.T) {
+	t.Run("-10", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Alt = "-10"
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, r := range photos {
+			assert.GreaterOrEqual(t, -10, r.PhotoAltitude)
+			assert.LessOrEqual(t, -10, r.PhotoAltitude)
+		}
+		assert.Equal(t, len(photos), 1)
+	})
+	t.Run("-100--5", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Alt = "-100--5"
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, r := range photos {
+			assert.GreaterOrEqual(t, -5, r.PhotoAltitude)
+			assert.LessOrEqual(t, -100, r.PhotoAltitude)
+		}
+
+		assert.Equal(t, len(photos), 2)
+	})
+	t.Run("200-500", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Alt = "200-500"
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, r := range photos {
+			assert.GreaterOrEqual(t, 500, r.PhotoAltitude)
+			assert.LessOrEqual(t, 200, r.PhotoAltitude)
+		}
+
+		assert.Equal(t, len(photos), 2)
+	})
+	t.Run("200", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Alt = "200"
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		assert.Equal(t, len(photos), 1)
+	})
+	t.Run("invalid", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Alt = "%gold"
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		assert.GreaterOrEqual(t, len(photos), 40)
+	})
+}
+
+func TestPhotosQueryAlt(t *testing.T) {
+	t.Run("-10", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Query = "alt:\"-10\""
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, r := range photos {
+			assert.GreaterOrEqual(t, -10, r.PhotoAltitude)
+			assert.LessOrEqual(t, -10, r.PhotoAltitude)
+		}
+
+		assert.Equal(t, len(photos), 1)
+	})
+	t.Run("-100--5", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Query = "alt:\"-100--5\""
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, r := range photos {
+			assert.GreaterOrEqual(t, -5, r.PhotoAltitude)
+			assert.LessOrEqual(t, -100, r.PhotoAltitude)
+		}
+
+		assert.Equal(t, len(photos), 2)
+	})
+	t.Run("200-500", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Query = "alt:\"200-500\""
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, r := range photos {
+			assert.GreaterOrEqual(t, 500, r.PhotoAltitude)
+			assert.LessOrEqual(t, 200, r.PhotoAltitude)
+		}
+
+		assert.Equal(t, len(photos), 2)
+	})
+	t.Run("200", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Query = "alt:\"200\""
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		assert.Equal(t, len(photos), 1)
+	})
+	t.Run("invalid", func(t *testing.T) {
+		var f form.SearchPhotos
+
+		f.Query = "alt:\"%gold\""
+		f.Merged = true
+
+		photos, _, err := Photos(f)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		assert.GreaterOrEqual(t, len(photos), 40)
+	})
+}