diff --git a/oviewer/convert_align.go b/oviewer/convert_align.go
index 8e90267..d0dc0f6 100644
--- a/oviewer/convert_align.go
+++ b/oviewer/convert_align.go
@@ -73,13 +73,20 @@ func (a *align) convertDelm(st *parseState) bool {
 	lc := make(contents, 0, len(st.lc))
 	for c := 0; c < len(indexes); c++ {
 		e := pos.x(indexes[c][0])
-		lc = append(lc, st.lc[s:e]...)
 		width := e - s
+		if width <= 0 {
+			break
+		}
+		lc = append(lc, st.lc[s:e]...)
+		s = e
+
+		if c >= len(a.maxWidths) {
+			continue
+		}
 		// Add space to align columns.
 		for ; width < a.maxWidths[c]+1; width++ {
 			lc = append(lc, SpaceContent)
 		}
-		s = e
 	}
 	lc = append(lc, st.lc[s:]...)
 	st.lc = lc
@@ -91,19 +98,23 @@ func (a *align) convertDelm(st *parseState) bool {
 func (a *align) convertWidth(st *parseState) bool {
 	s := 0
 	lc := make(contents, 0, len(st.lc))
-	for i := 0; i < len(a.orgWidths); i++ {
-		e := findColumnEnd(st.lc, a.orgWidths, i) + 1
+	for c := 0; c < len(a.orgWidths); c++ {
+		e := findColumnEnd(st.lc, a.orgWidths, c) + 1
 		e = min(e, len(st.lc))
 		width := e - s
-		if s >= e {
+		if width <= 0 {
 			break
 		}
 		lc = append(lc, st.lc[s:e]...)
+		s = e
+
+		if c >= len(a.maxWidths) {
+			continue
+		}
 		// Add space to align columns.
-		for ; width <= a.maxWidths[i]; width++ {
+		for ; width <= a.maxWidths[c]; width++ {
 			lc = append(lc, SpaceContent)
 		}
-		s = e
 	}
 	lc = append(lc, st.lc[s:]...)
 	st.lc = lc
diff --git a/oviewer/convert_align_test.go b/oviewer/convert_align_test.go
index 4dbb086..d804061 100644
--- a/oviewer/convert_align_test.go
+++ b/oviewer/convert_align_test.go
@@ -115,7 +115,6 @@ func Test_align_convert(t *testing.T) {
 			want:    false,
 			wantStr: "a,b,",
 		},
-
 		{
 			name: "convertAlignWidth",
 			fields: fields{
@@ -156,3 +155,125 @@ func Test_align_convert(t *testing.T) {
 		})
 	}
 }
+
+func Test_align_convertDelm(t *testing.T) {
+	type fields struct {
+		es           *escapeSequence
+		maxWidths    []int
+		orgWidths    []int
+		WidthF       bool
+		delimiter    string
+		delimiterReg *regexp.Regexp
+		count        int
+	}
+	type args struct {
+		st *parseState
+	}
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		want    bool
+		wantStr string
+	}{
+		{
+			name: "convertAlignDelm",
+			fields: fields{
+				es:        newESConverter(),
+				maxWidths: []int{1, 2},
+				WidthF:    false,
+				delimiter: ",",
+				count:     0,
+			},
+			args: args{
+				st: &parseState{
+					lc:    StrToContents("a,b,c,d,e,f", 8),
+					mainc: '\n',
+				},
+			},
+			want:    false,
+			wantStr: "a ,b ,c,d,e,f",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			a := &align{
+				es:           tt.fields.es,
+				maxWidths:    tt.fields.maxWidths,
+				orgWidths:    tt.fields.orgWidths,
+				WidthF:       tt.fields.WidthF,
+				delimiter:    tt.fields.delimiter,
+				delimiterReg: tt.fields.delimiterReg,
+				count:        tt.fields.count,
+			}
+			if got := a.convertDelm(tt.args.st); got != tt.want {
+				t.Errorf("align.convertDelm() = %v, want %v", got, tt.want)
+			}
+			goStr, _ := ContentsToStr(tt.args.st.lc)
+			if goStr != tt.wantStr {
+				t.Errorf("align.convertDelm() = %v, want %v", goStr, tt.wantStr)
+			}
+		})
+	}
+}
+
+func Test_align_convertWidth(t *testing.T) {
+	type fields struct {
+		es           *escapeSequence
+		maxWidths    []int
+		orgWidths    []int
+		WidthF       bool
+		delimiter    string
+		delimiterReg *regexp.Regexp
+		count        int
+	}
+	type args struct {
+		st *parseState
+	}
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		want    bool
+		wantStr string
+	}{
+		{
+			name: "convertAlignWidth",
+			fields: fields{
+				es:        newESConverter(),
+				maxWidths: []int{3, 3},
+				orgWidths: []int{2, 5, 8, 11, 14, 17},
+				WidthF:    true,
+				count:     0,
+			},
+			args: args{
+				st: &parseState{
+					lc:    StrToContents("a  b  c  d  e  f", 8),
+					mainc: '\n',
+				},
+			},
+			want:    false,
+			wantStr: "a   b   c  d  e  f",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			a := &align{
+				es:           tt.fields.es,
+				maxWidths:    tt.fields.maxWidths,
+				orgWidths:    tt.fields.orgWidths,
+				WidthF:       tt.fields.WidthF,
+				delimiter:    tt.fields.delimiter,
+				delimiterReg: tt.fields.delimiterReg,
+				count:        tt.fields.count,
+			}
+			if got := a.convertWidth(tt.args.st); got != tt.want {
+				t.Errorf("align.convertWidth() = %v, want %v", got, tt.want)
+			}
+			goStr, _ := ContentsToStr(tt.args.st.lc)
+			if goStr != tt.wantStr {
+				t.Errorf("align.convertWidth() = %v, want %v", goStr, tt.wantStr)
+			}
+		})
+	}
+}