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diff --git a/lib/jpegli/downsample.h b/lib/jpegli/downsample.h
new file mode 100644
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--- /dev/null
+++ b/lib/jpegli/downsample.h
@@ -0,0 +1,21 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JPEGLI_DOWNSAMPLE_H_
+#define LIB_JPEGLI_DOWNSAMPLE_H_
+
+#include "lib/jpegli/common.h"
+
+namespace jpegli {
+
+void ChooseDownsampleMethods(j_compress_ptr cinfo);
+
+void DownsampleInputBuffer(j_compress_ptr cinfo);
+
+void ApplyInputSmoothing(j_compress_ptr cinfo);
+
+}  // namespace jpegli
+
+#endif  // LIB_JPEGLI_DOWNSAMPLE_H_