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diff --git a/third_party/jpeg-xl/lib/extras/packed_image_convert.h b/third_party/jpeg-xl/lib/extras/packed_image_convert.h
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+++ b/third_party/jpeg-xl/lib/extras/packed_image_convert.h
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+// 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_EXTRAS_PACKED_IMAGE_CONVERT_H_
+#define LIB_EXTRAS_PACKED_IMAGE_CONVERT_H_
+
+// Helper functions to convert from the external image types to the internal
+// CodecInOut to help transitioning to the external types.
+
+#include <jxl/types.h>
+
+#include "lib/extras/packed_image.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/codec_in_out.h"
+
+namespace jxl {
+namespace extras {
+
+// Converts an external PackedPixelFile to the internal CodecInOut for use with
+// internal functions directly.
+Status ConvertPackedPixelFileToCodecInOut(const PackedPixelFile& ppf,
+                                          ThreadPool* pool, CodecInOut* io);
+
+// Converts an internal CodecInOut for use with internal function to an external
+// PackedPixelFile.
+Status ConvertCodecInOutToPackedPixelFile(const CodecInOut& io,
+                                          const JxlPixelFormat& pixel_format,
+                                          const ColorEncoding& c_desired,
+                                          ThreadPool* pool,
+                                          PackedPixelFile* ppf);
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_PACKED_IMAGE_CONVERT_H_