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diff --git a/third_party/jpeg-xl/lib/extras/codec.h b/third_party/jpeg-xl/lib/extras/codec.h
new file mode 100644
index 0000000000..b7bc2a397e
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+++ b/third_party/jpeg-xl/lib/extras/codec.h
@@ -0,0 +1,54 @@
+// 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_CODEC_H_
+#define LIB_EXTRAS_CODEC_H_
+
+// Facade for image encoders/decoders (PNG, PNM, ...).
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <string>
+
+#include "lib/extras/dec/color_hints.h"
+#include "lib/extras/dec/decode.h"
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/span.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/codec_in_out.h"
+#include "lib/jxl/color_encoding_internal.h"
+#include "lib/jxl/field_encodings.h"  // MakeBit
+
+namespace jxl {
+
+struct SizeConstraints;
+
+// Decodes "bytes" and sets io->metadata.m.
+// color_space_hint may specify the color space, otherwise, defaults to sRGB.
+Status SetFromBytes(Span<const uint8_t> bytes,
+                    const extras::ColorHints& color_hints, CodecInOut* io,
+                    ThreadPool* pool = nullptr,
+                    const SizeConstraints* constraints = nullptr,
+                    extras::Codec* orig_codec = nullptr);
+// Helper function to use no color_space_hint.
+JXL_INLINE Status SetFromBytes(const Span<const uint8_t> bytes, CodecInOut* io,
+                               ThreadPool* pool = nullptr,
+                               const SizeConstraints* constraints = nullptr,
+                               extras::Codec* orig_codec = nullptr) {
+  return SetFromBytes(bytes, extras::ColorHints(), io, pool, constraints,
+                      orig_codec);
+}
+
+Status Encode(const extras::PackedPixelFile& ppf, const extras::Codec codec,
+              std::vector<uint8_t>* bytes, ThreadPool* pool);
+
+Status Encode(const extras::PackedPixelFile& ppf, const std::string& pathname,
+              std::vector<uint8_t>* bytes, ThreadPool* pool = nullptr);
+
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_CODEC_H_