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diff --git a/third_party/jpeg-xl/lib/extras/enc/jpegli.h b/third_party/jpeg-xl/lib/extras/enc/jpegli.h
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+++ b/third_party/jpeg-xl/lib/extras/enc/jpegli.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_ENC_JPEGLI_H_
+#define LIB_EXTRAS_ENC_JPEGLI_H_
+
+// Encodes JPG pixels and metadata in memory using the libjpegli library.
+
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "lib/extras/packed_image.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+namespace extras {
+
+struct JpegSettings {
+  bool xyb = false;
+  size_t target_size = 0;
+  float distance = 1.f;
+  bool use_adaptive_quantization = true;
+  bool use_std_quant_tables = false;
+  int progressive_level = 2;
+  bool optimize_coding = true;
+  std::string chroma_subsampling;
+  int libjpeg_quality = 0;
+  std::string libjpeg_chroma_subsampling;
+  // If not empty, must contain concatenated APP marker segments. In this case,
+  // these and only these APP marker segments will be written to the JPEG
+  // output. In xyb mode app_data must not contain an ICC profile, in this
+  // case an additional APP2 ICC profile for the XYB colorspace will be emitted.
+  std::vector<uint8_t> app_data;
+};
+
+Status EncodeJpeg(const PackedPixelFile& ppf, const JpegSettings& jpeg_settings,
+                  ThreadPool* pool, std::vector<uint8_t>* compressed);
+
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_ENC_JPEGLI_H_