diff --git a/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs b/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs
index 4756dea867..f465741367 100644
--- a/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs
+++ b/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs
@@ -5,6 +5,7 @@ using System.Buffers.Binary;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.Arm;
 using System.Runtime.Intrinsics.X86;
 
 // ReSharper disable InconsistentNaming
@@ -14,7 +15,7 @@ internal static class LossyUtils
 {
     // Note: method name in libwebp reference implementation is called VP8SSE16x16.
     [MethodImpl(InliningOptions.ShortMethod)]
-    public static int Vp8_Sse16X16(Span<byte> a, Span<byte> b)
+    public static int Vp8_Sse16x16(Span<byte> a, Span<byte> b)
     {
         if (Avx2.IsSupported)
         {
@@ -26,12 +27,17 @@ internal static class LossyUtils
             return Vp8_Sse16xN_Sse2(a, b, 8);
         }
 
+        if (AdvSimd.IsSupported)
+        {
+            return Vp8_Sse16x16_Neon(a, b);
+        }
+
         return Vp8_SseNxN(a, b, 16, 16);
     }
 
     // Note: method name in libwebp reference implementation is called VP8SSE16x8.
     [MethodImpl(InliningOptions.ShortMethod)]
-    public static int Vp8_Sse16X8(Span<byte> a, Span<byte> b)
+    public static int Vp8_Sse16x8(Span<byte> a, Span<byte> b)
     {
         if (Avx2.IsSupported)
         {
@@ -43,12 +49,17 @@ internal static class LossyUtils
             return Vp8_Sse16xN_Sse2(a, b, 4);
         }
 
+        if (AdvSimd.IsSupported)
+        {
+            return Vp8_Sse16x8_Neon(a, b);
+        }
+
         return Vp8_SseNxN(a, b, 16, 8);
     }
 
     // Note: method name in libwebp reference implementation is called VP8SSE4x4.
     [MethodImpl(InliningOptions.ShortMethod)]
-    public static int Vp8_Sse4X4(Span<byte> a, Span<byte> b)
+    public static int Vp8_Sse4x4(Span<byte> a, Span<byte> b)
     {
         if (Avx2.IsSupported)
         {
@@ -119,6 +130,11 @@ internal static class LossyUtils
             return Numerics.ReduceSum(sum);
         }
 
+        if (AdvSimd.IsSupported)
+        {
+            return Vp8_Sse4x4_Neon(a, b);
+        }
+
         return Vp8_SseNxN(a, b, 4, 4);
     }
 
@@ -201,6 +217,91 @@ internal static class LossyUtils
         return Numerics.ReduceSum(sum);
     }
 
+    [MethodImpl(InliningOptions.ShortMethod)]
+    private static int Vp8_Sse16x16_Neon(Span<byte> a, Span<byte> b)
+    {
+        Vector128<uint> sum = Vector128<uint>.Zero;
+        for (int y = 0; y < 16; y++)
+        {
+            sum = AccumulateSSE16Neon(a.Slice(y * WebpConstants.Bps), b.Slice(y * WebpConstants.Bps), sum);
+        }
+
+        return ReduceSum(sum);
+    }
+
+    [MethodImpl(InliningOptions.ShortMethod)]
+    private static int Vp8_Sse16x8_Neon(Span<byte> a, Span<byte> b)
+    {
+        Vector128<uint> sum = Vector128<uint>.Zero;
+        for (int y = 0; y < 8; y++)
+        {
+            sum = AccumulateSSE16Neon(a.Slice(y * WebpConstants.Bps), b.Slice(y * WebpConstants.Bps), sum);
+        }
+
+        return ReduceSum(sum);
+    }
+
+    [MethodImpl(InliningOptions.ShortMethod)]
+    private static int Vp8_Sse4x4_Neon(Span<byte> a, Span<byte> b)
+    {
+        Vector128<byte> a0 = Load4x4Neon(a).AsByte();
+        Vector128<byte> b0 = Load4x4Neon(b).AsByte();
+        Vector128<byte> absDiff = AdvSimd.AbsoluteDifference(a0, b0);
+        Vector64<byte> absDiffLower = absDiff.GetLower().AsByte();
+        Vector64<byte> absDiffUpper = absDiff.GetUpper().AsByte();
+        Vector128<ushort> prod1 = AdvSimd.MultiplyWideningLower(absDiffLower, absDiffLower);
+        Vector128<ushort> prod2 = AdvSimd.MultiplyWideningLower(absDiffUpper, absDiffUpper);
+
+        // pair-wise adds and widen.
+        Vector128<uint> sum1 = AdvSimd.AddPairwiseWidening(prod1);
+        Vector128<uint> sum2 = AdvSimd.AddPairwiseWidening(prod2);
+        return ReduceSum(AdvSimd.Add(sum1, sum2));
+    }
+
+    // Load all 4x4 pixels into a single Vector128<uint>
+    [MethodImpl(InliningOptions.ShortMethod)]
+    private static unsafe Vector128<uint> Load4x4Neon(Span<byte> src)
+    {
+        fixed (byte* srcRef = &MemoryMarshal.GetReference(src))
+        {
+            Vector128<uint> output = Vector128<uint>.Zero;
+            output = AdvSimd.LoadAndInsertScalar(output, 0, (uint*)srcRef);
+            output = AdvSimd.LoadAndInsertScalar(output, 1, (uint*)(srcRef + WebpConstants.Bps));
+            output = AdvSimd.LoadAndInsertScalar(output, 2, (uint*)(srcRef + (WebpConstants.Bps * 2)));
+            output = AdvSimd.LoadAndInsertScalar(output, 3, (uint*)(srcRef + (WebpConstants.Bps * 3)));
+            return output;
+        }
+    }
+
+    [MethodImpl(InliningOptions.ShortMethod)]
+    private static int ReduceSum(Vector128<uint> sum)
+    {
+        Vector128<ulong> sum2 = AdvSimd.AddPairwiseWidening(sum);
+        Vector64<uint> sum3 = AdvSimd.Add(sum2.GetLower().AsUInt32(), sum2.GetUpper().AsUInt32());
+        return (int)AdvSimd.Extract(sum3, 0);
+    }
+
+    [MethodImpl(InliningOptions.ShortMethod)]
+    private static Vector128<uint> AccumulateSSE16Neon(Span<byte> a, Span<byte> b, Vector128<uint> sum)
+    {
+        ref byte aRef = ref MemoryMarshal.GetReference(a);
+        ref byte bRef = ref MemoryMarshal.GetReference(b);
+
+        Vector128<byte> a0 = Unsafe.As<byte, Vector128<byte>>(ref aRef);
+        Vector128<byte> b0 = Unsafe.As<byte, Vector128<byte>>(ref bRef);
+
+        Vector128<byte> absDiff = AdvSimd.AbsoluteDifference(a0, b0);
+        Vector64<byte> absDiffLower = absDiff.GetLower();
+        Vector64<byte> absDiffUpper = absDiff.GetUpper();
+        Vector128<ushort> prod1 = AdvSimd.MultiplyWideningLower(absDiffLower, absDiffLower);
+        Vector128<ushort> prod2 = AdvSimd.MultiplyWideningLower(absDiffUpper, absDiffUpper);
+
+        // pair-wise adds and widen.
+        Vector128<uint> sum1 = AdvSimd.AddPairwiseWidening(prod1);
+        Vector128<uint> sum2 = AdvSimd.AddPairwiseWidening(prod2);
+        return AdvSimd.Add(sum, AdvSimd.Add(sum1, sum2));
+    }
+
     [MethodImpl(InliningOptions.ShortMethod)]
     private static Vector128<int> SubtractAndAccumulate(Vector128<byte> a, Vector128<byte> b)
     {
diff --git a/src/ImageSharp/Formats/Webp/Lossy/QuantEnc.cs b/src/ImageSharp/Formats/Webp/Lossy/QuantEnc.cs
index fed9c16d4d..fca0d03f23 100644
--- a/src/ImageSharp/Formats/Webp/Lossy/QuantEnc.cs
+++ b/src/ImageSharp/Formats/Webp/Lossy/QuantEnc.cs
@@ -53,7 +53,7 @@ internal static unsafe class QuantEnc
             rdCur.Nz = (uint)ReconstructIntra16(it, dqm, rdCur, tmpDst, mode);
 
             // Measure RD-score.
-            rdCur.D = LossyUtils.Vp8_Sse16X16(src, tmpDst);
+            rdCur.D = LossyUtils.Vp8_Sse16x16(src, tmpDst);
             rdCur.SD = tlambda != 0 ? Mult8B(tlambda, LossyUtils.Vp8Disto16X16(src, tmpDst, WeightY, scratch)) : 0;
             rdCur.H = WebpConstants.Vp8FixedCostsI16[mode];
             rdCur.R = it.GetCostLuma16(rdCur, proba, res);
@@ -145,7 +145,7 @@ internal static unsafe class QuantEnc
                 rdTmp.Nz = (uint)ReconstructIntra4(it, dqm, tmpLevels, src, tmpDst, mode);
 
                 // Compute RD-score.
-                rdTmp.D = LossyUtils.Vp8_Sse4X4(src, tmpDst);
+                rdTmp.D = LossyUtils.Vp8_Sse4x4(src, tmpDst);
                 rdTmp.SD = tlambda != 0 ? Mult8B(tlambda, LossyUtils.Vp8Disto4X4(src, tmpDst, WeightY, scratch)) : 0;
                 rdTmp.H = modeCosts[mode];
 
@@ -235,7 +235,7 @@ internal static unsafe class QuantEnc
             rdUv.Nz = (uint)ReconstructUv(it, dqm, rdUv, tmpDst, mode);
 
             // Compute RD-score
-            rdUv.D = LossyUtils.Vp8_Sse16X8(src, tmpDst);
+            rdUv.D = LossyUtils.Vp8_Sse16x8(src, tmpDst);
             rdUv.SD = 0;    // not calling TDisto here: it tends to flatten areas.
             rdUv.H = WebpConstants.Vp8FixedCostsUv[mode];
             rdUv.R = it.GetCostUv(rdUv, proba, res);
@@ -389,7 +389,7 @@ internal static unsafe class QuantEnc
             for (mode = 0; mode < WebpConstants.NumPredModes; ++mode)
             {
                 Span<byte> reference = it.YuvP.AsSpan(Vp8Encoding.Vp8I16ModeOffsets[mode]);
-                long score = (LossyUtils.Vp8_Sse16X16(src, reference) * WebpConstants.RdDistoMult) + (WebpConstants.Vp8FixedCostsI16[mode] * lambdaDi16);
+                long score = (LossyUtils.Vp8_Sse16x16(src, reference) * WebpConstants.RdDistoMult) + (WebpConstants.Vp8FixedCostsI16[mode] * lambdaDi16);
 
                 if (mode > 0 && WebpConstants.Vp8FixedCostsI16[mode] > bitLimit)
                 {
@@ -436,7 +436,7 @@ internal static unsafe class QuantEnc
                 for (mode = 0; mode < WebpConstants.NumBModes; ++mode)
                 {
                     Span<byte> reference = it.YuvP.AsSpan(Vp8Encoding.Vp8I4ModeOffsets[mode]);
-                    long score = (LossyUtils.Vp8_Sse4X4(src, reference) * WebpConstants.RdDistoMult) + (modeCosts[mode] * lambdaDi4);
+                    long score = (LossyUtils.Vp8_Sse4x4(src, reference) * WebpConstants.RdDistoMult) + (modeCosts[mode] * lambdaDi4);
                     if (score < bestI4Score)
                     {
                         bestI4Mode = mode;
@@ -485,7 +485,7 @@ internal static unsafe class QuantEnc
             for (mode = 0; mode < WebpConstants.NumPredModes; ++mode)
             {
                 Span<byte> reference = it.YuvP.AsSpan(Vp8Encoding.Vp8UvModeOffsets[mode]);
-                long score = (LossyUtils.Vp8_Sse16X8(src, reference) * WebpConstants.RdDistoMult) + (WebpConstants.Vp8FixedCostsUv[mode] * lambdaDuv);
+                long score = (LossyUtils.Vp8_Sse16x8(src, reference) * WebpConstants.RdDistoMult) + (WebpConstants.Vp8FixedCostsUv[mode] * lambdaDuv);
                 if (score < bestUvScore)
                 {
                     bestMode = mode;
diff --git a/tests/ImageSharp.Tests/Formats/WebP/LossyUtilsTests.cs b/tests/ImageSharp.Tests/Formats/WebP/LossyUtilsTests.cs
index 69b503b5e5..4682536d05 100644
--- a/tests/ImageSharp.Tests/Formats/WebP/LossyUtilsTests.cs
+++ b/tests/ImageSharp.Tests/Formats/WebP/LossyUtilsTests.cs
@@ -140,7 +140,7 @@ public class LossyUtilsTests
         int expected = 2063;
 
         // act
-        int actual = LossyUtils.Vp8_Sse16X16(a, b);
+        int actual = LossyUtils.Vp8_Sse16x16(a, b);
 
         // assert
         Assert.Equal(expected, actual);
@@ -186,7 +186,7 @@ public class LossyUtilsTests
         int expected = 749;
 
         // act
-        int actual = LossyUtils.Vp8_Sse16X8(a, b);
+        int actual = LossyUtils.Vp8_Sse16x8(a, b);
 
         // assert
         Assert.Equal(expected, actual);
@@ -218,7 +218,7 @@ public class LossyUtilsTests
         int expected = 27;
 
         // act
-        int actual = LossyUtils.Vp8_Sse4X4(a, b);
+        int actual = LossyUtils.Vp8_Sse4x4(a, b);
 
         // assert
         Assert.Equal(expected, actual);