diff --git a/src/D3D12MemAlloc.cpp b/src/D3D12MemAlloc.cpp
index d145c5c..2555ef6 100644
--- a/src/D3D12MemAlloc.cpp
+++ b/src/D3D12MemAlloc.cpp
@@ -27,6 +27,7 @@
 #include <algorithm>
 #include <utility>
 #include <cstdlib>
+#include <cstdint>
 #include <malloc.h> // for _aligned_malloc, _aligned_free
 #ifndef _WIN32
     #include <shared_mutex>
@@ -377,7 +378,15 @@
 static T RoundDiv(T x, T y) { return (x + (y / (T)2)) / y; }
 template <typename T>
 static T DivideRoundingUp(T x, T y) { return (x + y - 1) / y; }
-    
+
+static WCHAR HexDigitToChar(UINT8 digit)
+{
+    if(digit < 10)
+        return L'0' + digit;
+    else
+        return L'A' + (digit - 10);
+}
+
 /*
 Performs binary search and returns iterator to first element that is greater or
 equal to `key`, according to comparison `cmp`.
@@ -1180,6 +1189,7 @@
     void AddNewLine() { Add(L'\n'); }
     void AddNumber(UINT num);
     void AddNumber(UINT64 num);
+    void AddPointer(const void* ptr);
 
 private:
     Vector<WCHAR> m_Data;
@@ -1224,6 +1234,22 @@
     while (num);
     Add(p);
 }
+
+void StringBuilder::AddPointer(const void* ptr)
+{
+    WCHAR buf[21];
+    uintptr_t num = (uintptr_t)ptr;
+    buf[20] = L'\0';
+    WCHAR *p = &buf[20];
+    do
+    {
+        *--p = HexDigitToChar((UINT8)(num & 0xF));
+        num >>= 4;
+    }
+    while (num);
+    Add(p);
+}
+
 #endif // _D3D12MA_STRING_BUILDER_FUNCTIONS
 #endif // _D3D12MA_STRING_BUILDER
 
@@ -1267,6 +1293,7 @@
     // Posts next part of an open string. The number is converted to decimal characters.
     void ContinueString(UINT num);
     void ContinueString(UINT64 num);
+    void ContinueString_Pointer(const void* ptr);
     // Posts next part of an open string. Pointer value is converted to characters
     // using "%p" formatting - shown as hexadecimal number, e.g.: 000000081276Ad00
     // void ContinueString_Pointer(const void* ptr);
@@ -1452,6 +1479,12 @@
     m_SB.AddNumber(num);
 }
 
+void JsonWriter::ContinueString_Pointer(const void* ptr)
+{
+    D3D12MA_ASSERT(m_InsideString);
+    m_SB.AddPointer(ptr);
+}
+
 void JsonWriter::EndString(LPCWSTR pStr)
 {
     D3D12MA_ASSERT(m_InsideString);
@@ -1524,7 +1557,9 @@
     if (privateData)
     {
         WriteString(L"CustomData");
-        WriteNumber((uintptr_t)privateData);
+        BeginString();
+        ContinueString_Pointer(privateData);
+        EndString();
     }
 
     LPCWSTR name = alloc.GetName();
@@ -7196,9 +7231,6 @@
                             json.WriteString(L"DEFAULT");
                             json.BeginObject();
                             {
-                                json.WriteString(L"Flags");
-                                json.BeginArray(true);
-                                json.EndArray();
                                 json.WriteString(L"Stats");
                                 json.AddDetailedStatisticsInfoObject(stats.HeapType[0]);
                             }
@@ -7207,9 +7239,6 @@
                         json.WriteString(L"UPLOAD");
                         json.BeginObject();
                         {
-                            json.WriteString(L"Flags");
-                            json.BeginArray(true);
-                            json.EndArray();
                             json.WriteString(L"Stats");
                             json.AddDetailedStatisticsInfoObject(stats.HeapType[1]);
                         }
@@ -7218,9 +7247,6 @@
                         json.WriteString(L"READBACK");
                         json.BeginObject();
                         {
-                            json.WriteString(L"Flags");
-                            json.BeginArray(true);
-                            json.EndArray();
                             json.WriteString(L"Stats");
                             json.AddDetailedStatisticsInfoObject(stats.HeapType[2]);
                         }
@@ -7229,9 +7255,6 @@
                         json.WriteString(L"CUSTOM");
                         json.BeginObject();
                         {
-                            json.WriteString(L"Flags");
-                            json.BeginArray(true);
-                            json.EndArray();
                             json.WriteString(L"Stats");
                             json.AddDetailedStatisticsInfoObject(customHeaps[!IsUMA()]);
                         }
@@ -7245,13 +7268,6 @@
                     json.WriteString(L"L1");
                     json.BeginObject();
                     {
-                        json.WriteString(L"Flags");
-                        json.BeginArray(true);
-                        json.EndArray();
-
-                        json.WriteString(L"Size");
-                        json.WriteNumber(0U);
-
                         json.WriteString(L"Budget");
                         WriteBudgetToJson(json, localBudget);
 
@@ -7264,9 +7280,6 @@
                             json.WriteString(L"DEFAULT");
                             json.BeginObject();
                             {
-                                json.WriteString(L"Flags");
-                                json.BeginArray(true);
-                                json.EndArray();
                                 json.WriteString(L"Stats");
                                 json.AddDetailedStatisticsInfoObject(stats.HeapType[0]);
                             }
@@ -7275,9 +7288,6 @@
                             json.WriteString(L"CUSTOM");
                             json.BeginObject();
                             {
-                                json.WriteString(L"Flags");
-                                json.BeginArray(true);
-                                json.EndArray();
                                 json.WriteString(L"Stats");
                                 json.AddDetailedStatisticsInfoObject(customHeaps[0]);
                             }
diff --git a/src/Tests.cpp b/src/Tests.cpp
index 31804bb..1f77b87 100644
--- a/src/Tests.cpp
+++ b/src/Tests.cpp
@@ -322,10 +322,10 @@
     }
 }
 
-static void SaveStatsStringToFile(const TestContext& ctx, const wchar_t* dstFilePath)
+static void SaveStatsStringToFile(const TestContext& ctx, const wchar_t* dstFilePath, BOOL detailed = TRUE)
 {
     WCHAR* s = nullptr;
-    ctx.allocator->BuildStatsString(&s, TRUE);
+    ctx.allocator->BuildStatsString(&s, detailed);
     SaveFile(dstFilePath, s, wcslen(s) * sizeof(WCHAR));
     ctx.allocator->FreeStatsString(s);
 }
diff --git a/tools/GpuMemDumpVis/GpuMemDump.schema.json b/tools/GpuMemDumpVis/GpuMemDump.schema.json
new file mode 100644
index 0000000..4d3331c
--- /dev/null
+++ b/tools/GpuMemDumpVis/GpuMemDump.schema.json
@@ -0,0 +1,163 @@
+{
+    "$id": "https://gpuopen.com/vulkan-memory-allocator/schemas/GpuMemDump",
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "type": "object",
+    "properties": {
+        "General": {
+            "type": "object",
+            "properties": {
+                "API": {"type": "string", "enum": ["Vulkan", "Direct3D 12"]},
+                "GPU": {"type": "string"}
+            },
+            "required": ["API", "GPU"]
+        },
+        "Total": {"$ref": "#/$defs/Stats"},
+        "MemoryInfo": {
+            "type": "object",
+            "additionalProperties": {
+                "type": "object",
+                "properties": {
+                    "Flags": {
+                        "type": "array",
+                        "items": {"type": "string"}
+                    },
+                    "Size": {"type": "integer"},
+                    "Budget": {
+                        "type": "object",
+                        "properties": {
+                            "BudgetBytes": {"type": "integer"},
+                            "UsageBytes": {"type": "integer"}
+                        },
+                        "additionalProperties": false
+                    },
+                    "Stats": {"$ref": "#/$defs/Stats"},
+                    "MemoryPools": {
+                        "type": "object",
+                        "additionalProperties": {
+                            "type": "object",
+                            "properties": {
+                                "Flags": {
+                                    "type": "array",
+                                    "items": {"type": "string"}
+                                },
+                                "Stats": {"$ref": "#/$defs/Stats"}
+                            },
+                            "additionalProperties": false
+                        }
+                    }
+                },
+                "required": ["Budget", "Stats"],
+                "additionalProperties": false
+            }
+        },
+        "DefaultPools": {
+            "type": "object",
+            "additionalProperties": {
+                "type": "object",
+                "properties": {
+                    "PreferredBlockSize": {"type": "integer"},
+                    "Blocks": {
+                        "type": "object",
+                        "propertyNames": {"pattern": "[0-9]+"},
+                        "additionalProperties": {"$ref": "#/$defs/Block"}
+                    },
+                    "DedicatedAllocations": {
+                        "type": "array",
+                        "items": {"$ref": "#/$defs/DedicatedAllocation"}
+                    }
+                }
+            }
+        },
+        "CustomPools": {
+            "type": "object",
+            "additionalProperties": {
+                "type": "array",
+                "items": {
+                    "type": "object",
+                    "properties": {
+                        "Name": {"type": "string"},
+                        "Flags": {"type": "array"},
+                        "PreferredBlockSize": {"type": "integer"},
+                        "Blocks": {
+                            "type": "object",
+                            "additionalProperties": {"$ref": "#/$defs/Block"}
+                        },
+                        "DedicatedAllocations": {
+                            "type": "array",
+                            "items": {"$ref": "#/$defs/DedicatedAllocation"}
+                        }
+                    },
+                    "required": ["PreferredBlockSize"],
+                    "additionalProperties": false
+                }
+            }
+        }
+    },
+    "required": ["General", "Total", "MemoryInfo"],
+    "additionalProperties": false,
+    "$defs": {
+        "CustomData": {
+            "type": "string",
+            "pattern": "^[0-9a-zA-Z]+$"
+        },
+        "Stats": {
+            "type": "object",
+            "properties": {
+                "BlockCount": {"type": "integer"},
+                "BlockBytes": {"type": "integer"},
+                "AllocationCount": {"type": "integer"},
+                "AllocationBytes": {"type": "integer"},
+                "UnusedRangeCount": {"type": "integer"},
+                "AllocationSizeMin": {"type": "integer"},
+                "AllocationSizeMax": {"type": "integer"},
+                "UnusedRangeSizeMin": {"type": "integer"},
+                "UnusedRangeSizeMax": {"type": "integer"}
+            },
+            "required": [
+                "BlockCount", "BlockBytes",
+                "AllocationCount", "AllocationBytes",
+                "UnusedRangeCount"
+            ],
+            "additionalProperties": false
+        },
+        "Block": {
+            "type": "object",
+            "properties": {
+                "MapRefCount": {"type": "integer"},
+                "TotalBytes": {"type": "integer"},
+                "UnusedBytes": {"type": "integer"},
+                "Allocations": {"type": "integer"},
+                "UnusedRanges": {"type": "integer"},
+                "Suballocations": {"type": "array", "items": {"$ref": "#/$defs/Suballocation"}}
+            },
+            "required": ["TotalBytes", "UnusedBytes", "Allocations", "UnusedRanges"]
+        },
+        "DedicatedAllocation": {
+            "type": "object",
+            "properties": {
+                "Type": {"type": "string"},
+                "Size": {"type": "integer"},
+                "Usage": {"type": "integer"},
+                "CustomData": {"$ref": "#/$defs/CustomData"},
+                "Name": {"type": "string"},
+                "Layout": {"type": "integer"}
+            },
+            "required": ["Type", "Size"],
+            "additionalProperties": false
+        },
+        "Suballocation": {
+            "type": "object",
+            "properties": {
+                "Offset": {"type": "integer"},
+                "Type": {"type": "string"},
+                "Size": {"type": "integer"},
+                "Usage": {"type": "integer"},
+                "CustomData": {"$ref": "#/$defs/CustomData"},
+                "Name": {"type": "string"},
+                "Layout": {"type": "integer"}
+            },
+            "required": ["Offset", "Type", "Size"],
+            "additionalProperties": false
+        }
+    }
+}
diff --git a/tools/GpuMemDumpVis/GpuMemDumpVis.py b/tools/GpuMemDumpVis/GpuMemDumpVis.py
index 1d75b82..42800ea 100644
--- a/tools/GpuMemDumpVis/GpuMemDumpVis.py
+++ b/tools/GpuMemDumpVis/GpuMemDumpVis.py
@@ -106,9 +106,9 @@
     maxBlockSize = 0
     # Get height occupied by every memory pool
     for poolData in data.values():
-        height += IMG_MARGIN + FONT_SIZE
-        height += len(poolData['DedicatedAllocations']) * (IMG_MARGIN * 2 + FONT_SIZE + MAP_SIZE)
-        height += len(poolData['Blocks']) * (IMG_MARGIN * 2 + FONT_SIZE + MAP_SIZE)
+        height += FONT_SIZE + IMG_MARGIN # Memory pool title
+        height += len(poolData['Blocks']) * (FONT_SIZE + MAP_SIZE + IMG_MARGIN * 2)
+        height += len(poolData['DedicatedAllocations']) * (FONT_SIZE + MAP_SIZE + IMG_MARGIN * 2)
         # Get longest block size
         for dedicatedAlloc in poolData['DedicatedAllocations']:
             maxBlockSize = max(maxBlockSize, dedicatedAlloc['Size'])
@@ -116,16 +116,15 @@
             maxBlockSize = max(maxBlockSize, block['Size'])
         # Same for custom pools
         for customPoolData in poolData['CustomPools'].values():
-            height += len(customPoolData['DedicatedAllocations']) * (IMG_MARGIN * 2 + FONT_SIZE + MAP_SIZE)
-            height += len(customPoolData['Blocks']) * (IMG_MARGIN * 2 + FONT_SIZE + MAP_SIZE)
-            height += FONT_SIZE * 2 + IMG_MARGIN if len(customPoolData['DedicatedAllocations']) == 0 else 0
+            height += len(customPoolData['Blocks']) * (FONT_SIZE + MAP_SIZE + IMG_MARGIN * 2)
+            height += len(customPoolData['DedicatedAllocations']) * (FONT_SIZE + MAP_SIZE + IMG_MARGIN * 2)
             # Get longest block size
             for dedicatedAlloc in customPoolData['DedicatedAllocations']:
                 maxBlockSize = max(maxBlockSize, dedicatedAlloc['Size'])
             for block in customPoolData['Blocks']:
                 maxBlockSize = max(maxBlockSize, block['Size'])
 
-    return height + FONT_SIZE, (IMG_WIDTH - IMG_MARGIN * 2) / float(maxBlockSize)
+    return height, (IMG_WIDTH - IMG_MARGIN * 2) / float(maxBlockSize)
 
 def BytesToStr(bytes):
     if bytes < 1024:
@@ -306,7 +305,7 @@
                 draw.text((IMG_MARGIN, y), "Custom pool %s block %s" % (poolName, block['ID']), fill=COLOR_TEXT_H2, font=font)
                 y += FONT_SIZE + IMG_MARGIN
                 DrawBlock(draw, y, block, pixelsPerByte)
-                y += MAP_SIZE + IMG_MARGIN 
+                y += MAP_SIZE + IMG_MARGIN
             index = 0
             for dedicatedAlloc in pool['DedicatedAllocations']:
                 draw.text((IMG_MARGIN, y), "Custom pool %s dedicated allocation %d" % (poolName, index), fill=COLOR_TEXT_H2, font=font)