diff --git a/BUILD.gn b/BUILD.gn
index 61f5862..d59faf4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -390,6 +390,8 @@
     "src/ast/workgroup_decoration.h",
     "src/castable.cc",
     "src/castable.h",
+    "src/demangler.cc",
+    "src/demangler.h",
     "src/diagnostic/diagnostic.cc",
     "src/diagnostic/diagnostic.h",
     "src/diagnostic/formatter.cc",
@@ -817,6 +819,7 @@
     "src/ast/variable_test.cc",
     "src/ast/workgroup_decoration_test.cc",
     "src/castable_test.cc",
+    "src/demangler_test.cc",
     "src/diagnostic/formatter_test.cc",
     "src/diagnostic/printer_test.cc",
     "src/inspector/inspector_test.cc",
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a80cd1a..9a063af 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -211,6 +211,8 @@
   ast/workgroup_decoration.h
   castable.cc
   castable.h
+  demangler.cc
+  demangler.h;
   diagnostic/diagnostic.cc
   diagnostic/diagnostic.h
   diagnostic/formatter.cc
@@ -454,6 +456,7 @@
     ast/variable_test.cc
     ast/workgroup_decoration_test.cc
     castable_test.cc
+    demangler_test.cc
     diagnostic/formatter_test.cc
     diagnostic/printer_test.cc
     inspector/inspector_test.cc
diff --git a/src/ast/function_test.cc b/src/ast/function_test.cc
index e341fc8..89bc80a 100644
--- a/src/ast/function_test.cc
+++ b/src/ast/function_test.cc
@@ -35,8 +35,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -57,8 +56,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -76,8 +74,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   Variable v(Source{}, "var", StorageClass::kInput, &i32, false, nullptr,
              ast::VariableDecorationList{});
@@ -102,8 +99,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   auto* loc1 = create<Variable>(Source{}, "loc1", StorageClass::kInput, &i32,
                                 false, nullptr,
@@ -150,8 +146,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   auto* loc1 = create<Variable>(Source{}, "loc1", StorageClass::kInput, &i32,
                                 false, nullptr,
@@ -197,9 +192,8 @@
 TEST_F(FunctionTest, AddDuplicateEntryPoints) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
-  auto main_sym = m.RegisterSymbol("main");
+  auto func_sym = mod.RegisterSymbol("func");
+  auto main_sym = mod.RegisterSymbol("main");
 
   Function f(Source{}, func_sym, "func", VariableList{}, &void_type,
              create<BlockStatement>(), FunctionDecorationList{});
@@ -217,8 +211,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -237,8 +230,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("");
+  auto func_sym = mod.RegisterSymbol("");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -256,8 +248,7 @@
 TEST_F(FunctionTest, IsValid_MissingReturnType) {
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -273,8 +264,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -290,8 +280,7 @@
 TEST_F(FunctionTest, IsValid_InvalidParam) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone,
@@ -307,8 +296,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -329,8 +317,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -350,8 +337,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   auto* body = create<BlockStatement>();
   body->append(create<DiscardStatement>());
@@ -361,7 +347,7 @@
 
   std::ostringstream out;
   f.to_str(out, 2);
-  EXPECT_EQ(out.str(), R"(  Function tint_symbol_1 -> __void
+  EXPECT_EQ(demangle(out.str()), R"(  Function func -> __void
   ()
   {
     Discard{}
@@ -373,8 +359,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   auto* body = create<BlockStatement>();
   body->append(create<DiscardStatement>());
@@ -385,7 +370,7 @@
 
   std::ostringstream out;
   f.to_str(out, 2);
-  EXPECT_EQ(out.str(), R"(  Function tint_symbol_1 -> __void
+  EXPECT_EQ(demangle(out.str()), R"(  Function func -> __void
   WorkgroupDecoration{2 4 6}
   ()
   {
@@ -398,8 +383,7 @@
   type::Void void_type;
   type::I32 i32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var", StorageClass::kNone, &i32,
@@ -414,7 +398,7 @@
 
   std::ostringstream out;
   f.to_str(out, 2);
-  EXPECT_EQ(out.str(), R"(  Function tint_symbol_1 -> __void
+  EXPECT_EQ(demangle(out.str()), R"(  Function func -> __void
   (
     Variable{
       var
@@ -431,8 +415,7 @@
 TEST_F(FunctionTest, TypeName) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   Function f(Source{}, func_sym, "func", {}, &void_type,
              create<BlockStatement>(), FunctionDecorationList{});
@@ -444,8 +427,7 @@
   type::I32 i32;
   type::F32 f32;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   params.push_back(create<Variable>(Source{}, "var1", StorageClass::kNone, &i32,
@@ -463,8 +445,7 @@
 TEST_F(FunctionTest, GetLastStatement) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   auto* body = create<BlockStatement>();
@@ -479,8 +460,7 @@
 TEST_F(FunctionTest, GetLastStatement_nullptr) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   VariableList params;
   auto* body = create<BlockStatement>();
@@ -493,8 +473,7 @@
 TEST_F(FunctionTest, WorkgroupSize_NoneSet) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   Function f(Source{}, func_sym, "func", {}, &void_type,
              create<BlockStatement>(), FunctionDecorationList{});
@@ -510,8 +489,7 @@
 TEST_F(FunctionTest, WorkgroupSize) {
   type::Void void_type;
 
-  Module m;
-  auto func_sym = m.RegisterSymbol("func");
+  auto func_sym = mod.RegisterSymbol("func");
 
   Function f(Source{}, func_sym, "func", {}, &void_type,
              create<BlockStatement>(),
diff --git a/src/ast/test_helper.h b/src/ast/test_helper.h
index bb558e2..126171f 100644
--- a/src/ast/test_helper.h
+++ b/src/ast/test_helper.h
@@ -20,6 +20,7 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/module.h"
+#include "src/demangler.h"
 
 namespace tint {
 namespace ast {
@@ -40,8 +41,17 @@
     return mod.create<T>(std::forward<ARGS>(args)...);
   }
 
+  /// Demangles the given string
+  /// @param s the string to demangle
+  /// @returns the demangled string
+  std::string demangle(const std::string& s) {
+    return demanger.Demangle(mod, s);
+  }
+
   /// The module
   Module mod;
+  /// A demangler
+  Demangler demanger;
 };
 using TestHelper = TestHelperBase<testing::Test>;
 
diff --git a/src/demangler.cc b/src/demangler.cc
new file mode 100644
index 0000000..c874d26
--- /dev/null
+++ b/src/demangler.cc
@@ -0,0 +1,58 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/demangler.h"
+
+namespace tint {
+namespace {
+
+constexpr char kSymbol[] = "tint_symbol_";
+constexpr size_t kSymbolLen = sizeof(kSymbol) - 1;
+
+}  // namespace
+
+Demangler::Demangler() = default;
+
+Demangler::~Demangler() = default;
+
+std::string Demangler::Demangle(const ast::Module& mod,
+                                const std::string& str) const {
+  auto ret = str;
+
+  size_t pos = 0;
+  for (;;) {
+    auto idx = ret.find(kSymbol, pos);
+    if (idx == std::string::npos)
+      break;
+
+    auto start_idx = idx + kSymbolLen;
+    auto end_idx = start_idx;
+    while (ret[end_idx] >= '0' && ret[end_idx] <= '9') {
+      end_idx++;
+    }
+    auto len = end_idx - start_idx;
+
+    auto id = ret.substr(start_idx, len);
+
+    Symbol sym(std::stoi(id));
+    auto name = mod.SymbolToName(sym);
+    ret.replace(idx, end_idx - idx, name);
+
+    pos = idx + name.length();
+  }
+
+  return ret;
+}
+
+}  // namespace tint
diff --git a/src/demangler.h b/src/demangler.h
new file mode 100644
index 0000000..23f9a2e
--- /dev/null
+++ b/src/demangler.h
@@ -0,0 +1,41 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SRC_DEMANGLER_H_
+#define SRC_DEMANGLER_H_
+
+#include <string>
+
+#include "src/ast/module.h"
+
+namespace tint {
+
+/// Helper to demangle strings and replace symbols with original names
+class Demangler {
+ public:
+  /// Constructor
+  Demangler();
+  /// Destructor
+  ~Demangler();
+
+  /// Transforms given string and replaces any symbols with original names
+  /// @param mod the module where the symbols are registered
+  /// @param str the string to replace
+  /// @returns the string with any symbol replacements performed.
+  std::string Demangle(const ast::Module& mod, const std::string& str) const;
+};
+
+}  // namespace tint
+
+#endif  // SRC_DEMANGLER_H_
diff --git a/src/demangler_test.cc b/src/demangler_test.cc
new file mode 100644
index 0000000..cc0477c
--- /dev/null
+++ b/src/demangler_test.cc
@@ -0,0 +1,52 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/demangler.h"
+
+#include "gtest/gtest.h"
+
+namespace tint {
+namespace {
+
+using DemanglerTest = testing::Test;
+
+TEST_F(DemanglerTest, NoSymbols) {
+  ast::Module m;
+  m.RegisterSymbol("sym1");
+
+  Demangler d;
+  EXPECT_EQ("test str", d.Demangle(m, "test str"));
+}
+
+TEST_F(DemanglerTest, Symbol) {
+  ast::Module m;
+  m.RegisterSymbol("sym1");
+
+  Demangler d;
+  EXPECT_EQ("test sym1 str", d.Demangle(m, "test tint_symbol_1 str"));
+}
+
+TEST_F(DemanglerTest, MultipleSymbols) {
+  ast::Module m;
+  m.RegisterSymbol("sym1");
+  m.RegisterSymbol("sym2");
+
+  Demangler d;
+  EXPECT_EQ(
+      "test sym1 sym2 sym1 str",
+      d.Demangle(m, "test tint_symbol_1 tint_symbol_2 tint_symbol_1 str"));
+}
+
+}  // namespace
+}  // namespace tint
diff --git a/src/transform/first_index_offset_test.cc b/src/transform/first_index_offset_test.cc
index 7a27557..20fbb75 100644
--- a/src/transform/first_index_offset_test.cc
+++ b/src/transform/first_index_offset_test.cc
@@ -33,6 +33,7 @@
 #include "src/ast/type/u32_type.h"
 #include "src/ast/variable.h"
 #include "src/ast/variable_decoration.h"
+#include "src/demangler.h"
 #include "src/diagnostic/formatter.h"
 #include "src/source.h"
 #include "src/transform/manager.h"
@@ -154,7 +155,7 @@
     uniform
     __struct_TintFirstIndexOffsetData
   }
-  Function tint_symbol_1 -> __u32
+  Function test -> __u32
   ()
   {
     VariableDeclStatement{
@@ -182,7 +183,7 @@
   }
 }
 )";
-  EXPECT_EQ(got, expected);
+  EXPECT_EQ(Demangler().Demangle(result.module, got), expected);
 }
 
 TEST_F(FirstIndexOffsetTest, BasicModuleInstanceIndex) {
@@ -229,7 +230,7 @@
     uniform
     __struct_TintFirstIndexOffsetData
   }
-  Function tint_symbol_1 -> __u32
+  Function test -> __u32
   ()
   {
     VariableDeclStatement{
@@ -257,7 +258,7 @@
   }
 }
 )";
-  EXPECT_EQ(got, expected);
+  EXPECT_EQ(Demangler().Demangle(result.module, got), expected);
 }
 
 TEST_F(FirstIndexOffsetTest, BasicModuleBothIndex) {
@@ -317,7 +318,7 @@
     uniform
     __struct_TintFirstIndexOffsetData
   }
-  Function tint_symbol_1 -> __u32
+  Function test -> __u32
   ()
   {
     Return{
@@ -328,7 +329,7 @@
   }
 }
 )";
-  EXPECT_EQ(got, expected);
+  EXPECT_EQ(Demangler().Demangle(result.module, got), expected);
 
   EXPECT_TRUE(transform_ptr->HasVertexIndex());
   EXPECT_EQ(transform_ptr->GetFirstVertexOffset(), 0u);
@@ -389,7 +390,7 @@
     uniform
     __struct_TintFirstIndexOffsetData
   }
-  Function tint_symbol_1 -> __u32
+  Function func1 -> __u32
   ()
   {
     VariableDeclStatement{
@@ -415,7 +416,7 @@
       }
     }
   }
-  Function tint_symbol_2 -> __u32
+  Function func2 -> __u32
   ()
   {
     Return{
@@ -430,7 +431,7 @@
   }
 }
 )";
-  EXPECT_EQ(got, expected);
+  EXPECT_EQ(Demangler().Demangle(result.module, got), expected);
 }
 
 }  // namespace