diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
index 3a0b0776907..eb76b4b2dfc 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
@@ -41752,6 +41752,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @Test
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @Test
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt
index b8f86096448..e6a94d26f33 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt
@@ -423,6 +423,12 @@ private val foldConstantLoweringPhase = makeBodyLoweringPhase(
     prerequisite = setOf(propertyAccessorInlinerLoweringPhase)
 )
 
+private val computeStringTrimPhase = makeJsModulePhase(
+    ::StringTrimLowering,
+    name = "StringTrimLowering",
+    description = "Compute trimIndent and trimMargin operations on constant strings"
+).toModuleLowering()
+
 private val localDelegatedPropertiesLoweringPhase = makeBodyLoweringPhase(
     { LocalDelegatedPropertiesLowering() },
     name = "LocalDelegatedPropertiesLowering",
@@ -816,6 +822,7 @@ private val loweringList = listOf<Lowering>(
     copyPropertyAccessorBodiesLoweringPass,
     booleanPropertyInExternalLowering,
     foldConstantLoweringPhase,
+    computeStringTrimPhase,
     privateMembersLoweringPhase,
     privateMemberUsagesLoweringPhase,
     exportedDefaultParameterStubPhase,
diff --git a/compiler/testData/codegen/box/strings/trimOptimization.kt b/compiler/testData/codegen/box/strings/trimOptimization.kt
new file mode 100644
index 00000000000..6db1be7f839
--- /dev/null
+++ b/compiler/testData/codegen/box/strings/trimOptimization.kt
@@ -0,0 +1,147 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: JS
+
+import kotlin.test.assertEquals
+
+// CHECK_CONTAINS_NO_CALLS: trimIndentConstant
+fun trimIndentConstant(): String {
+    return """
+        Hello,
+        World
+    """.trimIndent()
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimIndentInterpolatedUsingConstant
+private const val HAS_INDENT = """Hello,
+        World"""
+fun trimIndentInterpolatedUsingConstant(): String {
+    return """
+        Hello,
+        $HAS_INDENT
+        World
+    """.trimIndent()
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimIndentReliesOnNestedStringBuilderFlatteningAndConstantConcatenation
+private const val SPACES = "    "
+private const val HELLO = "Hello"
+private const val WORLD = "World"
+fun trimIndentReliesOnNestedStringBuilderFlatteningAndConstantConcatenation(): String {
+    return ("" + '\n' + SPACES + "${SPACES}Hey" + """
+        ${HELLO + HELLO},
+        ${WORLD + WORLD}
+""" + SPACES).trimIndent()
+}
+
+// CHECK_CALLED_IN_SCOPE: function=trimIndent scope=trimIndentNotConstant
+fun trimIndentNotConstant(arg: String): String {
+    return arg.trimIndent()
+}
+
+// CHECK_CALLED_IN_SCOPE: function=trimIndent scope=trimIndentInterpolated
+fun trimIndentInterpolated(arg: Int): String {
+    return """
+        Hello,
+        $arg
+    """.trimIndent()
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimMarginConstant
+fun trimMarginConstant(): String {
+    return """
+        |Hello,
+        |World
+    """.trimMargin()
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimMarginInterpolatedUsingConstant
+private const val HAS_MARGIN = """Hello,
+        |World"""
+fun trimMarginInterpolatedUsingConstant(): String {
+    return """
+        |Hello,
+        |$HAS_MARGIN
+        |World
+    """.trimMargin()
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimMarginReliesOnNestedStringBuilderFlatteningAndConstantConcatenation
+fun trimMarginReliesOnNestedStringBuilderFlatteningAndConstantConcatenation(): String {
+    return ("" + '\n' + SPACES + "${SPACES}|Hey" + """
+        |${HELLO + HELLO},
+        |${WORLD + WORLD}
+""" + SPACES).trimMargin()
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimMarginConstantCustomPrefix
+fun trimMarginConstantCustomPrefix(): String {
+    return """
+        ###Hello,
+        ###World
+    """.trimMargin(marginPrefix = "###")
+}
+
+// CHECK_CONTAINS_NO_CALLS: trimMarginConstantCustomPrefixInterpolatedUsingConstant
+private const val OCTOTHORPE = '#'
+fun trimMarginConstantCustomPrefixInterpolatedUsingConstant(): String {
+    return """
+        #@#Hello,
+        #@#World
+    """.trimMargin(marginPrefix = "$OCTOTHORPE@$OCTOTHORPE")
+}
+
+// CHECK_CALLED_IN_SCOPE: function=trimMargin$default scope=trimMarginNotConstant
+fun trimMarginNotConstant(arg: String): String {
+    return arg.trimMargin()
+}
+
+// CHECK_CALLED_IN_SCOPE: function=trimMargin scope=trimMarginNotConstantCustomPrefix
+fun trimMarginNotConstantCustomPrefix(arg: String): String {
+    return arg.trimMargin("###")
+}
+
+// CHECK_CALLED_IN_SCOPE: function=trimMargin$default scope=trimMarginInterpolated
+fun trimMarginInterpolated(arg: Int): String {
+    return """
+        |Hello,
+        |$arg
+    """.trimMargin()
+}
+
+// CHECK_CALLED_IN_SCOPE: function=trimMargin scope=trimMarginConstantWithNonConstantCustomPrefix
+fun trimMarginConstantWithNonConstantCustomPrefix(arg: String): String {
+    return """
+        |Hello,
+        |World
+    """.trimMargin(arg)
+}
+
+fun box(): String {
+
+    assertEquals("Hello,\nWorld", trimIndentConstant())
+    assertEquals("Hello,\nHello,\nWorld\nWorld", trimIndentInterpolatedUsingConstant())
+    assertEquals("Hey\nHelloHello,\nWorldWorld", trimIndentReliesOnNestedStringBuilderFlatteningAndConstantConcatenation())
+    assertEquals("Hello,\nWorld", trimIndentNotConstant("""
+        Hello,
+        World
+    """))
+    assertEquals("Hello,\n42", trimIndentInterpolated(42))
+
+    assertEquals("Hello,\nWorld", trimMarginConstant())
+    assertEquals("Hello,\nHello,\nWorld\nWorld", trimMarginInterpolatedUsingConstant())
+    assertEquals("Hey\nHelloHello,\nWorldWorld", trimMarginReliesOnNestedStringBuilderFlatteningAndConstantConcatenation())
+    assertEquals("Hello,\nWorld", trimMarginConstantCustomPrefix())
+    assertEquals("Hello,\nWorld", trimMarginConstantCustomPrefixInterpolatedUsingConstant())
+    assertEquals("Hello,\nWorld", trimMarginNotConstant("""
+        |Hello,
+        |World
+    """))
+    assertEquals("Hello,\nWorld", trimMarginNotConstantCustomPrefix("""
+        ###Hello,
+        ###World
+    """))
+    assertEquals("Hello,\n42", trimMarginInterpolated(42))
+    assertEquals("Hello,\nWorld", trimMarginConstantWithNonConstantCustomPrefix("|"))
+
+    return "OK"
+}
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
index e38618b4a41..02852e3c896 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
@@ -41590,6 +41590,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @Test
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @Test
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
index 5e0c0b463a0..6b0461c4367 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
@@ -41752,6 +41752,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @Test
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @Test
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
index 8d4101fe31d..3c4172e7f6b 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
@@ -33434,6 +33434,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
             runTest("compiler/testData/codegen/box/strings/twoArgumentNullableStringOperatorPlus.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java
index 99b87203de6..8623146aa1e 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java
@@ -27924,6 +27924,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
             runTest("compiler/testData/codegen/box/strings/twoArgumentNullableStringOperatorPlus.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
index 3321dd18736..eaed052c3b5 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
@@ -27330,6 +27330,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
             runTest("compiler/testData/codegen/box/strings/twoArgumentNullableStringOperatorPlus.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
index 89b7509d1a5..7f69511507f 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
@@ -27240,6 +27240,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
             runTest("compiler/testData/codegen/box/strings/twoArgumentNullableStringOperatorPlus.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
index 45508602005..75252979044 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
@@ -21164,6 +21164,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/strings/surrogatePair.kt");
         }
 
+        @TestMetadata("trimOptimization.kt")
+        public void testTrimOptimization() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/trimOptimization.kt");
+        }
+
         @TestMetadata("twoArgumentNullableStringOperatorPlus.kt")
         public void testTwoArgumentNullableStringOperatorPlus() throws Exception {
             runTest("compiler/testData/codegen/box/strings/twoArgumentNullableStringOperatorPlus.kt");