diff --git a/libraries/stdlib/common/src/generated/_OneToManyTitlecaseMappings.kt b/libraries/stdlib/common/src/generated/_OneToManyTitlecaseMappings.kt
index c347962bb9c..996b5216398 100644
--- a/libraries/stdlib/common/src/generated/_OneToManyTitlecaseMappings.kt
+++ b/libraries/stdlib/common/src/generated/_OneToManyTitlecaseMappings.kt
@@ -11,7 +11,6 @@ package kotlin.text
 //
 
 // 10 mappings totally
-@OptIn(ExperimentalStdlibApi::class)
 internal fun Char.titlecaseImpl(): String {
     val uppercase = uppercase()
     if (uppercase.length > 1) {
diff --git a/libraries/stdlib/js-ir/src/generated/_TitlecaseMappings.kt b/libraries/stdlib/js-ir/src/generated/_TitlecaseMappings.kt
index a6ad6ae2bad..281a620ec0e 100644
--- a/libraries/stdlib/js-ir/src/generated/_TitlecaseMappings.kt
+++ b/libraries/stdlib/js-ir/src/generated/_TitlecaseMappings.kt
@@ -11,7 +11,6 @@ package kotlin.text
 //
 
 // 4 ranges totally
-@OptIn(ExperimentalStdlibApi::class)
 internal fun Char.titlecaseCharImpl(): Char {
     val code = this.code
     // Letters repeating <Lu, Lt, Ll> sequence and code of the Lt is a multiple of 3, e.g. <DŽ, Dž, dž>
diff --git a/libraries/stdlib/js/src/generated/_TitlecaseMappings.kt b/libraries/stdlib/js/src/generated/_TitlecaseMappings.kt
index a6ad6ae2bad..281a620ec0e 100644
--- a/libraries/stdlib/js/src/generated/_TitlecaseMappings.kt
+++ b/libraries/stdlib/js/src/generated/_TitlecaseMappings.kt
@@ -11,7 +11,6 @@ package kotlin.text
 //
 
 // 4 ranges totally
-@OptIn(ExperimentalStdlibApi::class)
 internal fun Char.titlecaseCharImpl(): Char {
     val code = this.code
     // Letters repeating <Lu, Lt, Ll> sequence and code of the Lt is a multiple of 3, e.g. <DŽ, Dž, dž>
diff --git a/libraries/stdlib/js/src/kotlin/text/numberConversions.kt b/libraries/stdlib/js/src/kotlin/text/numberConversions.kt
index bacc3a6169c..b6d32d838c5 100644
--- a/libraries/stdlib/js/src/kotlin/text/numberConversions.kt
+++ b/libraries/stdlib/js/src/kotlin/text/numberConversions.kt
@@ -19,7 +19,6 @@ public actual inline fun String.toBoolean(): Boolean = this.toBoolean()
  *
  * There are also strict versions of the function available on non-nullable String, [toBooleanStrict] and [toBooleanStrictOrNull].
  */
-@OptIn(ExperimentalStdlibApi::class)
 @SinceKotlin("1.4")
 public actual fun String?.toBoolean(): Boolean = this != null && this.lowercase() == "true"
 
@@ -133,7 +132,6 @@ public actual inline fun Short.toString(radix: Int): String = this.toInt().toStr
 @SinceKotlin("1.2")
 public actual fun Int.toString(radix: Int): String = asDynamic().toString(checkRadix(radix))
 
-@OptIn(ExperimentalStdlibApi::class)
 private fun String.isNaN(): Boolean = when (this.lowercase()) {
     "nan", "+nan", "-nan" -> true
     else -> false
diff --git a/libraries/stdlib/js/src/kotlin/text/string.kt b/libraries/stdlib/js/src/kotlin/text/string.kt
index f054a464d49..f22383d9b62 100644
--- a/libraries/stdlib/js/src/kotlin/text/string.kt
+++ b/libraries/stdlib/js/src/kotlin/text/string.kt
@@ -240,7 +240,6 @@ public inline fun String.match(regex: String): Array<String>? = asDynamic().matc
 @kotlin.internal.InlineOnly
 internal inline fun String.nativeReplace(pattern: RegExp, replacement: String): String = asDynamic().replace(pattern, replacement)
 
-@OptIn(ExperimentalStdlibApi::class)
 @SinceKotlin("1.2")
 @Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
 public actual fun String.compareTo(other: String, ignoreCase: Boolean = false): Int {
diff --git a/libraries/stdlib/js/src/kotlin/text/stringsCode.kt b/libraries/stdlib/js/src/kotlin/text/stringsCode.kt
index 302b9943df8..57c8a96a0a9 100644
--- a/libraries/stdlib/js/src/kotlin/text/stringsCode.kt
+++ b/libraries/stdlib/js/src/kotlin/text/stringsCode.kt
@@ -54,7 +54,6 @@ public fun String.matches(regex: String): Boolean {
 
 public actual fun CharSequence.isBlank(): Boolean = length == 0 || (if (this is String) this else this.toString()).matches("^[\\s\\xA0]+$")
 
-@OptIn(ExperimentalStdlibApi::class)
 @Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
 public actual fun String?.equals(other: String?, ignoreCase: Boolean = false): Boolean =
     when {
diff --git a/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToMany/writers/OneToManyTitlecaseMappingsWriter.kt b/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToMany/writers/OneToManyTitlecaseMappingsWriter.kt
index e40e914061c..3fc919c7232 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToMany/writers/OneToManyTitlecaseMappingsWriter.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToMany/writers/OneToManyTitlecaseMappingsWriter.kt
@@ -23,7 +23,6 @@ internal class OneToManyTitlecaseMappingsWriter : OneToManyMappingsWriter {
     }
 
     private fun titlecaseImpl(apostropheN: String): String = """
-        @OptIn(ExperimentalStdlibApi::class)
         internal fun Char.titlecaseImpl(): String {
             val uppercase = uppercase()
             if (uppercase.length > 1) {
diff --git a/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToOne/writers/TitlecaseMappingsWriter.kt b/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToOne/writers/TitlecaseMappingsWriter.kt
index 86366c99270..4b7a84ec342 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToOne/writers/TitlecaseMappingsWriter.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/oneToOne/writers/TitlecaseMappingsWriter.kt
@@ -22,7 +22,6 @@ internal class TitlecaseMappingsWriter : MappingsWriter {
 
         writer.append(
             """
-            @OptIn(ExperimentalStdlibApi::class)
             internal fun Char.titlecaseCharImpl(): Char {
                 val code = this.code
                 // Letters repeating <Lu, Lt, Ll> sequence and code of the Lt is a multiple of 3, e.g. <DŽ, Dž, dž>
diff --git a/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/string/StringCasingTestGenerator.kt b/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/string/StringCasingTestGenerator.kt
index aab6a9e24ff..2c1c2fa18ad 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/string/StringCasingTestGenerator.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/generators/unicode/mappings/string/StringCasingTestGenerator.kt
@@ -67,7 +67,6 @@ internal class StringCasingTestGenerator(private val outputDir: File) {
         }
     }
 
-    @OptIn(ExperimentalStdlibApi::class)
     private fun test(rangesArrayName: String, functionName: String): String = """
         class ${functionName.replaceFirstChar { it.uppercase() }}Test {
             @Test