diff --git a/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/ExternalAssetsPlugin.kt b/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/ExternalAssetsPlugin.kt
index fd53b18156..c263fa308b 100644
--- a/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/ExternalAssetsPlugin.kt
+++ b/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/ExternalAssetsPlugin.kt
@@ -14,10 +14,18 @@ import org.gradle.api.ExtensiblePolymorphicDomainObjectContainer
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.file.Directory
+import org.gradle.api.logging.Logger
 import org.gradle.api.model.ObjectFactory
 import org.gradle.api.provider.Provider
 import org.gradle.kotlin.dsl.dependencies
 import org.gradle.kotlin.dsl.newInstance
+import java.io.File
+import java.nio.file.AtomicMoveNotSupportedException
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+import java.util.zip.ZipOutputStream
 import javax.inject.Inject
 
 private fun Project.externalAssetsCacheDir(): Provider<Directory> =
@@ -76,8 +84,17 @@ abstract class ExternalAssetsExtension @Inject constructor(
             logger = project.logger
         )
 
+        val jarFileName = if (config.excludeEntryPrefixes.isEmpty()) {
+            config.jarName
+        } else {
+            val original = cacheDir.resolve(config.jarName)
+            val stripped = cacheDir.resolve("${config.jarName.removeSuffix(".jar")}-stripped.jar")
+            stripJar(original, stripped, config.excludeEntryPrefixes, project.logger)
+            stripped.name
+        }
+
         val dep = project.dependencies.create(project.fileTree(cacheDir) {
-            include(config.jarName)
+            include(jarFileName)
         })
 
         project.dependencies {
@@ -86,6 +103,48 @@ abstract class ExternalAssetsExtension @Inject constructor(
     }
 }
 
+private fun stripJar(source: File, dest: File, excludePrefixes: List<String>, logger: Logger) {
+    val prefixesFile = File(dest.parentFile, "${dest.name}.prefixes")
+    val currentPrefixContent = excludePrefixes.sorted().joinToString("\n")
+    val upToDate = dest.exists()
+        && dest.lastModified() >= source.lastModified()
+        && prefixesFile.exists()
+        && prefixesFile.readText() == currentPrefixContent
+    if (upToDate) {
+        logger.lifecycle("Skipping strip of ${source.name}: stripped copy is up-to-date")
+        return
+    }
+    logger.lifecycle("Stripping ${excludePrefixes.size} prefix(es) from ${source.name}…")
+    val tmp = File(dest.parentFile, "${dest.name}.tmp")
+    try {
+        ZipInputStream(source.inputStream().buffered()).use { zin ->
+            ZipOutputStream(tmp.outputStream().buffered()).use { zout ->
+                var entry: ZipEntry? = zin.nextEntry
+                while (entry != null) {
+                    if (excludePrefixes.none { entry!!.name.startsWith(it) }) {
+                        zout.putNextEntry(ZipEntry(entry.name))
+                        zin.copyTo(zout)
+                        zout.closeEntry()
+                    }
+                    zin.closeEntry()
+                    entry = zin.nextEntry
+                }
+            }
+        }
+        try {
+            Files.move(tmp.toPath(), dest.toPath(), StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE)
+        } catch (_: AtomicMoveNotSupportedException) {
+            Files.move(tmp.toPath(), dest.toPath(), StandardCopyOption.REPLACE_EXISTING)
+        }
+        prefixesFile.writeText(currentPrefixContent)
+    } catch (e: Exception) {
+        tmp.delete()
+        throw e
+    }
+    val savedKb = (source.length() - dest.length()) / 1024
+    logger.lifecycle("Stripped ${source.name}: saved ${savedKb} KB (${source.length()} → ${dest.length()} bytes)")
+}
+
 /**
  * Plugin used to download files from external sources and package them as assets.
  *
diff --git a/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/extension/ExternalAssetsExtension.kt b/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/extension/ExternalAssetsExtension.kt
index e32f05df27..6f202ee4db 100644
--- a/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/extension/ExternalAssetsExtension.kt
+++ b/composite-builds/build-logic/plugins/src/main/java/com/itsaky/androidide/plugins/extension/ExternalAssetsExtension.kt
@@ -123,4 +123,11 @@ abstract class ExternalJarDependencyConfiguration @Inject constructor(
      * The name of the JAR file to be added to the dependencies.
      */
     var jarName: String = "${name}.jar"
+
+    /**
+     * Entry name prefixes to strip from the JAR before adding it as a dependency.
+     * Any ZIP entry whose name starts with one of these prefixes is excluded from the
+     * stripped copy (e.g. "org/jetbrains/kotlin/js/").
+     */
+    var excludeEntryPrefixes: List<String> = emptyList()
 }
\ No newline at end of file
diff --git a/subprojects/kotlin-analysis-api/build.gradle.kts b/subprojects/kotlin-analysis-api/build.gradle.kts
index 34e3e05a07..d674958397 100644
--- a/subprojects/kotlin-analysis-api/build.gradle.kts
+++ b/subprojects/kotlin-analysis-api/build.gradle.kts
@@ -23,5 +23,27 @@ externalAssets {
 				url = uri("$ktAndroidRepo/releases/download/$ktAndroidTag/$ktAndroidJarName"),
 				sha256Checksum = "2069ed685dafd6eed36ebe242004ed5e24e28360293117323e2c988afefa6767",
 			)
+		excludeEntryPrefixes = listOf(
+			// Kotlin/JS backend — not needed in an Android IDE
+			"org/jetbrains/kotlin/js/",
+			"META-INF/ir.serialization.js.kotlin_module",
+			"META-INF/checkers.js.kotlin_module",
+			"META-INF/compiler.common.js.kotlin_module",
+			"META-INF/js.ast.kotlin_module",
+			"META-INF/js.config.kotlin_module",
+			"META-INF/js.frontend.common.kotlin_module",
+			"META-INF/js.frontend.kotlin_module",
+			"META-INF/js.parser.kotlin_module",
+			"META-INF/js.serializer.kotlin_module",
+			// Kotlin/Native (konan) backend — not needed in an Android IDE
+			"org/jetbrains/kotlin/konan/",
+			"META-INF/checkers.native.kotlin_module",
+			"META-INF/compiler.common.native.kotlin_module",
+			"META-INF/decompiler-native.kotlin_module",
+			"META-INF/fir-native.kotlin_module",
+			"META-INF/frontend.native.kotlin_module",
+			"META-INF/ir.serialization.native.kotlin_module",
+			"META-INF/kotlin-native-utils.kotlin_module",
+		)
 	}
 }