diff --git a/asm/build.gradle.kts b/asm/build.gradle.kts
index 3b696c74..9cb5d642 100644
--- a/asm/build.gradle.kts
+++ b/asm/build.gradle.kts
@@ -8,6 +8,7 @@ dependencies {
     api(libs.bundles.asm)
     api(libs.guice)
     api(libs.jackson.databind)
+    api(libs.netty.buffer)
 
     implementation(projects.buffer)
     implementation(projects.cache)
diff --git a/compress-cli/build.gradle.kts b/compress-cli/build.gradle.kts
index 73967c62..40709882 100644
--- a/compress-cli/build.gradle.kts
+++ b/compress-cli/build.gradle.kts
@@ -11,7 +11,9 @@ application {
 dependencies {
     api(libs.clikt)
 
+    implementation(projects.asm)
     implementation(projects.compress)
+    implementation(projects.util)
 }
 
 publishing {
@@ -24,7 +26,7 @@ publishing {
             description.set(
                 """
                 Tools for compressing and uncompressing headerless bzip2,
-                DEFLATE, gzip and LZMA files.
+                DEFLATE, gzip, LZMA, Pack200 and PackClass files.
             """.trimIndent()
             )
         }
diff --git a/compress-cli/src/main/kotlin/org/openrs2/compress/cli/CompressCommand.kt b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/CompressCommand.kt
index c77ea13c..eaf4a2da 100644
--- a/compress-cli/src/main/kotlin/org/openrs2/compress/cli/CompressCommand.kt
+++ b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/CompressCommand.kt
@@ -11,6 +11,10 @@ import org.openrs2.compress.cli.gzip.GunzipLaxCommand
 import org.openrs2.compress.cli.gzip.GzipCommand
 import org.openrs2.compress.cli.lzma.LzmaCommand
 import org.openrs2.compress.cli.lzma.UnlzmaCommand
+import org.openrs2.compress.cli.pack200.Pack200Command
+import org.openrs2.compress.cli.pack200.Unpack200Command
+import org.openrs2.compress.cli.packclass.PackClassCommand
+import org.openrs2.compress.cli.packclass.UnpackClassCommand
 
 public fun main(args: Array<String>): Unit = CompressCommand().main(args)
 
@@ -25,7 +29,11 @@ public class CompressCommand : NoOpCliktCommand(name = "compress") {
             GunzipCommand(),
             GunzipLaxCommand(),
             LzmaCommand(),
-            UnlzmaCommand()
+            UnlzmaCommand(),
+            Pack200Command(),
+            Unpack200Command(),
+            PackClassCommand(),
+            UnpackClassCommand()
         )
     }
 }
diff --git a/compress-cli/src/main/kotlin/org/openrs2/compress/cli/pack200/Pack200Command.kt b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/pack200/Pack200Command.kt
new file mode 100644
index 00000000..ec6855df
--- /dev/null
+++ b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/pack200/Pack200Command.kt
@@ -0,0 +1,24 @@
+package org.openrs2.compress.cli.pack200
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.options.option
+import com.github.ajalt.clikt.parameters.types.defaultStdin
+import com.github.ajalt.clikt.parameters.types.defaultStdout
+import com.github.ajalt.clikt.parameters.types.inputStream
+import com.github.ajalt.clikt.parameters.types.outputStream
+import org.openrs2.compress.gzip.Gzip
+import java.util.jar.JarInputStream
+import java.util.jar.Pack200
+
+public class Pack200Command : CliktCommand(name = "pack200") {
+    private val input by option().inputStream().defaultStdin()
+    private val output by option().outputStream().defaultStdout()
+
+    override fun run() {
+        JarInputStream(input).use { jarInput ->
+            Gzip.createHeaderlessOutputStream(output).use { gzipOutput ->
+                Pack200.newPacker().pack(jarInput, gzipOutput)
+            }
+        }
+    }
+}
diff --git a/compress-cli/src/main/kotlin/org/openrs2/compress/cli/pack200/Unpack200Command.kt b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/pack200/Unpack200Command.kt
new file mode 100644
index 00000000..d5df0b75
--- /dev/null
+++ b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/pack200/Unpack200Command.kt
@@ -0,0 +1,24 @@
+package org.openrs2.compress.cli.pack200
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.options.option
+import com.github.ajalt.clikt.parameters.types.defaultStdin
+import com.github.ajalt.clikt.parameters.types.defaultStdout
+import com.github.ajalt.clikt.parameters.types.inputStream
+import com.github.ajalt.clikt.parameters.types.outputStream
+import org.openrs2.compress.gzip.Gzip
+import org.openrs2.util.io.DeterministicJarOutputStream
+import java.util.jar.Pack200
+
+public class Unpack200Command : CliktCommand(name = "unpack200") {
+    private val input by option().inputStream().defaultStdin()
+    private val output by option().outputStream().defaultStdout()
+
+    override fun run() {
+        Gzip.createHeaderlessInputStream(input).use { gzipInput ->
+            DeterministicJarOutputStream(output).use { jarOutput ->
+                Pack200.newUnpacker().unpack(gzipInput, jarOutput)
+            }
+        }
+    }
+}
diff --git a/compress-cli/src/main/kotlin/org/openrs2/compress/cli/packclass/PackClassCommand.kt b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/packclass/PackClassCommand.kt
new file mode 100644
index 00000000..6335eac8
--- /dev/null
+++ b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/packclass/PackClassCommand.kt
@@ -0,0 +1,23 @@
+package org.openrs2.compress.cli.packclass
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.options.option
+import com.github.ajalt.clikt.parameters.types.defaultStdin
+import com.github.ajalt.clikt.parameters.types.defaultStdout
+import com.github.ajalt.clikt.parameters.types.inputStream
+import com.github.ajalt.clikt.parameters.types.outputStream
+import io.netty.buffer.ByteBufAllocator
+import org.openrs2.asm.classpath.ClassPath
+import org.openrs2.asm.io.JarLibraryReader
+import org.openrs2.asm.io.PackClassLibraryWriter
+
+public class PackClassCommand : CliktCommand(name = "packclass") {
+    private val input by option().inputStream().defaultStdin()
+    private val output by option().outputStream().defaultStdout()
+
+    override fun run() {
+        val classes = JarLibraryReader.read(input)
+        val classPath = ClassPath(ClassLoader.getPlatformClassLoader(), emptyList(), emptyList())
+        PackClassLibraryWriter(ByteBufAllocator.DEFAULT).write(output, classPath, classes)
+    }
+}
diff --git a/compress-cli/src/main/kotlin/org/openrs2/compress/cli/packclass/UnpackClassCommand.kt b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/packclass/UnpackClassCommand.kt
new file mode 100644
index 00000000..9f0bf291
--- /dev/null
+++ b/compress-cli/src/main/kotlin/org/openrs2/compress/cli/packclass/UnpackClassCommand.kt
@@ -0,0 +1,23 @@
+package org.openrs2.compress.cli.packclass
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.options.option
+import com.github.ajalt.clikt.parameters.types.defaultStdin
+import com.github.ajalt.clikt.parameters.types.defaultStdout
+import com.github.ajalt.clikt.parameters.types.inputStream
+import com.github.ajalt.clikt.parameters.types.outputStream
+import io.netty.buffer.ByteBufAllocator
+import org.openrs2.asm.classpath.ClassPath
+import org.openrs2.asm.io.JarLibraryWriter
+import org.openrs2.asm.io.PackClassLibraryReader
+
+public class UnpackClassCommand : CliktCommand(name = "unpackclass") {
+    private val input by option().inputStream().defaultStdin()
+    private val output by option().outputStream().defaultStdout()
+
+    override fun run() {
+        val classes = PackClassLibraryReader(ByteBufAllocator.DEFAULT).read(input)
+        val classPath = ClassPath(ClassLoader.getPlatformClassLoader(), emptyList(), emptyList())
+        JarLibraryWriter.write(output, classPath, classes)
+    }
+}