diff --git a/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/CMDUtil.java b/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/CMDUtil.java
index f88f7e8..1e0e18c 100644
--- a/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/CMDUtil.java
+++ b/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/CMDUtil.java
@@ -40,11 +40,15 @@ public enum RecompressMode {
 
     private final CompressionUtil compUtil;
 
-    CMDUtil(RecompressMode recompressMode) {
+    CMDUtil(RecompressMode recompressMode, int passes) {
         recompress = recompressMode.ordinal() > RecompressMode.NONE.ordinal();
         final boolean zopfli = recompressMode.ordinal() >= RecompressMode.ZOPFLI.ordinal();
         final Strategy strat = recompressMode.ordinal() >= RecompressMode.ZOPFLI_EXTENSIVE.ordinal() ? Strategy.EXTENSIVE : Strategy.MULTI_CHEAP;
-        compUtil = recompress ? new CompressionUtil(true, true, recompressMode.ordinal() >= RecompressMode.ZOPFLI_VERY_EXTENSIVE.ordinal(), zopfli, strat, true, true) : null;
+        compUtil = recompress ? new CompressionUtil(true, true, recompressMode.ordinal() >= RecompressMode.ZOPFLI_VERY_EXTENSIVE.ordinal(), zopfli, passes, strat, true, true) : null;
+    }
+
+    CMDUtil(RecompressMode recompressMode) {
+        this(recompressMode, 20);
     }
 
     /** Read from the given input stream into the container, optimise, and write to the output stream */
diff --git a/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/Optimise.java b/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/Optimise.java
index c944541..209c5fe 100644
--- a/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/Optimise.java
+++ b/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/Optimise.java
@@ -27,9 +27,12 @@ class Optimise implements Callable<Integer> {
     @Option(names = { "--recompress-mode", "--mode", "-m" }, defaultValue = "NONE", description = "Enable various levels of recompression. Default: ${DEFAULT-VALUE}. Valid values: ${COMPLETION-CANDIDATES}")
     private RecompressMode recompressMode;
 
+    @Option(names = { "--zopfli-iter", "--iter", "-I" }, defaultValue = "20", description = "Zopfli iterations. More iterations increases time spent optimising files.")
+    int recompressZopfliPasses = 20;
+
     @Override
     public Integer call() throws Exception {
-        final CMDUtil deft = new CMDUtil(recompressMode);
+        final CMDUtil deft = new CMDUtil(recompressMode, recompressZopfliPasses);
         final boolean didOpt;
 
         try {
diff --git a/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/OptimiseFolder.java b/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/OptimiseFolder.java
index c5d06d9..2fa23a7 100644
--- a/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/OptimiseFolder.java
+++ b/deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/OptimiseFolder.java
@@ -24,9 +24,12 @@ class OptimiseFolder implements Callable<Integer> {
     @Option(names = { "--recompress-mode", "--mode", "-m" }, defaultValue = "NONE", description = "Enable various levels of recompression. Default: ${DEFAULT-VALUE}. Valid values: ${COMPLETION-CANDIDATES}")
     private RecompressMode recompressMode;
 
+    @Option(names = { "--zopfli-iter", "--iter", "-I" }, defaultValue = "20", description = "Zopfli iterations. More iterations increases time spent optimising files.")
+    int recompressZopfliPasses = 20;
+
     @Override
     public Integer call() throws Exception {
-        final CMDUtil deft = new CMDUtil(recompressMode);
+        final CMDUtil deft = new CMDUtil(recompressMode, recompressZopfliPasses);
         boolean didOpt = true;
 
         try