diff --git a/java/google/registry/tools/server/CreateOrUpdatePremiumListAction.java b/java/google/registry/tools/server/CreateOrUpdatePremiumListAction.java
index 41058fd60..6415f6929 100644
--- a/java/google/registry/tools/server/CreateOrUpdatePremiumListAction.java
+++ b/java/google/registry/tools/server/CreateOrUpdatePremiumListAction.java
@@ -18,6 +18,7 @@ import com.google.common.collect.ImmutableMap;
 import google.registry.request.JsonResponse;
 import google.registry.request.Parameter;
 import google.registry.util.FormattingLogger;
+import java.util.logging.Level;
 import javax.inject.Inject;
 
 /**
@@ -27,6 +28,8 @@ public abstract class CreateOrUpdatePremiumListAction implements Runnable {
 
   protected static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
 
+  private static final int MAX_LOGGING_PREMIUM_LIST_LENGTH = 1000;
+
   public static final String NAME_PARAM = "name";
   public static final String INPUT_PARAM = "inputData";
 
@@ -47,6 +50,17 @@ public abstract class CreateOrUpdatePremiumListAction implements Runnable {
     }
   }
 
+  /** Logs the premium list data at INFO, truncated if too long. */
+  void logInputData() {
+    if (logger.isLoggable(Level.INFO)) {
+      logger.infofmt(
+          "Received the following input data: %s",
+          (inputData.length() < MAX_LOGGING_PREMIUM_LIST_LENGTH)
+              ? inputData
+              : (inputData.substring(0, MAX_LOGGING_PREMIUM_LIST_LENGTH) + "<truncated>"));
+    }
+  }
+
   /** Creates a new premium list or updates an existing one. */
   protected abstract void savePremiumList();
 }
diff --git a/java/google/registry/tools/server/CreatePremiumListAction.java b/java/google/registry/tools/server/CreatePremiumListAction.java
index 584ea54d7..392ebd812 100644
--- a/java/google/registry/tools/server/CreatePremiumListAction.java
+++ b/java/google/registry/tools/server/CreatePremiumListAction.java
@@ -55,7 +55,7 @@ public class CreatePremiumListAction extends CreateOrUpdatePremiumListAction {
     }
 
     logger.infofmt("Saving premium list for TLD %s", name);
-    logger.infofmt("Got the following input data: %s", inputData);
+    logInputData();
     List<String> inputDataPreProcessed =
         Splitter.on('\n').omitEmptyStrings().splitToList(inputData);
     PremiumList premiumList = new PremiumList.Builder().setName(name).build();
diff --git a/java/google/registry/tools/server/UpdatePremiumListAction.java b/java/google/registry/tools/server/UpdatePremiumListAction.java
index 1eee150a2..8c736a3d6 100644
--- a/java/google/registry/tools/server/UpdatePremiumListAction.java
+++ b/java/google/registry/tools/server/UpdatePremiumListAction.java
@@ -51,7 +51,7 @@ public class UpdatePremiumListAction extends CreateOrUpdatePremiumListAction {
         name);
 
     logger.infofmt("Updating premium list for TLD %s", name);
-    logger.infofmt("Got the following input data: %s", inputData);
+    logInputData();
     List<String> inputDataPreProcessed =
         Splitter.on('\n').omitEmptyStrings().splitToList(inputData);
     PremiumList newPremiumList =