diff --git a/Libraries/ActionSheetIOS/RCTActionSheetManager.m b/Libraries/ActionSheetIOS/RCTActionSheetManager.m
index a736387fe..56df9f38d 100644
--- a/Libraries/ActionSheetIOS/RCTActionSheetManager.m
+++ b/Libraries/ActionSheetIOS/RCTActionSheetManager.m
@@ -9,6 +9,7 @@
 
 #import "RCTActionSheetManager.h"
 
+#import "RCTConvert.h"
 #import "RCTLog.h"
 #import "RCTUtils.h"
 
@@ -72,13 +73,13 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(NSDictionary *)options
                   successCallback:(RCTResponseSenderBlock)successCallback)
 {
   NSMutableArray *items = [NSMutableArray array];
-  id message = options[@"message"];
-  id url = options[@"url"];
-  if ([message isKindOfClass:[NSString class]]) {
+  NSString *message = [RCTConvert NSString:options[@"message"]];
+  if (message) {
     [items addObject:message];
   }
-  if ([url isKindOfClass:[NSString class]]) {
-    [items addObject:[NSURL URLWithString:url]];
+  NSURL *URL = [RCTConvert NSURL:options[@"url"]];
+  if (URL) {
+    [items addObject:URL];
   }
   if ([items count] == 0) {
     failureCallback(@[@"No `url` or `message` to share"]);
diff --git a/Libraries/Image/RCTImageLoader.m b/Libraries/Image/RCTImageLoader.m
index 338475029..34a7dc2fc 100644
--- a/Libraries/Image/RCTImageLoader.m
+++ b/Libraries/Image/RCTImageLoader.m
@@ -127,7 +127,7 @@ static UIImage *RCTScaledImageForAsset(ALAssetRepresentation *representation,
                                     completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
 {
   if ([imageTag hasPrefix:@"assets-library://"]) {
-    [[self assetsLibrary] assetForURL:[NSURL URLWithString:imageTag] resultBlock:^(ALAsset *asset) {
+    [[self assetsLibrary] assetForURL:[RCTConvert NSURL:imageTag] resultBlock:^(ALAsset *asset) {
       if (asset) {
         // ALAssetLibrary API is async and will be multi-threaded. Loading a few full
         // resolution images at once will spike the memory up to store the image data,
@@ -210,7 +210,7 @@ static UIImage *RCTScaledImageForAsset(ALAssetRepresentation *representation,
     }];
     return ^{};
   } else if ([imageTag hasPrefix:@"http"]) {
-    NSURL *url = [NSURL URLWithString:imageTag];
+    NSURL *url = [RCTConvert NSURL:imageTag];
     if (!url) {
       NSString *errorMessage = [NSString stringWithFormat:@"Invalid URL: %@", imageTag];
       RCTDispatchCallbackOnMainQueue(completionBlock, RCTErrorWithMessage(errorMessage), nil);
diff --git a/Libraries/WebSocket/RCTWebSocketExecutor.m b/Libraries/WebSocket/RCTWebSocketExecutor.m
index 888333edb..df661a54b 100644
--- a/Libraries/WebSocket/RCTWebSocketExecutor.m
+++ b/Libraries/WebSocket/RCTWebSocketExecutor.m
@@ -13,6 +13,7 @@
 
 #import "RCTWebSocketExecutor.h"
 
+#import "RCTConvert.h"
 #import "RCTLog.h"
 #import "RCTSparseArray.h"
 #import "RCTUtils.h"
@@ -38,7 +39,7 @@ RCT_EXPORT_MODULE()
 
 - (instancetype)init
 {
-  return [self initWithURL:[NSURL URLWithString:@"http://localhost:8081/debugger-proxy"]];
+  return [self initWithURL:[RCTConvert NSURL:@"http://localhost:8081/debugger-proxy"]];
 }
 
 - (instancetype)initWithURL:(NSURL *)URL
diff --git a/React/Base/RCTBatchedBridge.m b/React/Base/RCTBatchedBridge.m
index 39717a796..194689e38 100644
--- a/React/Base/RCTBatchedBridge.m
+++ b/React/Base/RCTBatchedBridge.m
@@ -777,7 +777,7 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
     NSURL *bundleURL = _parentBridge.bundleURL;
     NSString *port = bundleURL.port ? [@":" stringByAppendingString:bundleURL.port.stringValue] : @"";
     NSString *URLString = [NSString stringWithFormat:@"%@://%@%@/profile", bundleURL.scheme, bundleURL.host, port];
-    NSURL *URL = [NSURL URLWithString:URLString];
+    NSURL *URL = [RCTConvert NSURL:URLString];
     NSMutableURLRequest *URLRequest = [NSMutableURLRequest requestWithURL:URL];
     URLRequest.HTTPMethod = @"POST";
     [URLRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
diff --git a/React/Base/RCTRedBox.m b/React/Base/RCTRedBox.m
index 12a36deec..901fa34dc 100644
--- a/React/Base/RCTRedBox.m
+++ b/React/Base/RCTRedBox.m
@@ -10,6 +10,7 @@
 #import "RCTRedBox.h"
 
 #import "RCTBridge.h"
+#import "RCTConvert.h"
 #import "RCTDefines.h"
 #import "RCTUtils.h"
 
@@ -102,7 +103,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   NSData *stackFrameJSON = [RCTJSONStringify(stackFrame, nil) dataUsingEncoding:NSUTF8StringEncoding];
   NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[stackFrameJSON length]];
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
-  request.URL = [NSURL URLWithString:@"http://localhost:8081/open-stack-frame"];
+  request.URL = [RCTConvert NSURL:@"http://localhost:8081/open-stack-frame"];
   request.HTTPMethod = @"POST";
   request.HTTPBody = stackFrameJSON;
   [request setValue:postLength forHTTPHeaderField:@"Content-Length"];