diff --git a/server/handles/fsmanage.go b/server/handles/fsmanage.go
index 9877b127..9349e7e2 100644
--- a/server/handles/fsmanage.go
+++ b/server/handles/fsmanage.go
@@ -56,9 +56,10 @@ func FsMkdir(c *gin.Context) {
 }
 
 type MoveCopyReq struct {
-	SrcDir string   `json:"src_dir"`
-	DstDir string   `json:"dst_dir"`
-	Names  []string `json:"names"`
+	SrcDir    string   `json:"src_dir"`
+	DstDir    string   `json:"dst_dir"`
+	Names     []string `json:"names"`
+	Overwrite bool     `json:"overwrite"`
 }
 
 func FsMove(c *gin.Context) {
@@ -86,6 +87,14 @@ func FsMove(c *gin.Context) {
 		common.ErrorResp(c, err, 403)
 		return
 	}
+	if !req.Overwrite {
+		for _, name := range req.Names {
+			if res, _ := fs.Get(c, stdpath.Join(dstDir, name), &fs.GetArgs{NoLog: true}); res != nil {
+				common.ErrorStrResp(c, "file exists", 403)
+				return
+			}
+		}
+	}
 	for i, name := range req.Names {
 		err := fs.Move(c, stdpath.Join(srcDir, name), dstDir, len(req.Names) > i+1)
 		if err != nil {
@@ -121,6 +130,14 @@ func FsCopy(c *gin.Context) {
 		common.ErrorResp(c, err, 403)
 		return
 	}
+	if !req.Overwrite {
+		for _, name := range req.Names {
+			if res, _ := fs.Get(c, stdpath.Join(dstDir, name), &fs.GetArgs{NoLog: true}); res != nil {
+				common.ErrorStrResp(c, "file exists", 403)
+				return
+			}
+		}
+	}
 	var addedTasks []task.TaskExtensionInfo
 	for i, name := range req.Names {
 		t, err := fs.Copy(c, stdpath.Join(srcDir, name), dstDir, len(req.Names) > i+1)
@@ -138,8 +155,9 @@ func FsCopy(c *gin.Context) {
 }
 
 type RenameReq struct {
-	Path string `json:"path"`
-	Name string `json:"name"`
+	Path      string `json:"path"`
+	Name      string `json:"name"`
+	Overwrite bool   `json:"overwrite"`
 }
 
 func FsRename(c *gin.Context) {
@@ -158,6 +176,15 @@ func FsRename(c *gin.Context) {
 		common.ErrorResp(c, err, 403)
 		return
 	}
+	if !req.Overwrite {
+		dstPath := stdpath.Join(stdpath.Dir(reqPath), req.Name)
+		if dstPath != reqPath {
+			if res, _ := fs.Get(c, dstPath, &fs.GetArgs{NoLog: true}); res != nil {
+				common.ErrorStrResp(c, "file exists", 403)
+				return
+			}
+		}
+	}
 	if err := fs.Rename(c, reqPath, req.Name); err != nil {
 		common.ErrorResp(c, err, 500)
 		return
diff --git a/server/handles/fsup.go b/server/handles/fsup.go
index a17c50f0..563afbcd 100644
--- a/server/handles/fsup.go
+++ b/server/handles/fsup.go
@@ -34,12 +34,20 @@ func FsStream(c *gin.Context) {
 		return
 	}
 	asTask := c.GetHeader("As-Task") == "true"
+	overwrite := c.GetHeader("Overwrite") != "false"
 	user := c.MustGet("user").(*model.User)
 	path, err = user.JoinPath(path)
 	if err != nil {
 		common.ErrorResp(c, err, 403)
 		return
 	}
+	if !overwrite {
+		if res, _ := fs.Get(c, path, &fs.GetArgs{NoLog: true}); res != nil {
+			_, _ = io.Copy(io.Discard, c.Request.Body)
+			common.ErrorStrResp(c, "file exists", 403)
+			return
+		}
+	}
 	dir, name := stdpath.Split(path)
 	sizeStr := c.GetHeader("Content-Length")
 	size, err := strconv.ParseInt(sizeStr, 10, 64)
@@ -85,12 +93,20 @@ func FsForm(c *gin.Context) {
 		return
 	}
 	asTask := c.GetHeader("As-Task") == "true"
+	overwrite := c.GetHeader("Overwrite") != "false"
 	user := c.MustGet("user").(*model.User)
 	path, err = user.JoinPath(path)
 	if err != nil {
 		common.ErrorResp(c, err, 403)
 		return
 	}
+	if !overwrite {
+		if res, _ := fs.Get(c, path, &fs.GetArgs{NoLog: true}); res != nil {
+			_, _ = io.Copy(io.Discard, c.Request.Body)
+			common.ErrorStrResp(c, "file exists", 403)
+			return
+		}
+	}
 	storage, err := fs.GetStorage(path, &fs.GetStoragesArgs{})
 	if err != nil {
 		common.ErrorResp(c, err, 400)