diff --git a/index.ts b/index.ts
index 63f13b5..9cfbd80 100644
--- a/index.ts
+++ b/index.ts
@@ -883,8 +883,21 @@ class CanvasApp {
 
   private doSaveFile(filename: string): void {
     try {
-      const filePath = path.resolve(filename)
+      let filePath = path.resolve(filename)
       const data = this.toFileData()
+      //check if filename already exists
+      if (fs.existsSync(filePath)) {
+        let counter = 1
+        let newFilePath = filePath
+        const ext = path.extname(filePath)
+        const baseName = path.basename(filePath, ext)
+        const dirName = path.dirname(filePath)
+        while (fs.existsSync(newFilePath)) {
+          newFilePath = path.join(dirName, `${baseName}(${counter})${ext}`)
+          counter++
+        }
+        filePath = newFilePath
+      }
       fs.writeFileSync(filePath, JSON.stringify(data, null, 2))
       this.currentFilePath = filePath
       this.saveStatusMessage = `Saved to ${path.basename(filePath)}`