A long time ago in a galaxy far, far away… making file permissions more strict had some positive security benefits. Those days are long gone. So the answer is – do not change the default file permissions that your web host assigns to files and folders. 644 permissions for files is fine/safe. 755 permissions for folders is fine/safe. If you do decide to change the file permissions then use 604 for files. Do not change 755 folder permissions.