If you need to issue electronic certificates and rename the files by adding certificate numbers and names, instead of manually renaming each one, you can try this online tool by Jie Jie. Simply upload the files that need renaming, paste the text you want to add into the form below, and you can batch convert them. Plus, you can download all the files with just one click. It's completely free, supports Traditional Chinese, requires no registration, and is super fast.