Simply type what you want to say, and if it exceeds the 140 character limit, it will append “…” to the end, so that the last “.” will be the 140th character. That way you’ll know how your post will look before putting it online.

To make this more than just a formula that chops off anything in excess of 140 characters, also included is a macro that will open up your Twitter home page and copy the text that is already pre-formatted to 140 characters or less. Now all you’ll have to do is paste the text into the “What are you doing?” box and click “Update”.

Download the file here.