Paste a thread you want to match. Write yours beside it, post by post, with X's own line wrapping and character counts.
Drafts you've opened in this browser. Other people only see the ones you send them.
Each post sits beside its match in the reference, with the difference in characters and lines.
Drop a photo or video on any post to see how the thread reads with it.
Share gives you a link. Whoever opens it gets their own editable copy, without your reference.