Easy YouTube caption creator
The Easy YouTube caption creator is designed to make it very simple to create a caption text file (.sub format) that you can then add to YouTube video files that you have uploaded.
This is something of a one-trick pony; what it creates is not rocket science, it's just designed to make it a little easier (and hopefully will encourage you to caption more videos).
There's an overview of this tool on YouTube.
Note: this tool is no longer being developed as YouTube's automatic captioning has somewhat overtaken this tool. If you already have a transcript and if the audio in your video file is clear enough, YouTube can probably work out the timings automatically.
Please note that this page requires JavaScript for it to function.