Happy Scribe offers a free service for editing video captions. You can run it in your browser and the controls are intuitive. You can edit captions, while watching synced video play back in the same view. Also, when you click or edit a caption in the editor, playback jumps to the corresponding point in your video. Finally, Happy Scribe offers tips on keeping captions readable, letting you know about very long lines or displaying too many characters to be read in the time the caption is displayed.