The recommend format for closed captions is VTT (best cross browser and device support).
Can I use: Site that provides information on cross browser support of various web features such as VTT
- YouTube: Creating transcripts with YouTube!
Creates subtitles for uploaded videos automatically, but make sure you proof and edit – it will NOT be 100% correct
- IBM Watson: Create your transcripts
Transcribes speech to text for several major languages and includes some neat features
- Use Amara to reate subtitles and synch your audio
Freemium tool that helps you edit and synchronize subtitles
Fast high quality on demand trascriptions, closed captions, for foreign languae subtitles
Tool with various options to create transcripts automatically in various tools
Free service to convert from one format to another - e.g., SRT to VTT
Free tool to author and create subtitles