Castmate
How to cast and download TED videos
Tested October 27, 2026 with Castmate for Chrome.
- Open the TED video in Chrome and start playing it.
- Click the Castmate icon in the toolbar. The video shows up with its title, length and quality.
- Press Cast and pick your TV. The TV plays the stream itself, in full quality, so you can close the laptop.
- Or press Download, then Save to computer, to keep it as one MP4 file. (Saving comes with the next Castmate update, 1.0.5.)
What we found
- Casting works directly. The TV fetches the stream itself; nothing else needs to run on your computer.
- Saving works: one MP4 file with picture and sound.
Test details
| Tested | October 27, 2026, Castmate 1.0.5, Chrome on macOS |
|---|---|
| Stream | HLS stream (.m3u8) |
| Best quality found | 1080p H.264 |
| TV | onn. 4K Plus (Google TV, Chromecast built in): played directly from the site |
| Saved | first 114 s as MP4, picture and sound |
If it stops working, press Didn't work? Report it under the video in Castmate and we'll look at TED again.
Only save videos you have the right to keep. TED is a trademark of its owner; Castmate isn't affiliated with or endorsed by TED. All guides ยท Support