Turn WebM files into TS
Drop in a WebM and get a TS back. TS is the usual choice for chunks captured from a live stream. Worth knowing: a TS will not open in a browser tab, so it is a file for software rather than for the web. Your file never leaves your computer.
Need the other direction? Convert TS to WebM
How to convert WebM to TS
- 1 Drop your WebM .webm file onto the page, or click to browse for it.
- 2 Set the quality, or leave the default, which keeps the file small without anything showing.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the TS, or add more files and do the whole set in one go.
Why convert WebM to TS
- Built to survive a patchy signal and to be joined part way through.
- Segments concatenate cleanly without re-encoding.
- AVCHD camcorder and Blu-ray recorder output.
- WebM: safari came to it late, and playback is uneven on older devices.
WebM compared with TS
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | WebM | TS |
|---|---|---|
| File extension | .webm | .ts |
| Transparency | Yes | No |
| Browser support | All current browsers | No browser support |
| Introduced | 2010 | 1995 |
| Developed by | ISO/IEC MPEG |
Quality and what changes
Both formats are lossy, so this is a second generation of compression: the WebM is decoded back to pixels that already carry its artefacts, and TS then compresses that. The damage compounds rather than cancelling out, which is why repeated round trips visibly degrade an image. Encode at a higher quality than the source used, and convert once from the best copy you have rather than from an already converted file.
- Browsers will not display a TS, so it downloads rather than opening in a tab.
- One TS limitation to keep in mind: packet overhead makes files larger than an equivalent MP4.
Questions about WebM to TS
Will converting WebM to TS lose quality?
A little. Both formats are lossy, so the file is decoded and compressed a second time and the two sets of artefacts add up. At a high quality setting the difference is hard to see, but avoid repeated round trips between lossy formats.
Can I open a TS in a browser?
No. No mainstream browser renders TS natively, so it will download rather than display. That is fine when the file is heading into desktop software or an archive, and a problem if it is going on a web page.
Is my WebM file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your WebM is read straight from your own disk, converted on your machine and handed back as a TS. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several WebM files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate TS downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.