How to convert a .LSX file online
Three steps, all tab.
Open your file
Drop your .LSX file and every video, audio and subtitle track inside is listed with its codec, resolution, frame rate and language.
Preview
See frames from across your .LSX file before you convert, even when your browser can't play the codec inside.
Convert
Pick MP4, WEBM or MP3, or repack to MKV without re-encoding. Play the result right here, then download it.
What is a .LSX file?
Everything worth knowing about Advanced Streaming Redirector File.
An LSX file is a small text file that tells Windows Media Player where to find a streaming audio or video source. It contains no media data, only a URL pointer. Open it with Windows Media Player or rename it to .asx and use VLC. Most LSX files no longer play because the mms:// protocol they relied on was deprecated around 2013.
Programs that open .LSX files
- Windows
- Windows Media Player, VLC media player, Notepad / any text editor
- macOS
- VLC media player
- Linux
- VLC media player
| Full name | Advanced Streaming Redirector File |
|---|---|
| Developer | Microsoft |
| First released | late 1990s, with Windows Media Player 6.x |
| Category | Audio & Video |
| MIME type | video/x-ms-wvx |
Related viewers
Other free tools to open and preview your files.
Is my .LSX file uploaded to a server?
No. Your .LSX file is converted for you. The converted file is created in memory,.
Why is conversion slower than desktop software?
Browsers give web pages a single CPU core for this kind of work and no hardware video encoder. Short clips convert in seconds; for long 4K films a desktop app like HandBrake is faster. Use Start and Length to convert just the part you need.
Which output format should I pick?
MP4 plays on every phone, TV and browser. WEBM is an open format that's great for the web. MP3 keeps only the sound. MKV (no re-encode) is instant and lossless, but only changes the container.
Can I keep all audio tracks and subtitles?
The MKV (no re-encode) option copies every track as-is. MP4 and WEBM keep the first video and audio track, which is what most players use.
Why can't some files be converted?
Files protected with DRM (for example purchased iTunes .m4p songs or some .wmv rentals) are encrypted. We can show what's inside, but nobody can convert them without the key.
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