How to convert FLV to ASF
To convert FLV to ASF, upload your FLV file, choose ASF as the output format and press Convert. The finished ASF file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns FLV videos into ASF files in your browser, with no software to install and no watermark. When the video and audio inside your FLV file can be placed in ASF as they are, the streams are copied without re-encoding, which is faster and keeps the original quality. Otherwise the video is re-encoded as Windows Media Video 8 with Windows Media Audio 2.
What you get with FLV to ASF
- Built for streaming over networks
- Plays in Windows Media Player
- Can hold multiple tracks and metadata
- Plays on: Windows Media Player, VLC and legacy Windows tools
What to expect from this conversion
- Expect a larger file than the FLV original, because ASF is a less efficient format for the same quality.
- ASF output uses Windows Media Video 8 and Windows Media Audio 2, the same streams WMV files carry.
- Flash is discontinued, and FLV is rarely supported any more, so converting to a modern format keeps the video playable.
- The first audio track is kept. Subtitle tracks, extra audio tracks and chapters are not included in the converted file.
FLV vs ASF
| Property | FLV | ASF |
|---|---|---|
| Full name | Flash Video | Advanced Systems Format |
| Released | 2002, Macromedia / Adobe | 1999, Microsoft |
| Generation | Legacy | Legacy |
| Typical file size | Small | Medium |
| Plays on | VLC, MPC-HC, ffplay and legacy RTMP tools; not supported by modern browsers | Windows Media Player, VLC and legacy Windows tools |
| Best for | older streaming servers and RTMP workflows; archival conversions | legacy Windows streaming; old media servers |
Steps to convert FLV to ASF
- Drop your FLV video file onto the converter, or click to choose it.
- Check that ASF is selected as the target and adjust the options if you want.
- Press Convert, then download your new ASF file when it finishes.
Tips for the best result
- Leave Fast mode on to keep the original quality whenever the streams can be copied.
- Pick a lower resolution if the file is for a phone or messaging app.
- Use Mute if you only need the picture.
Frequently asked questions
How do I convert FLV to ASF?
Upload your FLV file, make sure ASF is the selected target and press Convert. When the progress bar finishes, download the ASF file. No account or software is needed.
Is the FLV to ASF converter free?
Yes. It is free, with no watermark, no sign-up and no daily limit on how many files you convert. The site is supported by ads.
Will I lose quality when converting FLV to ASF?
Not necessarily. If the video and audio streams already fit inside ASF, they are copied without re-encoding, so quality stays identical. If the file has to be re-encoded, the High setting keeps almost all visible detail, while Small trades some detail for a smaller file.
Why is my ASF file larger than the FLV original?
Expect a larger file than the FLV original, because ASF is a less efficient format for the same quality. Choosing a lower quality or resolution reduces the size further.
Which devices can play ASF files?
ASF files play on Windows Media Player, VLC and legacy Windows tools.
How large a file can I upload?
You can upload videos up to 500 MB. Files are deleted from the server about 30 minutes after conversion.