Convert any video file to FLV format online for free. Fast, secure, and easy-to-use video to FLV converter with no software installation required.
or click below to browse
Max file size: 50 MBMax duration: 30 min
Sign up for increased limitsA free account gets you up to 50 MB and 30 min.
Drag and drop your M4V file, or click to browse for it.
Choose FLV as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
Download your converted file instantly. The download link expires in 1 hour for security.
Our powerful servers process your files quickly, delivering converted files in seconds.
Convert your files completely free with no hidden costs or subscription fees.
Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
Works directly in your web browser. No software download or installation required.
How the two formats differ on the things that change your result.
| Specification | M4V (source) | FLV (result) |
|---|---|---|
| Container | MPEG-4 (Apple variant) | Flash Video |
| Developed by | Apple | Adobe (Macromedia) |
| Introduced | 2005 | 2002 |
| Video codecs | H.264 | H.264, Sorenson Spark, VP6 |
| Audio codecs | AAC, AC-3 | AAC, MP3 |
| Max resolution | 4K UHD | Full HD (1080p) |
| Typical bitrate (1080p) | 4–20 Mbps | 1–8 Mbps |
| Multiple audio tracks | Yes | No |
| Subtitle tracks | Embedded (soft) subtitles | Not supported |
| Chapter markers | Yes | No |
| Streaming optimized | Yes | Yes |
| Licensing | Patent-licensed | Proprietary |
| Plays natively on | Native: macOS, iOS · Needs a player: Web browsers, Windows, Android, Smart TVs | Needs a player: Windows, macOS |
| Best for | the Apple ecosystem, iTunes libraries, home theatre | legacy archives, web archives |
Both containers can carry H.264, so this conversion is largely a container change rather than a full re-encode. That keeps quality intact and makes it fast.
If the source has subtitles baked in as a separate track, they will not survive: FLV does not support embedded subtitle streams.
Alternate audio tracks are dropped, because FLV carries one audio stream where M4V allows several.
Resolution is capped by the target format. M4V handles up to 4K UHD material, while FLV is designed for Full HD (1080p), so higher-resolution sources are scaled down.
Expect the bitrate to move from roughly 12 Mbps to about 4.5 Mbps at 1080p, and file size to follow.
Converting M4V to FLV moves the video from the MPEG-4 (Apple variant) container, introduced in 2005, into Flash Video, which arrived in 2002. Whether the picture is re-encoded or copied across depends on the codecs both containers accept.
Developed by Apple in 2005, M4V carries H.264 video and AAC or AC-3 audio. That combination sets the upper bound on what any conversion can preserve.
FLV was introduced by Adobe (Macromedia) in 2002 and carries H.264, Sorenson Spark, or VP6 video with AAC or MP3 audio. No major platform plays it out of the box, so viewers need a media player such as VLC.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
Quick access to the most commonly used file conversions
And many more format conversions supported