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.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your MP4 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.
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Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
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How the two formats differ on the things that change your result.
| Specification | MP4 (source) | FLV (result) |
|---|---|---|
| Container | MPEG-4 Part 14 | Flash Video |
| Developed by | MPEG | Adobe (Macromedia) |
| Introduced | 2003 | 2002 |
| Video codecs | H.264, H.265, AV1 | H.264, Sorenson Spark, VP6 |
| Audio codecs | AAC, MP3, ALAC | AAC, MP3 |
| Max resolution | 8K UHD | Full HD (1080p) |
| Typical bitrate (1080p) | 5–20 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: Web browsers, Windows, macOS, iOS, Android, Smart TVs | Needs a player: Windows, macOS |
| Best for | web delivery, social media uploads, sharing with anyone | 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 MP4 allows several.
Resolution is capped by the target format. MP4 handles up to 8K UHD material, while FLV is designed for Full HD (1080p), so higher-resolution sources are scaled down.
Expect the bitrate to move from roughly 13 Mbps to about 4.5 Mbps at 1080p, and file size to follow.
Converting MP4 to FLV moves the video from the MPEG-4 Part 14 container, introduced in 2003, 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 MPEG in 2003, MP4 carries H.264, H.265, or AV1 video and AAC, MP3, or ALAC 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.
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