MOV to FLV Converter
Convert MOV to FLV free — no upload, no signup
To convert MOV to FLV, drop your MOV video into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. H.264 MOVs are repackaged straight into FLV.
Drop videos here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
If the video already uses codecs that fit the new format, Fylo repackages it instantly with no quality loss.
Advanced
How to convert MOV to FLV
Add your MOV videos
Drag and drop MOV files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Choose quality (optional)
Balanced quality suits most videos. If the codecs already fit FLV, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each FLV file or all of them as one ZIP.
Why convert MOV to FLV?
Some RTMP streaming setups and legacy video platforms ingest FLV. Converting a MOV recording lets you feed it into those tools.
What happens when you convert MOV to FLV?
If the MOV contains H.264 and AAC, Fylo copies the streams into FLV with no quality loss. HEVC or ProRes footage is re-encoded to H.264 with 44.1 kHz AAC audio, since FLV can't carry those codecs.
How does Fylo convert MOV to FLV?
Fylo reads the MOV with ffmpeg compiled to WebAssembly and writes H.264 with AAC audio at 44.1 kHz, the sample rate Flash-era players expect. Most MOV files already contain H.264 video, so Fylo usually copies the video without re-encoding (and converts only the audio if needed), which is fast and lossless. Only the first video and audio track are kept, and the original resolution is preserved unless you pick 1080p, 720p or 480p under Advanced.
What's the difference between MOV and FLV?
MOV is the QuickTime File Format that Apple introduced in 1991. MP4 was later standardised on the same structure, so the two are close relatives. iPhones record MOV files (usually H.264 or HEVC video with AAC audio), and professional cameras and editors use MOV for high-quality ProRes footage.
FLV (Flash Video) was introduced with Flash Player 6 and 7 in 2002–2003 and became the format behind early YouTube, news sites and video portals. Later FLVs usually contain H.264 video and AAC audio — the same codecs as MP4.
Learn more: MOV format guide · FLV format guide
| Property | MOV | FLV |
|---|---|---|
| Developed by | Apple | Macromedia / Adobe |
| Introduced | 1991 | 2003 |
| Typical video codecs | H.264, HEVC, ProRes | H.264, Sorenson Spark, VP6 |
| Typical audio codecs | AAC, PCM | AAC, MP3 |
| Plays in web browsers | Partly (Safari; others only if H.264) | No (Flash Player ended in 2020) |
| Compatibility | Apple devices, editors; limited on Windows and Android | VLC and some desktop players; RTMP live-streaming tools |
| Best for | iPhone videos, professional editing (ProRes) | Old Flash archives, RTMP streaming workflows |
Frequently asked questions
Why was my iPhone video re-encoded?
Recent iPhones record HEVC, which FLV doesn't support, so it's converted to H.264.
Can I watch FLV in a browser?
No. Use VLC or convert back to MP4 for viewing.
Is my MOV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your MOV file is read directly from your device and never sent anywhere.
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