FLV to MP4 Converter
Rescue Flash videos now that Flash Player is gone.
Free · No upload · No sign-up · No watermark
How to convert FLV to MP4
- 01
Open your FLV file
Drop the FLV or F4V. Cutlia opens it on your device.
- 02
Keep MP4 selected
It's already chosen. Pick a part or a smaller size if you like.
- 03
Convert and download
H.264 FLVs are copied in seconds; older Flash video is converted to H.264.
Why use Cutlia for this
Instant for H.264 FLVs
Most FLVs from the 2010s hold H.264 and AAC: both are copied into the MP4 byte for byte.
Older Flash codecs
Sorenson Spark video is converted to H.264, and MP3 sound to AAC.
Life after Flash
No browser plays Flash any more; as MP4 those videos play everywhere again.
Frequently asked questions
Why don't my FLV files play any more?
FLV was made for Adobe Flash Player, which was retired at the end of 2020 and is gone from every browser. MP4 holds the same video in a format everything plays.
Is FLV to MP4 lossless?
For H.264 FLVs, yes: picture and sound are copied as they are. Older Flash video is re-encoded once, in high quality.
Is my video uploaded to a server?
No. Cutlia processes your video directly in your browser using WebAssembly and your device's hardware. The file never leaves your computer or phone, so it stays completely private.
Is it really free?
Yes. Cutlia is free to use with no account, no trial and no watermark on your export. The site is paid for by the ads on it, and your files never leave your device.
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