F4V
Flash MP4 Video
An MP4-based format Adobe created to replace FLV.
Commonly used for
Legacy web streaming video
F4V to MP4 Converter
Convert F4V files to MP4 free in your browser — no signup, no install, and the file is never uploaded to a server. MP4 opens almost anywhere, so the result works where F4V did not.
Completely free
Files are never uploaded
No signup required
Drop files or click to select
F4V → MP4
What changes in this conversion
- MP4 opens almost everywhere, so the converted file will work on devices and programs that refused the original F4V.
- Both F4V and MP4 are lossy, so re-encoding discards a little more picture detail on top of what was already lost. Converting once is fine; repeating it many times is not.
- The picture and sound are re-encoded to H.264 video with AAC audio inside the MP4 container, which is what makes the result play on the widest range of devices.
How to use
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Add your F4V file
Drag the F4V file onto the drop area above, or click it to pick a file from your device. You can add several files at once.
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Confirm MP4 as the output
MP4 is already selected as the output format on this page. You can pick the resolution. Encoding is the slowest part, so smaller resolutions finish sooner.
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Run the conversion
Press the convert button. Video is re-encoded frame by frame on your own machine, so a long clip can take several minutes. The tab has to stay open.
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Download the MP4 file
When it finishes, download the MP4 file. Converting multiple files gives you the option to download them together as a ZIP.
About these formats
MP4
MP4 Video
The most widely used video container, playable on virtually every device, platform, and browser. It typically carries H.264 video with AAC audio.
Commonly used for
YouTube uploads, smartphone recording, web video
Frequently asked questions
Is converting F4V to MP4 really free?
Yes. F4V to MP4 conversion is completely free with no signup, no watermark, and no daily limit on the free plan for ordinary use.
Are my F4V files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so the F4V file never leaves your device. That is also why it works without an internet connection once the page has loaded.
Is there a file size limit for F4V to MP4 conversion?
The free plan handles files up to 200MB. Because processing happens on your own device, very large files depend on your computer's memory rather than a server quota.
Convert F4V files to other formats
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