FLV to MP4
Convert FLV Flash video to MP4 format online for free. Rescue old Flash-era videos and make them play on modern devices.
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About this tool
Convert FLV (Flash Video) files to modern MP4 format. FLV was the dominant video format of the internet from the mid-2000s to the early 2010s: YouTube and virtually every video site used Flash and FLV to deliver video before HTML5 took over. Adobe discontinued Flash in 2020, and FLV files are now unplayable on most modern systems since browsers and operating systems dropped Flash support. This converter re-encodes your FLV to H.264 MP4, giving these videos a second life on any modern device.
File size: MP4 output is typically similar in size to the FLV source. Low-resolution FLV files remain low-resolution after conversion.
Quality: Re-encoded to H.264 at CRF 23. FLV commonly uses H.263 or Sorenson Spark codec which must be transcoded rather than remuxed.
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How to convert
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1Upload your FLV file.
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2The converter re-encodes the Flash video to H.264 MP4.
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3Download an MP4 that plays on any modern device, browser, or media player.
help
FAQ
Why can my computer no longer play FLV?
Adobe Flash Player was officially discontinued in December 2020. All major browsers and operating systems removed Flash support, making FLV files unplayable without dedicated software.
Will old FLV video quality be preserved?
The conversion preserves the original video quality. Many old FLV files were encoded at low resolution, so the output quality reflects the source, not a limitation of the converter.
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Common use cases
- check_circle Recovering old YouTube downloads saved before the HTML5 transition
- check_circle Archiving Flash-era tutorial videos or presentations
- check_circle Converting FLV recordings from old screen capture software
- check_circle Making legacy web video content playable on modern devices
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