How to convert Flash Video (FLV) to MP4
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
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Convert Flash Video (FLV) to MP4
NexMedia converts Flash Video (FLV) to MP4 on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About Flash Video (FLV)
Flash Video (FLV) is the container Adobe Flash Player used to stream video on the web, typically with H.264 or the older Sorenson Spark and VP6 codecs.
Videos saved from websites of the Flash era and from some older streaming and recording tools.
Adobe ended Flash Player at the end of 2020 and browsers removed it, so FLV files need a converter or a desktop player such as VLC.
Convert FLV to MP4 online free, no account required — MP4 is a widely supported video container, usually holding H.264 video and AAC audio.
Change FLV to MP4 without losing quality — convert FLV to MP4 free in your browser.
Why won't my old FLV videos play anywhere anymore? Flash Player was retired at the end of 2020 and browsers dropped support, so the only practical way to keep them is converting to MP4.
About MP4
MP4 (MPEG-4 Part 14) is a container format standardised by ISO. It usually holds H.264 or H.265 video with AAC audio, and it can also carry subtitles and chapter markers.
It is the most widely supported video format: phones, browsers, smart TVs and video sites all play it.
The video inside an MP4 is almost always compressed with a lossy codec, so every re-encode loses a little quality.
Why convert video to MP4? Almost every device, browser and platform plays it, so an MP4 almost never needs a second conversion.
What changes when you convert FLV to MP4
- The FLV is re-encoded into MP4 at the default quality settings, so the result looks close to the original but is not bit-identical.
Settings you can change
Before you convert FLV to MP4, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted MP4 file is kept for 2 hours, then deleted.
FLV to MP4: questions and answers
Does converting FLV to MP4 reduce quality?
The FLV is re-encoded into MP4 at the default quality settings, so the result looks close to the original but is not bit-identical.
What is the difference between FLV and MP4?
FLV is the Flash Video format of the Adobe Flash Player era. MP4 is a widely supported video container, usually holding H.264 video and AAC audio.
Can I change the settings when converting FLV to MP4?
Before you convert FLV to MP4, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Do I need an account to convert FLV to MP4?
No. You can convert FLV to MP4 without an account; signing in raises the file-size and daily limits.
How long is my converted MP4 file kept?
The MP4 file you convert from FLV is kept for 2 hours, then deleted automatically.
When I convert FLV to MP4, is the video re-encoded?
The FLV is re-encoded into MP4 at the default quality settings, so the result looks close to the original but is not bit-identical.
Will converting FLV to MP4 change my original file?
No. The conversion reads your FLV and writes a new MP4 file, leaving your original FLV file untouched.