The .flv filename extension and the FLV file format are associated with Adobe System's flash player. It is a container format primarily used for content delivery over the internet and other computer networks. It is an open file format and supports delivery of audio and video streams through players that are compatible with the specification. Flash video, or FLV, has been popularized on the internet by video streaming websites that encode their video in this format. Most web browsers have support for the format through web browser plugins with the exception of Google chrome which has native support for the format.
The MP4 file format and the .mp4 filename extension refer to the MPEG-4 part 14 digital multimedia format developed by the Moving Picture Experts Group. It is used as a multimedia container to wrap encoded digital video and audio streams, including subtitles and still images if required. In recent decades, the format has been popularized as one of the main standards for streaming media over the internet and other computer networks and for the digital distribution of large multimedia files. MP4 supports a large number of compression audio codecs allowing files in this format to maintain a relatively small size without discounting playback quality.
FreeFileConvert uses tuned encoding for FLV to MP4 conversions, preserving clarity while trimming file size. Finished videos play instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload FLV files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized MP4 results on any device you rely on.
Process up to 5 files sized 1024 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent MP4 videos with dependable progress tracking.
The FLV format is similar to the SWF file format (also owned by Adobe Systems) in the technique used to encode audio and video streams but differs slightly with multi byte storage in big endian byte order. FLV supports a number of codecs including but not limited to On2 VP6 and Sorensen Spark. FLV files can only have a single and synchronized audio and video stream. The format has a header tag followed by alternating blocks of back pointers and tags.
The MPEG-4 Part 14 is standardized as part of the MPEG-4 format in ISO/IEC 14496-14:2003. It is recognized as a container format for audio and video streams and references several filename extensions of which .mp4 is one. The MPEG-4 Part 14 is in many ways identical to Apple's QuickTime format which formed the basis of MPEG-4. However, there are slight differences in compatibility with other previously standardized MPEG features and the added support for IOD or initial object descriptors which describe elementary data streams and set profile information of the resources needed for content playback.
Upload your video file in the FLV format from your device.
Select MP4 as the output format and click Convert. Adjust optional settings if needed.
Download the converted video file. Each file stays available for up to 5 downloads.
legacy Flash or old web downloads often use FLV. MP4 (usually H.264/AAC) plays almost everywhere—phones, TVs, browsers, and social networks—so converting avoids “unsupported format” errors when sharing.
A re-encode always involves some compression. For sharing and playback the result looks close to the original at a sensible bitrate. Keep optional quality settings high when the clip will be edited further.
The main video and primary audio track are converted for compatibility. Soft subtitles and secondary audio streams may not carry over; burn in captions beforehand if they must appear in the MP4.
Upload your FLV file above, select MP4, and click Convert. Download when ready. Works from desktop or mobile browsers.
Yes. Add multiple files in one upload (within plan limits). Each finished MP4 stays available for up to 5 downloads.
Yes within the published free-tier size and daily limits.