FLV to MP4 Converter

🎬

Upload Video

Drag & drop or click to select a video file

  1. Upload an FLV file.
  2. Optionally trim the time range.
  3. Click Convert and wait for completion.
  4. Download the MP4 file.

FLV is a dead format

FLV is the Flash video format, obsolete since Flash was retired in 2020. Converting legacy FLV to MP4 is the only way to play it on today’s devices.

FLVLegacy downloaded files

Flash video, obsolete, no longer supported by modern browsers.

MP4 (H.264)Modern playback and sharing

The current universal standard, playable everywhere.

Tip

Converting FLV to MP4 re-muxes or re-encodes the audio/video.

Help

FAQ

Why does FLV conversion fail?Show
Some FLV files use uncommon codecs. Try trimming to a shorter segment first.
Is my file uploaded?Show
No. The conversion runs locally by default.

How to convert FLV to MP4

  1. Upload an FLV file.
  2. Optionally trim the time range.
  3. Click Convert and wait for completion.
  4. Download the MP4 file.

Privacy

Full guide

FLV to MP4 Converter

Convert legacy FLV/Flash videos to modern MP4 format.

Features

  • Flash Video Support: Handle old FLV files from web archives
  • Time Trimming: Extract only the segments you need
  • Quality Options: Adjust output quality and file size
  • 100% Local Processing: All conversion happens in your browser

Supported Formats

Input: FLV, Flash video files

Output: MP4 (H.264/AAC)

Tips

  • FLV files often use older codecs (VP6, Sorenson Spark)
  • If conversion fails, try a shorter segment
  • FLV from old YouTube downloads usually work well