FLV to MP4
Convert Flash Video FLV files to modern H.264/AAC MP4 for easier playback and archiving.
About FLV to MP4
Convert Flash Video FLV files to modern H.264/AAC MP4 for easier playback and archiving. The source is decoded and exported as H.264 video with AAC audio in an MP4 container, with fast-start metadata for web playback.
How to use FLV to MP4
Upload a FLV media file and run the converter. FFmpeg decodes the source, creates a new MP4 output using the format settings described on this page, and ToolFlow returns the converted file.
When FLV to MP4 is useful
- Open or publish a FLV file in a workflow that expects MP4.
- Create a MP4 derivative for sharing while keeping the original FLV source archived.
- Handle a one-off FLV-to-MP4 conversion without installing a dedicated desktop converter.
Practical tips
- Keep the original media file until you have checked the converted result.
- Re-encoding can change quality and file size; avoid repeated conversions between lossy formats.
- Large or long media files take more server time, so use the shortest source that meets your needs.
FLV to MP4 FAQ
Does FLV to MP4 change my original input?
No. ToolFlow works on a temporary upload or submitted value and returns a separate result. Your local original is not overwritten.
Do I need to install software to use FLV to MP4?
No browser extension or desktop application is required. Some file tools depend on server modules such as FFmpeg, GD, Poppler or LibreOffice being enabled by the site operator.
Confidentialité et gestion des fichiers
Uploaded files are processed in temporary server storage. ToolFlow attempts to delete temporary source and output files after processing or delivery. Do not upload material you are not authorized to process. See the Politique de confidentialité for details.