MP4 to FLV Converter

Convert MP4 to FLV online. MP4 and FLV are containers, while the video and audio codecs live inside them. Free batch processing with no signup or watermark.

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What changes when you convert MP4 to FLV?

MP4 and FLV are containers, while the video and audio codecs live inside them. Compatible streams may be copied; otherwise they are re-encoded for the selected FLV settings.

For the widest playback support, check that the selected video and audio codecs are accepted by the device or service that will receive the FLV file.

Add multiple videos and adjust the available video and audio codec settings before processing.

Open the finished FLV file and check fine details, layout and compatibility in the app where you plan to use it.

What is a MP4 file?

MP4 is a widely supported container for video and audio. Compatibility and file size depend on the codecs and settings used inside it, which is why MP4 with H.264 video and AAC audio is a common choice for sharing and uploading.

How to open a MP4 file

MP4 is widely supported by browsers, phones, smart TVs and desktop players. Playback still depends on the video and audio codecs stored inside the file.

What is a FLV file?

FLV (Flash Video) was the format of web video during the Adobe Flash era. Flash is now discontinued and modern browsers no longer play FLV, so old FLV clips usually need converting to MP4 to be watchable today.

How to open a FLV file

FLV no longer plays in browsers; use VLC to view it, or convert it to MP4 for phones, editors and everywhere else.

Frequently asked questions

Is it free to convert MP4 to FLV?

Yes. There is no sign-up, subscription or watermark on the converted file.

What happens to quality when MP4 becomes FLV?

MP4 and FLV are containers, while the video and audio codecs live inside them. Compatible streams may be copied; otherwise they are re-encoded for the selected FLV settings.

Which conversion options are available on this page?