Convert FLV to MP4
Usually nothing is re-encoded: the tracks go into MP4 as they are, in seconds and with no loss.
They open in the converter with MP4 selected.
Browse filesFiles stay on your device.
What changes
FLV files normally carry H.264 video and AAC audio, which MP4 accepts as they are, so the converter copies the tracks untouched: in seconds and with no loss. If not, or if you change the quality, size, scale or trim, the video is decoded and compressed again, and loses a little more detail.
If it’s copied, it’s about the same size as the FLV: only the container changes. If it’s re-encoded, the size stays about the same.
Your browser may not be able to open FLV files, but the converter reads the file itself, so it can still convert it.
When it’s worth it
Choose MP4 for: Phones, websites, social networks, and TV. Small files for the quality, usually with H.264 or H.265 inside.
Stay with FLV for: Old Flash-era video archives.
How to convert FLV to MP4
- Drop the FLV files on this page, or browse for them. Up to 200 at once.
- The converter opens with the files loaded and MP4 selected.
- Press Convert, then save each file or all of them as a ZIP.
Questions
Does converting FLV to MP4 lose quality?
Usually not. With the default settings the tracks are copied without re-encoding. Quality only drops if you change the quality, size or trim, or if the file uses a codec MP4 doesn’t accept.
What is the MP4 format?
A container that holds a video track, one or more audio tracks and metadata, and nothing else: which codec sits inside is a separate question. H.264 or H.265 video with AAC audio is the combination almost everyone means by MP4.
What is the FLV format?
Flash Video, the container Adobe Flash Player used for web streaming, holding H.264 or VP6 with AAC audio. Flash is long gone, but a lot of video from that era is still only available as .flv.
Are the files uploaded?
No. The file is opened in this tab, converted here and saved from here. There’s no account and no watermark.
How many files can be converted at once?
Up to 200 per batch and about 2 GB per file, within the memory this device has available.