Convert FLV to MP4 Online
Need MP4 instead of FLV? This free converter changes FLV files into MP4 in seconds, right in your browser.
How to convert FLV to MP4
- Upload your FLV file. Drag it onto the box above or click to browse. Files up to 200 MB are accepted.
- Choose MP4 as the output. The target format is pre-selected on this page — just press “Convert now”.
- Download the result. Conversion runs on our own server and the download starts as soon as it is ready. Your files are deleted automatically.
Why convert FLV to MP4?
People convert FLV to MP4 mainly for compatibility. Deprecated — Flash is gone, so conversion to MP4 is almost always required. MP4, by contrast, is built for streaming, social media, mobile playback, archiving everyday video, and near-universal support. Typically pairs H.264/H.265 video with AAC audio.
FLV vs MP4: key differences
| FLV | MP4 | |
|---|---|---|
| File type | legacy container | lossy container |
| Typical use | legacy web video, old streaming archives | streaming, social media, mobile playback, archiving everyday video |
| Compatibility | Deprecated — Flash is gone, so conversion to MP4 is almost always required. | Near-universal support. Typically pairs H.264/H.265 video with AAC audio. |
Tips for a clean FLV to MP4 conversion
- Deprecated — Flash is gone, so conversion to MP4 is almost always required.
- Use the highest-quality source FLV you have — converting a compressed file again cannot restore lost detail.
- If you only need a smaller file, try a lower resolution or bitrate instead of a different format.
- Keep the original FLV until you have checked the converted MP4 opens the way you expect.
Frequently asked questions
How do I convert FLV to MP4?
Upload your FLV file to the converter on this page, make sure MP4 is selected as the output format and click “Convert now”. When the conversion finishes the download starts automatically.
Is this FLV to MP4 converter free?
Yes — it is completely free and needs no account. Files up to 200 MB are accepted, and heavy use is rate-limited so the service stays available for everyone.
Will converting FLV to MP4 reduce quality?
MP4 uses lossy compression, so the converted file is re-encoded. Quality loss is minimal at sensible settings, but keep the original FLV if you may need to convert again later.
What is a FLV file?
FLV is the format that powered the Flash-video era and early live streaming sites. Its technical name is Flash Video and it is typically used for legacy web video, old streaming archives.
What is a MP4 file?
MP4 is the universal video container, playable on virtually every device, browser, phone and smart TV. Its technical name is MPEG-4 Part 14 and it is typically used for streaming, social media, mobile playback, archiving everyday video.
Can I convert FLV to MP4 on my phone?
Yes. The converter runs in the browser on Android, iOS, Windows, macOS and Linux — no app installation is required.
Are my files kept on the server?
No. Uploaded files and converted results are deleted automatically a short time after the conversion finishes.