Convert FLV to MP4
Convert FLV to MP4 online free. Fast, private and in your browser — no upload, no sign-up and no watermark. Batch FLV→MP4 conversion that works on any device.
To convert FLV to MP4, drop your FLV file into the converter above, then download the MP4 result. It's free, needs no sign-up, and there's no watermark. Conversion runs in your browser with on-device FFmpeg, so your files never leave your device.
Why convert FLV to MP4?
Convert FLV to MP4 to rescue old Flash-era videos. Browsers and devices dropped Flash years ago, so converting FLV to MP4 (H.264) is how you make those clips playable, uploadable and editable again today.
- Reviving old FLV downloads and screen recordings.
- Uploading legacy video to modern platforms.
- Editing Flash-era footage in current software.
FLV vs MP4
FLV · Flash Video
FLV is a legacy format from the Adobe Flash era. Flash is gone, so converting FLV to MP4 is how you keep old downloads and recordings playable on modern devices.
MP4 · MPEG-4 Part 14 (H.264)
MP4 with H.264 video is the most universally compatible video format — it plays everywhere and uploads cleanly to YouTube, Instagram, TikTok and messaging apps.
Need more options?
Video Converter
Convert video to MP4, WebM, MOV, MKV, GIF or MP3.
Open Video ConverterFLV to MP4 — frequently asked questions
How do I convert FLV to MP4?
Drop your FLV file (or several) into the converter, confirm MP4 is selected as the output, click convert, then download the MP4 file. The whole thing takes a few seconds.
Is this FLV to MP4 converter free?
Yes — it's completely free with no watermark and no sign-up required.
Is it safe to convert FLV to MP4 here?
Yes. Conversion runs on-device with FFmpeg compiled to WebAssembly, so your FLV file is never uploaded to a server.
Can I convert multiple FLV files at once?
Add your FLV file and convert it, then repeat for the next one — each runs locally in your browser.
Does it work on mobile?
Yes — the converter runs in any modern browser on phones, tablets and desktops.