Convert FLV to MP4
Convert FLV files to MP4 in seconds. Free, no upload, no watermark. Trim, compress or edit before you convert.
or drag & drop videos, audio or images here, or paste with Ctrl+V
MP4 · MOV · MKV · AVI · WebM · WMV · FLV · GIF · MP3 · WAV · M4A · and 40+ more
- Files never leave your device
- No sign-up, no watermark
- Free forever
How to convert FLV to MP4
- Add your FLV fileClick “Choose files” or drag & drop your FLV file onto the page.
- Check the outputMP4 is pre-selected. Optionally trim, crop, compress or tweak quality in the tabs.
- Convert & downloadClick “Convert & download”. Your MP4 file is created on your device and saved instantly.
FLV vs MP4
Short answer: MP4 is the most widely supported video format. It plays on virtually every phone, browser, TV and editing app, and offers an excellent balance between quality and file size.
What is FLV?
FLV is the Flash Video format. It is still used for some live-streaming (RTMP) workflows.
What is MP4?
MP4 is the most widely supported video format. It plays on virtually every phone, browser, TV and editing app, and offers an excellent balance between quality and file size.
Quality
If the video and audio codecs inside your FLV file are already compatible with MP4, we copy them without re-encoding: it's instant and lossless. Otherwise we re-encode with a high-quality setting (adjustable with the Quality slider).
| FLV | MP4 | |
|---|---|---|
| Full name | Flash Video | MPEG-4 Part 14 |
| Type | video | video |
| Best for | RTMP streaming and legacy Flash players | Sharing, social media, websites and playback on any device |
| MIME type | video/x-flv | video/mp4 |
Last updated 2026-11-13
FLV to MP4: FAQ
Is this FLV to MP4 converter free?
Yes. Converting FLV to MP4 is completely free with no watermark, no sign-up and no file limits beyond what your device can handle. Optional Pro features like 4K export and AI subtitles are available if you need them, and a single 4K export can be unlocked without a subscription.
Are my FLV files uploaded to a server?
No, never. The conversion runs entirely in your web browser using FFmpeg compiled to WebAssembly. Your FLV file never leaves your computer or phone, and we never store it, which makes it private and fast.
Will I lose quality converting FLV to MP4?
If the video and audio codecs inside your FLV file are already compatible with MP4, we copy them without re-encoding: it's instant and lossless. Otherwise we re-encode with a high-quality setting (adjustable with the Quality slider).
How do I convert FLV to MP4 on iPhone or Android?
Open this page in Safari or Chrome on your phone, tap “Choose files”, pick your FLV file and tap “Convert & download”. No app install needed.
Can I convert multiple FLV files to MP4 at once?
Yes. Select several files and click “Convert all”. You can download them one by one or as a ZIP. Free users can batch-convert up to 5 files at a time; Pro removes the limit.
Can I edit the FLV before converting?
Yes: trim, cut, crop, rotate, resize, change speed, adjust colour, add text, music or subtitles, and more, all before you export to MP4.