Convert MP4 to FLV
Convert MP4 files to FLV 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 MP4 to FLV
- Add your MP4 fileClick “Choose files” or drag & drop your MP4 file onto the page.
- Check the outputFLV is pre-selected. Optionally trim, crop, compress or tweak quality in the tabs.
- Convert & downloadClick “Convert & download”. Your FLV file is created on your device and saved instantly.
MP4 vs FLV
Short answer: 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.
What is FLV?
FLV is the Flash Video format. It is still used for some live-streaming (RTMP) workflows.
Quality
If the video and audio codecs inside your MP4 file are already compatible with FLV, 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).
| MP4 | FLV | |
|---|---|---|
| Full name | MPEG-4 Part 14 | Flash Video |
| Type | video | video |
| Best for | Sharing, social media, websites and playback on any device | RTMP streaming and legacy Flash players |
| MIME type | video/mp4 | video/x-flv |
Last updated 2026-11-13
MP4 to FLV: FAQ
Is this MP4 to FLV converter free?
Yes. Converting MP4 to FLV 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 MP4 files uploaded to a server?
No, never. The conversion runs entirely in your web browser using FFmpeg compiled to WebAssembly. Your MP4 file never leaves your computer or phone, and we never store it, which makes it private and fast.
Will I lose quality converting MP4 to FLV?
If the video and audio codecs inside your MP4 file are already compatible with FLV, 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 MP4 to FLV on iPhone or Android?
Open this page in Safari or Chrome on your phone, tap “Choose files”, pick your MP4 file and tap “Convert & download”. No app install needed.
Can I convert multiple MP4 files to FLV 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 MP4 before converting?
Yes: trim, cut, crop, rotate, resize, change speed, adjust colour, add text, music or subtitles, and more, all before you export to FLV.