Convert MP4 to FLV online in seconds — free, with no sign-up. Your files are encrypted and deleted automatically after 24 hours.
MP4
MPEG-4 (H.264) — The universal video container — plays on virtually every device, browser and platform.
How to convert MP4 to FLV
- 1Upload your MP4 file
Click “Choose a file” or drag and drop your MP4 file onto the page — no sign-up or email needed.
- 2Convert to FLV
FLV is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your FLV file
Your FLV file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
Frequently asked questions
Does converting MP4 to FLV lose quality?
Converting MP4 to FLV keeps your content intact. We use high-quality defaults so your FLV file looks as close to the original as the format allows.
Is the MP4 to FLV converter free?
Yes — converting MP4 to FLV is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my MP4 files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert MP4 to FLV on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert MP4 to FLV?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert MP4 files to?
Besides FLV, you can convert MP4 to AAC, AVI, FLAC, GIF, JPG, M4A and more — see the full list of MP4 conversions below.
Other conversions
Last updated July 2026