MP4
MP4 video
MP4 is the video container everything plays. It normally holds H.264 video and AAC audio, a pairing that phones, browsers, TVs and social networks all accept.
Opens in Every phone, browser, TV, console and editor
MP4 converterMP4 to FLV converter, without the upload.
Turn MP4 videos into FLV. It is converted in your browser, so the file never leaves your device.
Drop MP4 files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Convert to
- On your device · nothing is uploaded
- No account, no email
- Batch and ZIP download
- Free
How to convert MP4 to FLV
Add your MP4 videos
Drop MP4 files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
FLV is already chosen
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab and can take a while for large files.
Download
Save the FLV, or download everything as one ZIP if you converted several files.
Why ToAny
Private by construction
The MP4 to FLV converter is part of this page and runs inside your browser. Your videos are never sent to ToAny or to anyone else.
No upload, no queue
Nothing has to travel to a server and back, so work starts the moment you press Convert. How long it takes depends on your device and the size of the file.
Free, without an account
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
MP4 to FLV: what to expect
MP4 is a delivery format: other tools sometimes need audio only, a GIF, or a different container. FLV is still used by some live-streaming and recording tools. MP4 is at home in sharing and uploading video anywhere; FLV is the usual choice for nothing new; it survives in old downloads and stream recordings.
The defaults suit most files. Under Options you can lower the resolution, trade quality against file size, remove the sound and trim the start and end. This is demanding work for a browser: a long or high-resolution file can take several minutes, and your device does all of it, so keep the tab open.
This pair uses the compatibility engine, ffmpeg built for the browser, because FLV cannot be written by the browser's built-in codecs. It is a one-off download of about 10 MB that the browser keeps, it is slower than the built-in codecs, and it takes files up to 1 GB.
MP4 vs FLV
FLV
Flash video
FLV was the format behind web video in the Flash era. Flash Player was retired at the end of 2020, so FLV files no longer play in any browser.
Opens in VLC and little else since Flash Player was retired in 2020
FLV converter| MP4MP4 video | FLVFlash video | |
|---|---|---|
| Stands for | MPEG-4 Part 14 | Flash Video |
| Type | Video container | Video container |
| Compression | Lossy | Lossy |
| Usually contains | H.264 or H.265 video with AAC audio | Sorenson Spark, VP6 or H.264 video with MP3 or AAC audio |
| Introduced | 2001, by the Moving Picture Experts Group | 2002, by Macromedia (later Adobe) |
| Opens in | Every phone, browser, TV, console and editor | VLC and little else since Flash Player was retired in 2020 |
| Best for | Sharing and uploading video anywhere | Nothing new; it survives in old downloads and stream recordings |
| File extension | .mp4 | .flv |
Questions
Are my videos uploaded anywhere?
No. The MP4 to FLV conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
Does converting MP4 to FLV reduce quality?
It depends on what is inside the MP4. When its video and audio are already in a form FLV can hold, they can be carried over without being compressed again. Otherwise they are re-encoded, which costs a little quality. Under Options you can favour quality or a smaller file.
Can I convert several MP4 files at once?
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
How do I convert MP4 to FLV on Windows, Mac, iPhone or Android?
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the MP4 file, press Convert and save the FLV. There is nothing to install.
Is there a file size limit?
Yes. MP4 to FLV runs on the compatibility engine, which takes files up to 1 GB, and a long clip takes a while because it is slower than the browser's built-in codecs. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.