Convert FLV to MP4
Turn your FLV file into an MP4 that plays where you need it, with nothing to install.
- Free to start
- Nothing to install
- Up to 1GB
How to convert FLV to MP4
Upload your FLV file
Drag and drop a FLV file to turn into MP4, or click to browse. Anything under 1GB, and nothing is installed.
Confirm MP4 as the output
MP4 is already selected, so there is nothing to configure. Switch to another format in the panel if FLV needs to go somewhere else.
Convert and download
We convert the FLV on our servers, usually in under a minute. Create a free account to download the MP4.
Why convert FLV to MP4?
FLV was built for the Flash player, which browsers dropped for good at the end of 2020. Any FLV you still have is an archive file that needs converting before it can be watched or edited.
The practical problem: No browser has played Flash video since 2020, so FLV is effectively unplayable on the web. Editors and phones will not open it. The old codecs inside look soft next to a modern H.264 encode.
MP4 solves that. Plays natively on every phone, browser, TV and editing app with no extra codecs. Every upload form accepts it, from YouTube and LinkedIn to Slack and email. H.264 keeps files small enough to send while still looking sharp at 1080p.
Flash died at the end of 2020, so an FLV file today is an archive that nothing will play. Converting to MP4 is the only way to keep the footage usable, and it is worth doing before the source drive is the last copy in existence.
Container
Typical codecs
Best for
Plays on
File size
| Feature | FLV | MP4 |
|---|---|---|
| Container | Flash Video | MPEG-4 Part 14 |
| Typical codecs | Sorenson Spark, VP6, H.264 | H.264 video, AAC audio |
| Best for | Nothing new: Flash reached end of life in 2020 | Sharing anywhere, uploads, web embeds |
| Plays on | Desktop players only, with effort | Every phone, browser, TV and editor |
| File size | Moderate, heavily dated | Small for the quality |
FLV to MP4 questions
Is the FLV to MP4 converter free?
Yes. Convert and preview the result for free, then create a free account to download it. There is no per-file charge and no watermark on the MP4 itself beyond the free-plan badge.
Do I need to install any software?
No. The conversion runs on our servers and you use it from a browser tab, so it works the same on Windows, macOS, Linux, iPhone and Android. Nothing to install at either end. Where FLV plays: Desktop players only, with effort. Where the MP4 you get back plays: Every phone, browser, TV and editor.
Does converting FLV to MP4 reduce the quality?
Converting re-encodes the video, so it is not bit-for-bit identical. We encode at a high quality target, which keeps the result visually indistinguishable from the FLV on normal viewing. What changes is the container and the codec. MP4 holds: H.264 video, AAC audio. Converting the same file back and forth repeatedly will eventually show, so keep your original.
How large a file can I convert?
Anything under 1GB per upload, which is more footage in some formats than others. FLV: Moderate, heavily dated. MP4 coming back: Small for the quality. For anything bigger, trim or compress it first, both are free tools here.
Is my file kept private?
Your upload is processed and then held only as long as your project needs it. Nothing is published, indexed or shared unless you create a share link yourself.
Other formats
Everything else you can do here.
Every conversion for a format
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Convert FLV to MP4 now
Free, nothing to install, and the file stays open in a full video editor afterwards.