FLV to MPEG4 Converter
Processing entirely on your device — large files may take a moment.
Convert MPEG4 files exactly like MPG — to MP4/H.264. If your files are still in FLV format, this page is the shortcut: FLV is the Flash-era video container from thousands of old video sites and screen recordings. Modern players have dropped it.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How FLV compares to MPEG4
| FLV | MPEG4 | |
|---|---|---|
| Compression | VP6 / H.264 legacy | MPEG-1 / MPEG-2 |
| Quality | Of its era | Standard definition |
| Compatibility | Legacy players only | Universal decode |
| Best for | Early web video archives | Legacy disc and capture video |
How to convert FLV to MPEG4
- 1
Select your files
Drag & drop your FLV files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to MPEG4". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted MPEG4 file individually, or grab everything at once as a ZIP archive.
About the FLV format
FLV (Flash Video) was the video format of the early streaming web — YouTube's original delivery container from 2005 to ~2010, played by Adobe Flash Player. Later versions carried H.264/AAC, but the container lived and died with Flash, which reached end-of-life in 2020.
Modern browsers cannot play FLV at all, and only niche players (VLC) bother. If you have an FLV archive, converting to MP4 recovers the same H.264 video into a container every device accepts.
+Strengths
- ✓Only relevant for early-web video archives
!Limitations
- −Dead ecosystem — Flash ended in 2020
- −No browser support at all
About the MPEG4 format
MPG (MPEG program stream) usually means MPEG-1 or MPEG-2 video — the codecs of VCD, SVCD and DVD, and of countless home video captures in the 1990s and 2000s. MPEG-1 tops out around VHS-grade 352×288; MPEG-2 delivers proper standard definition and still runs inside broadcast and DVD infrastructure.
Playback compatibility is its superpower: MPEG-1/2 decode paths exist in every player and hardware made this century. Quality-to-bitrate efficiency, however, is a generation behind H.264 — converting old MPG files to MP4 typically halves their size.
+Strengths
- ✓Decodes on essentially every player and device
- ✓Simple, battle-tested standard
!Limitations
- −Inefficient codecs by modern standards
- −MPEG-1 is VHS-grade at best
Why convert FLV to MPEG4?
Converting makes sense where the strengths of MPEG4 meet what FLV cannot give you. Decodes on essentially every player and device Meanwhile Dead ecosystem — Flash ended in 2020 One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this FLV to MPEG4 converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for FLV to MPEG4?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Will the audio track be kept?
Yes. The audio is carried over and re-encoded to the standard audio codec of MPEG4, staying in sync with the video. If your FLV file has multiple audio tracks, the first one is used.
Why is video conversion slower than image conversion?
Every frame has to be decoded and re-encoded. This site runs that work on your own CPU via WebAssembly — nothing is uploaded, but a multi-minute video reasonably takes a few minutes. Images, by comparison, are single-frame jobs.