H.264 to FLV Converter
Processing entirely on your device — large files may take a moment.
Rescuing FLV recordings means converting them to MP4 before Flash compatibility disappears completely. If your files are still in H.264 format, this page is the shortcut: H.264 (AVC) raw bitstream is the elementary video stream with no container around it — what surveillance cameras, some editors and FFmpeg tutorials hand you directly. Wrap it into MP4/MKV for players to accept 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 H.264 compares to FLV
| H.264 | FLV | |
|---|---|---|
| Compression | H.264/AVC (lossy) | VP6 / H.264 legacy |
| Best for | Pipeline exchange, remuxing into MP4 | Early web video archives |
How to convert H.264 to FLV
- 1
Select your files
Drag & drop your H.264 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 FLV". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted FLV file individually, or grab everything at once as a ZIP archive.
About the H.264 format
H.264 (also called AVC) is the video codec the entire internet settled on: Blu-ray, YouTube, broadcast TV, every phone camera. A .h264 file is that codec's raw bitstream with no container — no timestamps, no audio, no metadata, just compressed frames back to back. Cameras and capture pipelines emit it because it is the codec's native shape.
Players struggle with raw streams precisely because there is no container to carry timing information. Wrapping H.264 into MP4 or MKV adds timestamps, duration and (optionally) audio tracks — the picture itself is untouched, since remuxing copies the compressed frames as-is.
+Strengths
- ✓The universal codec — plays everywhere once wrapped
- ✓Native output of cameras and capture cards
- ✓Remuxing is lossless (stream copy)
!Limitations
- −No container: no timestamps, no audio, no duration
- −Most players refuse or mis-time raw streams
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
Why convert H.264 to FLV?
Converting makes sense where the strengths of FLV meet what H.264 cannot give you. Only relevant for early-web video archives Meanwhile No container: no timestamps, no audio, no duration One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this H.264 to FLV 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 H.264 to FLV?
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.
Does converting H.264 to FLV re-encode my video?
Yes. The video is decoded and re-encoded with the settings chosen by the quality slider, which is what allows the format and size to change. For an archival copy, keep higher quality; for sharing, lower quality gives a much smaller file.
Will the audio track be kept?
Yes. The audio is carried over and re-encoded to the standard audio codec of FLV, staying in sync with the video. If your H.264 file has multiple audio tracks, the first one is used.