How to convert a .F4F file online
Three steps, all tab.
Open your file
Drop your .F4F file and every video, audio and subtitle track inside is listed with its codec, resolution, frame rate and language.
Preview
See frames from across your .F4F file before you convert, even when your browser can't play the codec inside.
Convert
Pick MP4, WEBM or MP3, or repack to MKV without re-encoding. Play the result right here, then download it.
What is a .F4F file?
Everything worth knowing about Adobe HTTP Dynamic Streaming Segment File.
An F4F file is a raw video fragment from Adobe HTTP Dynamic Streaming (HDS), a Flash-era adaptive streaming protocol that died when Adobe Flash Player was killed on 31 December 2020. You cannot play it directly in a media player. To recover the video, use FFmpeg to remux the fragment to MP4, or yt-dlp if the original stream server is still live.
Programs that open .F4F files
- Windows
- FFmpeg, yt-dlp
- macOS
- FFmpeg
- Linux
- FFmpeg, yt-dlp
| Full name | Adobe HTTP Dynamic Streaming Segment File |
|---|---|
| Developer | Adobe Systems |
| First released | 2010 (Adobe HTTP Dynamic Streaming specification, built on F4V/ISO BMFF) |
| Category | Audio & Video |
| MIME type | video/f4f |
| Signature | 61 62 73 74 ("abst" - bootstrap info box at start of F4F, or ISO BMFF ftyp/moof boxes) |
Related viewers
Other free tools to open and preview your files.
Is my .F4F file uploaded to a server?
No. Your .F4F file is converted for you. The converted file is created in memory,.
Why is conversion slower than desktop software?
Browsers give web pages a single CPU core for this kind of work and no hardware video encoder. Short clips convert in seconds; for long 4K films a desktop app like HandBrake is faster. Use Start and Length to convert just the part you need.
Which output format should I pick?
MP4 plays on every phone, TV and browser. WEBM is an open format that's great for the web. MP3 keeps only the sound. MKV (no re-encode) is instant and lossless, but only changes the container.
Can I keep all audio tracks and subtitles?
The MKV (no re-encode) option copies every track as-is. MP4 and WEBM keep the first video and audio track, which is what most players use.
Why can't some files be converted?
Files protected with DRM (for example purchased iTunes .m4p songs or some .wmv rentals) are encrypted. We can show what's inside, but nobody can convert them without the key.
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