audio in, MP4 out: free, no signup, and both files delete themselves within an hour.
One file at a time for now
Batch processing isn't available yet: drop files one by one, or use the Merger to join them.
Try another fileFlippy turns audio into MP4 for free: upload the audio above and download it wrapped as MP4, sound untouched. No signup, and both files delete themselves within an hour.
It sounds backwards, but audio to MP4 is a real need: plenty of platforms and tools only accept video, so Flippy re-packs your audio audio inside an MP4 wrapper. Where MP4 accepts your audio's codec the sound crosses over untouched; where it doesn't, it's re-encoded once. The MP4 that comes out is built for playing everywhere: browsers, phones, TVs, editors, slide decks.
A classic audio to MP4 job: voice memos, downloads and session exports, bound for feeds, chats and slide decks that expect video.
Whatever the recording, audio just wants to be heard: the trick is picking a shape that plays where you need it. It comes from wherever your camera, screen recorder or download made it.
MP4 is the world's default video: the file that plays before anyone has to think about it. A container, most often carrying H.264 or H.265 video with AAC audio. That makes it the right destination when what you need is playing everywhere: browsers, phones, TVs, editors, slide decks.
Drop your audio file into the flipper above, or click to browse for it.
Check the output format: MP4 is already selected for you.
Hit Convert, give it a moment, then download your new MP4.
Settings for audio to MP4: none to pick. Where the MP4 container accepts your audio's audio codec, the stream is copied bit for bit; where it doesn't, Flippy re-encodes it once and leaves the levels alone.
| audio | MP4 | |
|---|---|---|
| Born | wherever your microphone, DAW or download came from | 2001, the MPEG standards group, built on Apple's QuickTime design |
| Type | audio · any format | video · container |
| Best for | any sound file: music, voice memos, podcasts, session exports | playing everywhere: browsers, phones, TVs, editors, slide decks |
| Weak spot | nothing in particular; the limits belong to whichever format it happens to be wearing | very little day to day: as a container its quality depends on the codec inside |
| Typical size | anywhere from tiny voice notes to studio-sized masters | for video content, roughly 50–100 MB per minute at 1080p, depending on bitrate; wrapping audio alone stays about the size of the audio |
| Plays on | Depends entirely on the format it lands in. | Every browser, phone, TV and editing app worth mentioning. |
No. Wrapping audio in an MP4 container doesn't touch the sound itself: it's the same stream in a different box.
About the same, plus a sliver of container overhead. The audio stream is unchanged; MP4 just adds a video-shaped envelope.
Every browser, phone, TV and editing app worth mentioning. That's the usual reason people leave audio behind: MP4 simply opens in more of the places that matter.
Seconds for most audio files: there are no pictures to encode, so wrapping the audio as MP4 is nearly as fast as copying it. Both files auto-delete within an hour.