Convert AAC to MP4

AAC in, MP4 out: free, no signup, and both files delete themselves within an hour.

Drop your file here to upload

Free, no signup
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Files auto-delete in 1 hour
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Flippy turns AAC into MP4 for free: upload the AAC above and download it wrapped as MP4, sound untouched. No signup, and both files delete themselves within an hour.

It sounds backwards, but AAC to MP4 is a real need: plenty of platforms and tools only accept video, so Flippy re-packs your AAC audio inside an MP4 wrapper. Where MP4 accepts your AAC'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 AAC to MP4 job: iTunes-era rips and app exports, bound for feeds, chats and slide decks that expect video.

Why flip AAC to MP4

AAC is MP3's better-trained successor: cleaner sound from the same number of bits. It was born in 1997, an MPEG all-star team: Fraunhofer, Dolby, Sony, AT&T and Nokia, and its real weak spot is older or stubborn hardware that only ever learned MP3.

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.

How to convert AAC to MP4

1
Drop your AAC file into the flipper above, or click to browse for it.
2
Check the output format: MP4 is already selected for you.
3
Hit Convert, give it a moment, then download your new MP4.

Best settings for AAC to MP4

Settings for AAC to MP4: none to pick. Where the MP4 container accepts your AAC's audio codec, the stream is copied bit for bit; where it doesn't, Flippy re-encodes it once and leaves the levels alone.

AAC vs MP4, side by side

	AAC	MP4
Born	1997, an MPEG all-star team: Fraunhofer, Dolby, Sony, AT&T and Nokia	2001, the MPEG standards group, built on Apple's QuickTime design
Type	audio · lossy	video · container
Best for	streaming-grade sound at friendly file sizes	playing everywhere: browsers, phones, TVs, editors, slide decks
Weak spot	older or stubborn hardware that only ever learned MP3	very little day to day: as a container its quality depends on the codec inside
Typical size	similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller	for video content, roughly 50–100 MB per minute at 1080p, depending on bitrate; wrapping audio alone stays about the size of the AAC
Plays on	Apple everything, YouTube, Android, modern players; patchy on legacy gear.	Every browser, phone, TV and editing app worth mentioning.

Questions people ask

Will converting AAC to MP4 lose quality?

No. Wrapping audio in an MP4 container doesn't touch the sound itself: it's the same stream in a different box.

Will the MP4 file be bigger or smaller than my AAC?

About the same, plus a sliver of container overhead. The audio stream is unchanged; MP4 just adds a video-shaped envelope.

Where will the MP4 file play?

Every browser, phone, TV and editing app worth mentioning. That's the usual reason people leave AAC behind: MP4 simply opens in more of the places that matter.

How long does AAC to MP4 conversion take?

Seconds for most AAC 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.

More ways to handle these formats

AAC Converter Change MP4 format Reduce MP4 file size MP4 Cutter Remove sound from MP4 Extract a frame from MP4 AAC volume booster