Convert MP4 to AAC

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

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Files auto-delete in 1 hour
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You can convert MP4 to AAC for free: upload your MP4 above and Flippy extracts the audio as AAC in your browser, no signup needed.

Turning MP4 into AAC isn't really a conversion: it's an extraction: Flippy lifts the audio track out of your MP4 and re-packs it on its own. You keep the sound and drop the pixels, swapping an MP4 that runs roughly 50–100 MB per minute at 1080p, depending on bitrate for an AAC built for streaming-grade sound at friendly file sizes.

A classic MP4 to AAC job: screen recordings and downloaded clips, bound for streaming-grade playback at friendly sizes.

Why flip MP4 to AAC

MP4 is the world's default video: the file that plays before anyone has to think about it. It was born in 2001, the MPEG standards group, built on Apple's QuickTime design, and its real weak spot is very little day to day: as a container its quality depends on the codec inside.

AAC is MP3's better-trained successor: cleaner sound from the same number of bits. Advanced Audio Coding: the default soundtrack of YouTube, iTunes and most MP4 video. That makes it the right destination when what you need is streaming-grade sound at friendly file sizes.

How to convert MP4 to AAC

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

Best settings for MP4 to AAC

Quality tip for MP4 to AAC: AAC turns transparent for most ears around 192 to 256 kbps, and it degrades more gracefully than MP3 below that. The track inside your MP4 sets the ceiling: an extraction can match it, never beat it.

MP4 vs AAC, side by side

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

Questions people ask

Will converting MP4 to AAC lose quality?

The AAC is encoded once from the exact track inside the MP4: from a typical soundtrack the difference is inaudible, but it can't sound better than what the video carried.

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

Much smaller: you're keeping the audio and dropping the video, which is most of the weight. Expect similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller.

Where will the AAC file play?

Apple everything, YouTube, Android, modern players; patchy on legacy gear. That's the usual reason people leave MP4 behind: AAC simply opens in more of the places that matter.

How long does MP4 to AAC conversion take?

It scales with length and resolution: short clips finish in seconds, long HD videos can take a few minutes. Files auto-delete within an hour after.

More ways to handle these formats

Change MP4 format AAC Converter AAC size reducer Split AAC Join AAC files Normalize AAC Change MP4 resolution Extract audio from video