Convert MP3 to MP4

MP3 in, MP4 out: free, no signup, and both files delete themselves within an hour.

Drop your file here to upload

Free, no signup
No watermark, ever
Files auto-delete in 1 hour
Nothing to install

Flippy turns MP3 into MP4 for free: upload the MP3 above and download it wrapped as MP4, sound untouched. No signup, and both files delete themselves within an hour.

It sounds backwards, but MP3 to MP4 is a real need: plenty of platforms and tools only accept video, so Flippy re-packs your MP3 audio inside an MP4 wrapper. Where MP4 accepts your MP3'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 MP3 to MP4 job: voice memos, podcast episodes and music downloads, bound for feeds, chats and slide decks that expect video.

Why flip MP3 to MP4

MP3 is the format that taught music to travel: small, scrappy, and welcome absolutely everywhere. It was born in 1993, Fraunhofer Institute, Germany, and its real weak spot is holding fine detail at low bitrates: it stays small by quietly discarding sound.

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 MP3 to MP4

1
Drop your MP3 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 MP3 to MP4

Settings for MP3 to MP4: none to pick. Where the MP4 container accepts your MP3's audio codec, the stream is copied bit for bit; where it doesn't, Flippy re-encodes it once and leaves the levels alone.

MP3 vs MP4, side by side

	MP3	MP4
Born	1993, Fraunhofer Institute, Germany	2001, the MPEG standards group, built on Apple's QuickTime design
Type	audio · lossy	video · container
Best for	playing on anything with a speaker, from new phones to twenty-year-old car stereos	playing everywhere: browsers, phones, TVs, editors, slide decks
Weak spot	holding fine detail at low bitrates: it stays small by quietly discarding sound	very little day to day: as a container its quality depends on the codec inside
Typical size	about 1 MB per minute at 128 kbps: roughly a tenth of CD audio	for video content, roughly 50–100 MB per minute at 1080p, depending on bitrate; wrapping audio alone stays about the size of the MP3
Plays on	Everything. Phones, browsers, cars, smart speakers, ancient iPods.	Every browser, phone, TV and editing app worth mentioning.

Questions people ask

Will converting MP3 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 MP3?

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 MP3 behind: MP4 simply opens in more of the places that matter.

How long does MP3 to MP4 conversion take?

Seconds for most MP3 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

MP3 conversion Convert MP4 Reduce MP4 file size Split MP4 MP4 sound remover Grab a frame from MP4 Normalize MP3