Add MP3 files
Select non-empty .mp3 sources up to 100 MB per file.
MP3 audio to MP4
Wrap newly encoded AAC audio in an MP4 file.
Queue qualifying MP3 audio and download fast-start, audio-only MP4 results built from the first audio stream.
- Audio-only MP4
- AAC at 160k
- 100 MB per file
Processed by our self-hosted conversion engine
Supported files
MP3 in. AAC audio MP4 out.
MP3MP4
Fileverses decodes the first MP3 audio stream and creates a fresh, fast-start MP4 containing AAC—not a video file.
How it works
Move a small MP3 queue into audio-only MP4 files
Start the queue
Each queued upload is processed one at a time by the server-side AAC MP4 profile.
Download audio MP4s
Review a completed result where supported, then save its individually named audio-only MP4.
Fixed output profile
AAC audio in MP4, with no video or source tags.
The route strips video, metadata, and chapters before AAC-at-160k encoding. It cannot restore MP3 detail or promise a fixed result size.
Convert MP3 to MP4Eligible MP3 source required
Only non-empty .mp3 files up to 100 MB are accepted, and they must be readable by host FFmpeg with audio.
First audio stream only
Fileverses maps the first audio stream and provides no alternate-track selection.
New AAC audio-only MP4
The result contains AAC at 160k in a fast-start MP4. It contains no video and is not a stream copy.
No retained source structure
Source metadata and chapters are removed. There are no trim, bitrate, sample-rate, channel, or quality controls, and size can vary.
MP3 to MP4 FAQ
Audio MP4 questions
Does this MP3 to MP4 converter create video?+−
No. It creates an audio-only MP4 containing newly encoded AAC; the profile explicitly excludes video.
Which audio codec is in the MP4?+−
The fixed profile encodes AAC at 160k and writes a fast-start MP4 from the first MP3 audio stream.
Is the MP3 stream copied into the MP4?+−
No. The audio is decoded and re-encoded as AAC, so this is not a container-only remux.
Can I convert several MP3 files?+−
Yes. Eligible MP3 uploads are queued and processed sequentially, with separate downloads for completed files.
What MP3 files can I submit?+−
Files must be non-empty .mp3 uploads of 100 MB or less that host FFmpeg can read with an audio stream.
Will the output restore quality or have a fixed size?+−
No. AAC encoding cannot restore losses already present in MP3, and the resulting size depends on the source.
Are metadata, chapters, and editing options preserved?+−
No. Metadata and chapters are removed, and the route has no trim, stream-selection, bitrate, channel, sample-rate, or quality controls.