MP3 -> M4A · Local tool
MP3 to M4A
Convert an MP3 to M4A, for Apple devices and smaller files.
Last updated
How do I convert an MP3 to M4A?
Drop the MP3 onto filetity's converter and it is re-encoded as AAC inside an M4A container, in the browser tab with nothing uploaded. This direction needs no extra engine, because every browser can already write AAC, which is the opposite of converting to MP3. Two good reasons to do it: Apple software and hardware handle M4A more comfortably, particularly for ringtones and audiobooks which want one specifically, and AAC is more efficient, so if you are re-encoding anyway the same size sounds better. It will not sound better than the MP3 did, because nothing can restore what was already discarded and this adds a second lossy encode, so convert from an original when you have one.
01 / Your device
the file stays here
02 / Browser memory
the work runs locally
03 / Back to you
saved on this device
When you would use this
Situations, not settings.
- Making an iPhone ringtone
- A ringtone wants an M4A. Trim the clip first, since there is a length limit, then convert.
- An audiobook or a podcast for Apple software
- M4A is what Apple's own tools expect, and it handles long files and chapters more comfortably than MP3 does.
- Re-encoding anyway and wanting the better codec
- AAC beats MP3 at the same size. It will not sound better than the MP3 did, because nothing restores what was already discarded.
How it works / no cloud
A conversion engine, not an upload form.
The MP3 is decoded by your browser and re-encoded as AAC inside an M4A container, using the encoder the browser already ships. No extra engine is downloaded for this direction, unlike converting to MP3, which needs one.
- Offline ready
- Installable app
- No file limit queue
Straight answers
No accordion. Nothing hidden.
- Is it free?
- Yes, with no watermark and no page limit.
- Does it need an account?
- No. There is no account system.
- Is my file processed on my device?
- Yes. The file is read by your browser and never uploaded. There is no server to send it to.
- What formats are supported?
- MP3 in. M4A out, AAC audio, at a quality you pick.
- What are the limits?
- This is a second lossy encode of audio that was already lossy, so it is worth doing for compatibility rather than for quality.
- Does it work on mobile?
- Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
- Does it work offline?
- Yes, once the page has loaded. The tool keeps working with no network connection.
- Why would I convert away from MP3?
- Two reasons. Apple software and hardware handle M4A more comfortably, particularly for ringtones and audiobooks, which want an M4A specifically. And AAC is more efficient, so if you are going to re-encode anyway, the same size sounds better. If nothing is asking for M4A, keeping the MP3 is the better call.
- Will it sound better than the MP3 did?
- No. Nothing can add back what the MP3 already discarded, and this adds a second round of lossy encoding on top. What you get is a file that is as close to the MP3 as AAC can manage, in a container Apple software prefers. Convert from an original if you have one.
- Can I make an iPhone ringtone with this?
- This gets you the M4A, which is the format an iPhone ringtone needs. Getting it onto the phone is the other half, and it involves renaming the file to .m4r and importing it, which is a step Apple keeps moving. Trim the clip first, since a ringtone has a length limit.
- Is M4A the same as MP4?
- The same container with a different extension by convention: .m4a signals audio only and .mp4 signals there is video too. Software generally treats them identically, and naming an audio-only file .m4a is what stops a media player trying to open a window for a video that is not there.
- Do the tags come across?
- No. Title, artist and artwork live in ID3 frames inside an MP3 and in a different structure inside an M4A, and what is converted here is the audio itself. A music library manager will re-tag a folder in one pass, which is less work than doing it per file anywhere.
Keep working locally
3 available · more coming