How do I convert MP3 to AIFF?

Add your MP3 file to the upload area above, then press Convert. The AIFF file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to AIFF reduce quality?

No. AIFF is a lossless format, so the conversion preserves exactly what is in your MP3 file. Note that it cannot recover detail that was already discarded when the MP3 was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 300 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

AudioLosslessRuns in your browser

MP3 to AIFF Converter

Turn MP3 files into AIFF in a couple of clicks. The universal lossy audio format. Apple's uncompressed audio counterpart to WAV. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

MP3 files (.mp3) · up to 300 MB each

or paste files from your clipboard

Ready when you are

Drop a MP3 file above and FileTools360 will turn it into AIFF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your MP3 files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control bitrate, sample rate and channels and start and end times.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

MP3 and AIFF explained

MP3 is the lossy audio format that made digital music portable. Its patents expired in 2017, which is part of why it remains ubiquitous — anyone can implement it freely.

AIFF is Apple's uncompressed audio format, functionally equivalent to WAV but with better metadata support and big-endian byte order.

Where MP3 files come from: Music libraries, podcasts and voice recordings.
Where AIFF is used: Mac audio production and older Apple software.

MP3 vs AIFF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

MP3 compared with AIFF
Property	Source	Target
Compression	Lossy	Uncompressed
Introduced	1993	1988
Browser support	Plays absolutely everywhere.	Strong on Apple, decent elsewhere.

MP3 is stronger at: Plays on absolutely everything, including old hardware. Small files. No licensing constraints since 2017.
AIFF is stronger at: Uncompressed and lossless. Better metadata handling than WAV. Standard in Mac audio workflows.

Why convert MP3 to AIFF?

People make this switch when they run into the limits of MP3: archiving masters, or editing audio you will re-export repeatedly. AIFF is the better fit when audio production on a Mac.

Be aware of the size trade-off: AIFF is uncompressed, so expect the converted file to be considerably larger than the MP3 you started with.

MP3 limitations that prompt the switch: Lossy — discarded detail cannot be recovered. Beaten on quality-per-byte by AAC and Opus. No native support for multichannel audio in practice.
What you give up: Very large files. Less universally supported than WAV.

Does converting MP3 to AIFF reduce quality?

Going from MP3 to AIFF moves already-compressed data into a format that stores it exactly. Nothing is lost from this point on, but nothing is recovered either — the detail MP3 discarded when the file was first created is gone permanently. Expect a noticeably larger file for identical visual quality.

Converting MP3 to a lossless format like FLAC does not restore quality. It produces a larger file containing exactly the same degraded audio.