Upload a AIFF file and get a MP3 back. No signup, no watermark, no limit on how many.
AIFF is Apple's uncompressed PCM format — WAV's opposite number, same audio, different byte order and a container that handles tags rather better.
Where you run into it: Logic and Pro Tools sessions, Mac recordings, older Apple software that wrote it by default.
What it costs you: As big as WAV, and outside the Mac world rather less widely accepted.
MP3 is the format that made portable music work, and thirty years on it is still the one every device, car stereo, DAW and browser will open without being asked twice.
Where you run into it: Downloads, podcast feeds, old music libraries, anything a client sends you and expects you to just play.
What it costs you: It throws audio away to get small, and at 320 kbps almost nobody can hear what went. What matters is that the discarded part never comes back.
This is the conversion that actually buys you something: AIFF holds the full signal, and MP3 trades a slice of it for a file a fraction of the size. This is where the bitrate setting matters — 320 kbps for music you care about, 192 for general listening, 128 for speech. It is a one-way trip, so keep the AIFF original if it is the only copy you have.
Yes, entirely, and there is no cap on how many files you convert. No account, no watermark, no trial.
Yes — that is the point of it. MP3 discards part of the signal to get small. At the best setting the difference is inaudible to almost everyone on almost any equipment; at 128 kbps it is audible on music and fine on speech.
Much smaller — commonly a tenth of the AIFF at 320 kbps, and less again at lower settings. That reduction is exactly what you are trading a slice of the signal for.
Not here. AIFF can be read but not written by this converter — ffmpeg decodes it happily, and encoding back to it would mean a format almost nothing plays. If you need the original AIFF, keep it rather than recreating it.
The file is uploaded to do the conversion — nothing here runs in your browser — and both your upload and the converted result are deleted the moment the file is sent back. Nothing is stored and nothing is logged beyond the request itself.