AIFF to MP3 Converter
Upload an AIFF file and get back an MP3 encoded with libmp3lame at a fixed 192 kbps constant bitrate, with whatever title, artist and album tags the AIFF carries rewritten as ID3. One thing to check first: the page accepts the long extension .aiff, so rename a file called song.aif before you drop it in.
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Why convert AIFF to MP3
AIFF is Apple's uncompressed PCM container, the format Logic Pro, GarageBand and older iTunes rips write when you ask for full resolution. Nothing is thrown away, which is the problem once a session is finished: stereo at 44.1 kHz and 16 bits runs about 10 MB per minute, so a six-minute mix is a 60 MB file. That is too heavy for email, and plenty of Android phones, car head units and upload forms will not read .aiff at all. MP3 is read almost everywhere.
The work happens on our servers, not in your browser. ffmpeg 5.1.9 decodes the AIFF PCM stream and re-encodes it with libmp3lame, asking for a constant 192 kbps. Every picture stream is stripped during the run. There is no bitrate menu, no sample-rate menu and no VBR option, so you get the same encode every time, which is also why the page cannot produce a 320 kbps file.
What survives: title, artist and album tags are written as ID3 frames, mono stays mono, and the sample rate is kept up to 48 kHz. What changes: 88.2 and 96 kHz AIFF masters come down to 48 kHz, more than two channels are folded to stereo, and embedded cover art is dropped, so re-attach artwork in a tag editor afterwards. Bit depth stops mattering once the audio is no longer PCM, so a 24-bit and a 16-bit AIFF both come out as the same 192 kbps stream. Nothing is normalized, filtered or trimmed. Keep the AIFF as your master and treat the MP3 as the copy you hand out.
The people who land here are usually Mac users bouncing a mix or a voice recording from a DAW for a client, owners of old iTunes libraries that were ripped to AIFF, and anyone handed an .aiff file by a studio.
How to convert AIFF to MP3
- Check the extension. The converter recognizes .aiff; the short .aif spelling has no alias here and is refused in the browser as an unsupported format, so rename interview.aif to interview.aiff first.
- Tidy the tags in the file first if they matter to you. Title, artist and album are carried into the MP3's ID3 data; an embedded image will not be, so plan to add artwork afterwards.
- Drag the AIFF files onto the page. You can drop several at once, up to 10 per batch on a guest or free account, and the batch may mix in other audio sources such as WAV, FLAC or M4A.
- Start the conversion and wait. Files like these typically finish within a few seconds of the upload completing; long sessions take longer, and a single run is cut off at 30 minutes.
- Download the results. Each MP3 keeps the original base name with the new extension, and the link stays valid for about four hours before the file is deleted.
What this converter does
- libmp3lame encoding at a requested constant 192 kbps, with identical settings for every file, so a whole folder of bounces comes back consistent
- Whatever title, artist and album tags the AIFF carries are rewritten as ID3 tags in the MP3; AIFF stores metadata inconsistently, so check the output if tags matter to you
- Sample rate kept up to 48 kHz; 88.2 and 96 kHz AIFF masters are resampled to 48 kHz because MP3 stops there
- Mono files stay mono instead of being padded to stereo, which keeps spoken-word and single-mic recordings small
- Several AIFF files per batch, and mixed batches with other accepted audio sources on the same page
- Nothing to install: the conversion runs on our servers and the MP3 comes back as a direct download
AIFF to MP3 questions
Can I convert AIFF to MP3 at 320 kbps?
Not here. The encoder is fixed at a requested 192 kbps constant bitrate and the page has no quality selector, so every file comes out the same. 192 kbps is a common bitrate for distribution copies, but the encode is lossy and cannot be undone, so keep the AIFF as your master.
Why was my .aif file rejected?
The page only matches the four-letter .aiff extension, so the short spelling .aif is treated as an unknown format before the file is uploaded. Rename the file so it ends in .aiff and drop it in again; the contents do not need to change.
How much smaller will the MP3 be?
A CD-rate stereo AIFF carries about 1,411 kbps of uncompressed PCM, and the MP3 is written at 192 kbps, so the file gets a lot smaller. The exact size depends on the source sample rate, channel count and length, so check the output rather than relying on a fixed ratio.
Will the album artwork and the rest of my metadata come across?
Title, artist and album come across as ID3 tags when the AIFF actually stores them, which AIFF files do inconsistently. Embedded cover art never does: every picture stream is dropped during conversion, on this and every other audio target. Add artwork afterwards in a tag editor.
What about a large AIFF file, like a full album side or a long live set?
Per-file limits apply: 50 MB as a guest, 100 MB with a free account, 200 MB on Plus and 1 GB on Pro. Over 1 GB there is a separate paid one-off conversion for signed-in users, delivered by email.
Can I do this on a Mac or an iPhone?
Yes. The page works in Safari and Chrome on both, and on an iPhone the finished MP3 lands in the Files app or your Downloads folder.
Does the converter change the volume or clean up the recording?
No. There is no loudness normalization, no noise reduction and no trimming. The MP3 is a straight re-encode of the whole AIFF at the fixed bitrate, so a quiet recording stays quiet and a clipped one stays clipped. Fix that before exporting the AIFF.
What happens to my files after the conversion?
Uploads travel over HTTPS and are converted on our servers. The AIFF you uploaded is deleted as soon as the job finishes, and the MP3 can be downloaded for about four hours before it is deleted automatically. File names, sizes and outcomes are logged for operations, and signed-in accounts keep a conversion history row.