AIFF to MP3 Converter

How to Convert AIFF to MP3 Online

1. Upload Your AIFF File: Drag and drop or click "Add Files" to select AIF or AIFF files. GarageBand exports, Logic Pro bounces, ProTools renders, and Mac CD-rips all work. Batch is supported — convert entire albums in one pass.
2. Pick MP3 Bitrate Mode: Choose constant bitrate (CBR) for predictable file size or variable bitrate (VBR) for better quality at the same average size. Common bitrates: 128 kbps (~1 MB/min, podcasts), 192 kbps (good music quality), 256 kbps (high quality), 320 kbps (best MP3 quality).
3. Set Sample Rate, Channels, and Trim: Match the source rate (typically 44.1 kHz) or downsample to 22 kHz for speech. Choose mono or stereo. Optionally trim using start time + duration in HH:MM:SS.sss format.
4. Convert and Download: Click Convert. Files convert on our servers and download individually or as a ZIP — no sign-up, no watermark.

Why Convert AIFF to MP3?

AIFF (Audio Interchange File Format) is Apple's uncompressed PCM audio format — the macOS equivalent of WAV, dating back to 1988. It's lossless and editor-friendly, but the file size is enormous: roughly 10 MB per minute of CD-quality stereo. MP3 is lossy compressed audio that's 8-15× smaller at quality indistinguishable from the source for most listeners. Common reasons to convert AIFF → MP3:

• Drastically smaller file sizes — A 4-minute AIFF song is ~40 MB. The same song as 320 kbps MP3 is ~9 MB; as 192 kbps MP3, ~5 MB. That's a 75-90% reduction with negligible audible difference at 256-320 kbps.
• Universal device playback — Every device made since the late 1990s plays MP3: cars, phones, MP3 players, smart speakers, gaming consoles, kiosks, fitness equipment, Bluetooth headphones. AIFF is mostly limited to Mac and pro audio software.
• Sharing GarageBand and Logic Pro exports — These DAWs default to AIFF on bounce. Recipients on Windows or Android often can't play the file. MP3 plays everywhere without configuration.
• Streaming and uploading to platforms — SoundCloud, Bandcamp (free tier), YouTube, podcast hosts, and email all prefer MP3 over AIFF. Many platforms even reject AIFF outright.
• Mobile storage and battery — Phones can hold roughly 10× more songs as MP3 vs AIFF. Streaming MP3 uses less network and battery than AIFF.
• Email, Discord, and messaging app limits — Discord caps free uploads at 10 MB, Gmail at 25 MB. AIFF blows past these immediately; MP3 fits comfortably.

AIFF vs MP3 — Format Comparison

MP3 Bitrate Choice

Frequently Asked Questions

Will converting AIFF to MP3 reduce audio quality?

Yes — MP3 is lossy. The encoder discards audio data that perceptual studies suggest is below the threshold of hearing. At 256-320 kbps the difference from the source AIFF is inaudible to most listeners in normal conditions. At 128 kbps you may notice subtle high-frequency softness on cymbals and reverb tails. Keep your AIFF masters as backup; deliver MP3 to listeners.

What bitrate should I pick?

For music distribution: 320 kbps CBR or V0 VBR for highest MP3 quality, or 192-256 kbps for a smaller-but-still-excellent balance. For podcasts and speech: 128 kbps CBR is plenty (the human voice's frequency range maps efficiently). For audiobooks: 96-128 kbps mono cuts size further. Match the source sample rate (usually 44.1 kHz) to avoid resampling.

Why is the MP3 so much smaller than the AIFF?

AIFF stores every PCM sample at full bit depth — 16 or 24 bits times 44,100 samples per second times 2 channels = ~1411 kbps. MP3 uses psychoacoustic modeling to keep only what your ears can detect, often at one-tenth the data rate. The compression ratio is 8-15× depending on bitrate. The reduction is real and lossy, but at 320 kbps it's effectively transparent.

Can I batch convert an entire AIFF album to MP3?

Yes — drop in all the tracks at once. They convert in parallel withon our servers and download individually or as a single ZIP. Settings can apply uniformly (typical for albums) or be tuned per-file.

Will track titles, artist names, and album art transfer?

Yes — ID3v2 metadata tags survive the conversion. Artist, title, album, year, track number, and embedded album art transfer from the AIFF metadata blocks to the MP3 ID3 tags. Some very old AIFFs without metadata produce MP3s without tags, but modern GarageBand / Logic / iTunes exports include full metadata.

Should I use CBR or VBR?

VBR (variable bitrate) uses fewer bits during simple passages (silence, single instruments) and more during complex passages (full mix, transients). The result is better quality per byte than CBR at the same average bitrate. Use VBR for music. CBR (constant bitrate) has predictable file size and is required by some streaming platforms and broadcast workflows. Use CBR for podcasts and broadcast.

Can I trim part of an AIFF and save as MP3?

Yes. Use the trim section to enter a start time and duration. Both accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Useful for pulling a single song from a long DJ mix AIFF or extracting a clip from a recording session.

What if my source is AIFC instead of AIFF?

AIFC (Audio IFF Compressed) is a variant of AIFF that adds compression types like A-law, μ-law, and ADPCM. XConvert handles both — see also AIFC to MP3 for AIFC-specific guidance. The MP3 output process is identical from your perspective.