MP3 to AIFF Converter

MP3 to AIFF — Which Should You Use, and Will Converting Help?

If you are importing an MP3 into Logic Pro, GarageBand, or another macOS audio app, you may want AIFF — the uncompressed PCM format Apple introduced in 1988 as its big-endian counterpart to WAV. The honest catch up front: decoding an MP3 to AIFF gives you a large, edit-friendly uncompressed file, but it does not restore the detail MP3 compression already discarded. Convert when you need AIFF for editing or DAW import; if you only want a smaller, shareable file, stay on MP3.

Side-by-side Comparison

When to Pick MP3

• You are sharing or streaming the file and small size matters more than headroom.
• The destination is a phone, web player, or messaging app — MP3 plays nearly everywhere.
• You need rich tags: ID3 carries cover art, lyrics, and track info that AIFF stores only sparsely.
• The audio is already an MP3 and you are not editing it — re-saving to AIFF just inflates the size.

When to Pick AIFF

• You are importing into Logic Pro, GarageBand, Pro Tools, or Final Cut on macOS, where uncompressed PCM is the native, scrub-friendly format.
• You will edit, trim, or apply effects repeatedly — working in PCM avoids stacking generation loss from re-encoding a lossy file each save.
• You want a deterministic, codec-free master that any editor opens without an MP3 decoder.
• Your workflow or hardware specifically expects .aiff/.aif rather than .wav.

AIFF Output Size at a Glance (16-bit PCM)

Because this converter writes uncompressed 16-bit big-endian PCM, the output size is deterministic — it depends only on sample rate, channel count, and duration, not on the source MP3's bitrate. The two controls that move it are Audio Channel (mono halves the size) and Audio Sample Rate.

How to Convert MP3 to AIFF

1. Upload Your MP3 File: Drag and drop your MP3 onto the page or click "Add Files." You can queue several MP3s and convert them with the same settings.
2. Set Audio Channel and Sample Rate: Leave both on "Original" to keep the source layout, or force Mono/Stereo and pick a sample rate (for example 44.1 kHz) if your DAW session needs a specific rate.
3. Trim if Needed: Use the Trim control to clip the AIFF to just the section you want before exporting — handy for grabbing a loop or removing silence.
4. Convert and Download: Click Convert and save your AIFF. No sign-up, no watermark. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours.

Frequently Asked Questions

Will converting my MP3 to AIFF improve the sound quality?

No. MP3 is lossy, so the encoder permanently discarded audio data that an AIFF cannot reconstruct. The AIFF will sound the same as the source MP3, just in an uncompressed wrapper. The benefit is editability and avoiding further generation loss, not recovered fidelity.

Why is my AIFF file roughly ten times larger than the MP3?

Because AIFF stores raw, uncompressed PCM samples while MP3 throws most of that data away. Uncompressed stereo at 44.1 kHz / 16-bit runs about 10 MB per minute, whereas a 128 kbps MP3 is closer to 1 MB per minute. The size jump is expected — it is the storage cost of an uncompressed format, not added quality.

Is AIFF or WAV better for importing MP3s into a Mac DAW?

Both are uncompressed PCM and sound identical; the real difference is byte order and ecosystem. AIFF is big-endian and Apple-native, so it feels at home in Logic Pro and GarageBand, while WAV is little-endian and slightly more universal across Windows tools. On macOS, AIFF is the safer default. If you need WAV instead, use our MP3 to WAV converter.

What sample rate and bit depth does the AIFF use?

This converter writes 16-bit big-endian PCM — the AIFF-standard PCM_S16BE codec that matches CD-quality audio and opens in every Mac audio app. Bit depth is fixed at 16-bit here; going higher would not recover any detail an MP3 already discarded, so there is nothing to gain from a 24-bit wrapper for a lossy source. The setting you do control is Audio Sample Rate: leave it on Original to keep the MP3's rate (usually 44.1 kHz), or set 48 kHz to match a video or DAW session so the engine does not resample on import.

Does the AIFF keep my MP3's cover art and ID3 tags?

Largely no. ID3 (artwork, lyrics, album fields) is an MP3 feature; AIFF supports only basic Name, Author, and Annotation text chunks, and not every player reads them. Treat the AIFF as a working audio file and keep the tagged MP3 if you need the metadata for a library.

Can I convert several MP3s to AIFF at once, and how large can they be?

Yes — queue multiple MP3s and they convert with the same channel, sample-rate, and trim settings. In our testing, a typical 3-minute 320 kbps MP3 decodes to an AIFF in the low tens of megabytes; the practical limit on the way in is upload size and time, not your device. For oversized batches or to compress the result afterward, see the Audio Compressor.

Should I edit the AIFF and then go back to MP3?

That is a common and sensible workflow: convert to AIFF, do your trimming and effects in PCM to avoid re-encoding loss at each save, then export a fresh MP3 only at the end. When you are ready to shrink it back down, use our AIFF to MP3 converter.

What is the difference between .aiff, .aif, and .aifc?

.aiff and .aif are the same uncompressed PCM format — .aif is just the old three-letter extension that DOS and older Windows required, while .aiff is the full name, and either opens identically. .aifc (AIFF-C) is a compressed variant of the container that can wrap codecs such as mu-law or IMA ADPCM inside the AIFF wrapper. This converter outputs standard uncompressed .aiff, which is what Logic Pro, GarageBand, and Pro Tools expect for a working master.