MP3 to AIFF
Convert MP3 audio to Apple's AIFF format right in your browser, nothing uploaded.
Drag & drop your MP3 files here, or click to choose. Everything runs in your browser — nothing is uploaded.
AIFF is Apple's uncompressed PCM audio format, the Mac counterpart to WAV, and it is the format Logic Pro, older Mac audio applications and many hardware samplers expect. People convert MP3 to AIFF when a Mac-based workflow, template or delivery spec asks for uncompressed audio rather than a compressed MP3. Be clear about one thing, though: MP3 is already lossy, so turning it into AIFF cannot restore or improve the sound that MP3 threw away. It simply wraps the current audio in an uncompressed, edit-friendly container and stops any further loss, which makes the file much larger. This converter runs entirely inside your browser on a WebAssembly build of FFmpeg, so nothing is ever uploaded. Drop in several MP3s at once, preview each AIFF, and download. Free, no signup, no watermark.
Frequently Asked Questions
How do I convert MP3 to AIFF?
Drag and drop your MP3 files onto the drop area, or click it to choose them from your device, and conversion to AIFF starts automatically the instant the files are added, running one file after another with no button to press and no output format to pick. Each finished file appears as a row showing its new AIFF filename, its size, an inline preview player and a Download button. Everything runs in your browser through a WebAssembly build of FFmpeg, so your audio is never uploaded.
Does converting MP3 to AIFF improve the audio quality?
No, and this is the key thing to understand: MP3 is a lossy format that has already permanently discarded some audio data, so converting it to AIFF cannot bring any of that detail back or make the recording sound better than the MP3 already does. What AIFF does give you is an uncompressed, edit-friendly copy that stops any further quality loss during editing and re-saving. Because AIFF is lossless PCM, there is no bitrate to set, so the audio is preserved exactly as it stands.
Is this MP3 to AIFF converter free and private?
Yes, it is completely free with no signup, no account and no watermark, and it is genuinely private because the whole conversion happens inside your own browser using a WebAssembly build of FFmpeg, which means your MP3 files are never uploaded to any server or seen by anyone. There is nothing to install either. The FFmpeg engine downloads once, about 32 MB, the first time you convert, then your browser caches it so later conversions start instantly.
Why would I convert MP3 to AIFF?
Convert MP3 to AIFF when a Mac-based tool or delivery spec specifically asks for uncompressed audio: AIFF is Apple's PCM format and the native expectation in Logic Pro, older Mac audio software and some hardware samplers, even though it holds the same audio your MP3 already contains. It also gives you an uncompressed working file that will not lose more quality each time you edit and re-save it. If your software happily accepts MP3, there is no sonic reason to convert, so do it only when a template or spec requires AIFF.
Will the AIFF file be much bigger than my MP3?
Yes, expect the AIFF to be several times larger than the MP3, because MP3 is a compressed format while AIFF stores every audio sample uncompressed at roughly 10 MB per minute of CD-quality stereo, which is the same data rate that a WAV file uses. That extra size buys you an uncompressed, edit-ready file rather than better sound. If you need lossless audio in a much smaller file, convert to FLAC instead, which is also lossless but sits at roughly 50 to 60 percent of AIFF's size.
Is there a file size limit for MP3 files?
There is no size limit imposed by the site, because your files never leave your device, so the only real ceiling is how much memory your browser and computer can spare while building the much larger uncompressed AIFF output in memory. Because AIFF files are large, a long recording can run to hundreds of megabytes. Files over roughly a few hundred MB can be slow or run out of memory on a phone, so for long tracks a desktop browser is the safer choice.
Does this work on Mac, iPhone and Android?
Yes, the converter works in any modern browser on Windows, Mac, Linux, iPhone and Android, because all of the work is done by WebAssembly on your own device rather than on a server, so there is nothing to install and no app to download on any platform. Phones have far less memory than desktops, and AIFF output is large, so very long or heavy files can be slow or fail on mobile. For big batches or long recordings, a Mac or PC browser is the more reliable option.