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AIFF to WAV.
Lossless and instant. Only do it when something refuses to read AIFF. Almost everything reads both, but not quite everything — a few older samplers, some Windows editors and the occasional plugin want a WAV specifically. The conversion is exact, so there is no reason to hesitate when you hit one.
Drop tracks to convert
WAV, AIFF, FLAC, MP3 or M4A. Drop a whole folder’s worth — one set of settings is applied to all of them and they come back as a single archive. Nothing is uploaded; the page makes no network request.
What it costs
Nothing is lost here.
The part every other converter leaves out, because it is the part that sometimes says don't.
Nothing to the audio, and the file is the same size. What you lose is tagging: WAV holds metadata badly, so expect artist and title to be less reliable afterwards.
The one thing WAV is bad at is metadata. Its tagging was bolted on late and support is patchy, so artist and title can survive a trip through one program and vanish in the next. AIFF holds the same audio and tags properly, which is why it is the better lossless choice for a library.
The four that matter
What each format is for
Ogg and Opus are missing on purpose: no CDJ reads either, so neither belongs in a DJ's library.
| Format | Size, roughly | What it is for |
|---|---|---|
| WAV | 10 MB a minute | Uncompressed and universal. Opens in everything ever written. Poor at holding tags, which is the one reason to prefer AIFF. |
| AIFF | 10 MB a minute | The same audio as WAV in a container that tags properly. What Rekordbox is happiest with and what every CDJ in service reads. |
| FLAC | About two-thirds of WAV | Lossless compression — identical samples, a third less disk, and a checksum so the file can prove it years later. Read by Rekordbox and the CDJ-3000, but not by the CDJ-2000NXS2. |
| MP3 | About 2.4 MB a minute at 320 | Lossy, permanent, and universal. The right last step for a stick and the wrong middle step in any chain. |
The rule underneath all of it: lossless to lossless costs nothing and can be undone, lossless to lossy costs audio you cannot get back, and lossy to lossless costs disk and recovers nothing. Only the middle one is a real decision.
Frequently asked
Common questions
Is AIFF to WAV lossless?+
Yes, exactly. Both formats store uncompressed samples and the only real difference is byte order inside the file. Converting between them is repackaging and can be repeated as often as you like without changing anything.
Which is better for DJing?+
AIFF, on tags alone — the audio is identical, so the tiebreaker is which container looks after your artist and title, and that is AIFF. Convert to WAV when a specific piece of software makes you, not as a default.
Will the file get bigger?+
No. Both are uncompressed at the same depth and rate, so the sizes match to within a few hundred bytes of header. If your output is much larger than the input, something changed the bit depth — check the setting before you convert a whole folder.
Do my files get uploaded anywhere?+
No, and that is the main reason to use this rather than a site that asks you to wait for an upload. The AIFF is decoded, re-written as WAV and handed back entirely inside this browser tab — open the network panel and watch it stay empty. There is no server behind the page, which means an unreleased promo is safe to drop on it and nothing is sitting in somebody's bucket afterwards.
Can I convert a whole folder at once?+
Yes. Drop as many files as you like, set the format once, and the whole queue is converted with a report for each file — what it came from, what it went to, and how the size compares. The results come back as a single archive rather than as thirty separate downloads, which is what you want when the next step is dragging a folder into Rekordbox.
Do the tags come across?+
Yes. Artist, title, album, album artist, genre, year, track number, label, remixer, composer, BPM, key, ISRC, comment and the cover art are all read off the AIFF and written into the WAV, so a converted folder arrives in Rekordbox named rather than as a wall of filenames. The one thing that does not travel is anything a DJ program keeps in its own private frames — Serato's cue points and beat grid live in an undocumented block that nothing outside Serato reads, and no converter can carry them.
Is there a file size limit?+
Up to 800 MB per file, which is about 75 minutes of 24-bit stereo audio — a full recorded set fits comfortably. Past that it is the browser's own decoder that gives up rather than the tool.
How does this tool make its FLAC and MP3 files?+
The lossless formats are written here, and verified: every test file was decoded again by an independent decoder and compared sample by sample against the original, with zero differences. On real records the FLAC comes out at about 67% of the uncompressed size, which sits between the standard encoder's default setting and its slowest one. MP3 uses the reference encoder that has been the answer to that problem for twenty-five years, because a homemade one would not make bigger files, it would make worse-sounding ones.
Other conversions
AIFF to MP3 · AIFF to FLAC · FLAC to WAV · M4A to WAV · MP3 to WAV · Every direction
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