MKV to AIFF Converter

MKV to AIFF — What This Conversion Actually Does

This tool extracts the audio from an MKV (Matroska) video and writes it to an AIFF audio file — the video and subtitles are discarded, you keep only the sound. The important honest detail is what's inside your MKV: most MKV files carry a lossy audio track (AAC, AC-3, DTS, or Opus), and unpacking lossy audio to uncompressed AIFF does not restore any lost detail — you get a much larger file of the exact same sound. If your MKV holds a FLAC or PCM track, this is a true lossless unpack. Either way, the real reason to do it is workflow: AIFF is the uncompressed PCM format that Logic Pro, GarageBand, older DAWs, and hardware samplers import natively.

MKV vs AIFF — Side-by-side

When to Convert MKV to AIFF

• You want the soundtrack, dialogue, or a music track inside a DAW as uncompressed PCM — Logic Pro, GarageBand, Pro Tools, and similar tools read AIFF directly without a transcode-on-import step.
• You're feeding a hardware sampler or older audio tool that accepts AIFF/WAV but cannot read AAC-or-DTS-in-Matroska.
• Your MKV carries a FLAC or PCM track and you want a maximum-compatibility uncompressed master with no decode step at playback.
• You'll edit the audio repeatedly and want a stable PCM working file, so cuts and fades don't trigger further lossy re-encoding.

When to Pick Something Else

• You only care about storage, transfer, or listening — unpacking a lossy MKV track to AIFF inflates the file with zero quality benefit. Extract to a small lossy file with MKV to MP3 instead.
• Your MKV holds a FLAC/PCM track and you want lossless but compact — MKV to FLAC keeps it bit-perfect at roughly half an AIFF's size.
• You need the same uncompressed audio in the cross-platform container — WAV is AIFF's little-endian equivalent and sounds identical; you can re-pack later with AIFF to WAV.
• You actually want to keep the video — this tool throws it away; convert the whole file with a video tool instead.

How to Convert MKV to AIFF

1. Upload Your MKV File: Drag and drop your .mkv files onto the page or click "+ Add Files". You can queue several and convert them with the same settings.
2. Set Audio Channel and Audio Sample Rate: Leave Audio Channel and Audio Sample Rate on "Original" for a 1:1 copy of the decoded source, or change them only if a target device needs mono or a specific rate.
3. Trim (Optional): Use the Trim control to keep just a section of the audio — useful for pulling one scene or song; leave it "Unchanged" to extract the whole track.
4. Convert and Download: Click "Convert" and download your AIFF. No sign-up, no watermark.

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — never shared or made public.

Frequently Asked Questions

Does converting MKV to AIFF improve the audio quality?

Only if the MKV's audio track is already lossless (FLAC or PCM), in which case the AIFF holds the same bit-perfect samples. For the far more common case — a lossy AAC, AC-3, DTS, or Opus track — the answer is no. The original lossy encoder permanently discarded detail to shrink the file, and decoding it to uncompressed AIFF cannot bring any of that back. The AIFF will sound identical to the source track, just much larger. Any tool promising a fidelity boost from a lossy source is mistaken.

Which audio track gets extracted if my MKV has several?

Matroska files can carry multiple audio tracks — for example separate language dubs or a commentary track. This converter extracts the file's default/first audio track and does not currently expose a track selector in its options. If you specifically need a non-default track (say, the second language), the reliable route is to demux the desired stream first with a Matroska tool such as MKVToolNix, then convert that single track here.

Why is my AIFF so much bigger than the MKV's audio?

Because AIFF stores every sample uncompressed while the MKV's track was compressed. CD-quality AIFF (16-bit, 44.1 kHz, stereo) runs around 10 MB per minute, so a 4-minute song lands near 40 MB no matter how small the compressed source was. A 192 kbps AAC track of that same song might be only 6 MB, so expect a several-fold jump. The extra bytes are uncompressed padding, not added detail.

Should I convert to AIFF or FLAC when extracting from MKV?

It depends on what you'll do with it. Choose AIFF when you want an uncompressed working file for a DAW or sampler that reads it natively and you don't mind the size. Choose FLAC when you want the same bit-perfect data but compressed to roughly half the size for storage. Note that if the MKV's track is lossy, neither one recovers quality — FLAC just stores the decoded lossy audio more compactly than AIFF does.

What's the difference between AIFF and WAV for this extraction?

They're close cousins: both are uncompressed PCM containers and sound identical. AIFF is big-endian and based on Electronic Arts' IFF format; WAV is little-endian and based on RIFF. AIFF is the more natural fit on macOS and in Apple's apps, while WAV is the cross-platform default. If you'd rather have WAV, extract to AIFF and re-pack with AIFF to WAV, which sounds the same.

What bit depth and sample rate will the AIFF have?

In our testing, leaving Audio Channel and Audio Sample Rate on "Original" produces an AIFF that matches the decoded source — commonly 16-bit PCM at 44.1 or 48 kHz for a typical movie track. The converter does not upsample, so a 48 kHz source yields a 48 kHz AIFF, not a higher-resolution one. If a sampler or DAW needs a specific rate, set Audio Sample Rate explicitly before converting rather than expecting the tool to guess.

Can I keep the video if I change my mind?

No — this tool is audio-only by design and discards the video and subtitle tracks entirely. If you want to keep the picture, use a video conversion instead of this audio extractor. To pull only a short slice of the soundtrack, use the Trim control on this page so you extract just the portion you need rather than the full-length track.