MKV to WAV Converter

MKV to WAV — Is Uncompressed Really What You Want?

Extracting an MKV's soundtrack to WAV gives you raw PCM: no second lossy stage, nothing thrown away beyond what the source already discarded, and a file every editor and DAW on earth opens without argument. It also gives you a file that is often larger than the video it came from. The short version: pick WAV when the audio is going into an editor, a mastering chain, or a transcription tool. Pick FLAC when you want the same fidelity at roughly half the size, and MP3 or Opus when the file has to be sent somewhere. This page is the WAV path — here is how it compares before you commit.

WAV vs FLAC vs MP3 as an Extraction Target

When WAV Is the Right Choice

• The audio is heading straight into Audition, Reaper, Pro Tools, Audacity, or a video editor's timeline, where a decode step on every load is wasted effort.
• You are running speech-to-text, forensic analysis, or measurement tooling — most of it expects PCM and some of it accepts nothing else.
• You will be cutting and re-saving the file repeatedly, and want each save to cost nothing in quality.
• A piece of hardware or an older studio tool simply does not read compressed audio.

When to Extract Something Else Instead

• You want to keep the audio long-term without the bulk — FLAC holds identical samples in a much smaller file and tags properly.
• You need to email, message, or upload it — a 30-minute WAV is around 300 MB and will bounce off most attachment limits.
• The recording is longer than a few hours — see the 4 GiB ceiling below, which is a real wall rather than a guideline.
• You want it on a phone or in a car — MP3 remains the format nothing refuses.

The Five Audio Codec Options on This Page

The Audio Codec control here does not choose a compression scheme — it chooses how each sample is stored. Two of the five entries are not what most people expect from a "WAV", so read before selecting. Sizes assume stereo, except the G.711 row.

There is no bitrate, quality preset, or file-size control on this page, and that is correct rather than an omission: linear PCM has no compression to tune. Size follows directly from bit depth × sample rate × channels × duration.

How to Convert MKV to WAV

1. Upload Your MKV File: Drag your .mkv onto the page or click "Add Files" to browse. Queue several videos to extract them all with the same settings.
2. Pick the Audio Codec: Leave it on PCM 16-bit Little Endian for a standard editable WAV, or choose PCM 24-bit / PCM 32-bit Little Endian if the file is going into a mastering chain that wants the headroom.
3. Set Audio Sample Rate and Audio Channel: Both default to Original, which mirrors whatever the MKV holds. Set 44100 Hz for a CD-standard file or 48000 Hz to match video post; set Audio Channel to Stereo to force a predictable two-channel result, or Mono for voice. Trim exports a start-plus-duration slice.
4. Convert and Download: Click Convert and download the .wav. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark.

Frequently Asked Questions

Which audio track gets extracted if my MKV has several?

Not necessarily the first one — this trips people up constantly. Matroska routinely carries a 5.1 mix, a stereo downmix, a director's commentary, and several language dubs in one file. With no explicit stream mapping, ffmpeg's documented automatic selection takes "the stream with the most channels" for audio and breaks ties by lowest index, so the 5.1 mix usually wins even when the stereo track appears first in the file. If you need a particular dub or commentary, isolate that track in a Matroska editor before uploading.

Does converting to WAV improve the audio, since WAV is lossless?

No, and this is the most common misconception about the format. WAV faithfully stores whatever the decoder handed it — if the MKV's track was AAC, AC-3, DTS, or Opus, the WAV preserves those existing artefacts exactly rather than removing them. Choosing 32-bit or 96 kHz makes a bigger file, not a better one. What WAV genuinely buys you is a working master that costs nothing in quality across repeated edits and saves.

Why is the WAV bigger than the whole MKV?

Because you traded compression for simplicity. A 16-bit/44.1 kHz stereo PCM stream runs at a constant 1,411 kbps, while the lossy audio inside a typical MKV sits somewhere between 128 and 640 kbps — and the video, which you just discarded, was itself compressed dozens of times more aggressively. Dropping the picture and still ending up with a larger file is normal here. FLAC holds the same samples in roughly half the space if the size bothers you.

Is there really a 4 GiB limit, and what happens if I cross it?

Yes, and it is structural. WAV is built on RIFF, whose headers store chunk and file lengths in 32-bit fields, capping a conventional .wav at 4,294,967,296 bytes. The RF64 and Wave64 extensions exist to get past that, but our output is written as plain RIFF, so a recording long enough to exceed the cap produces a file whose header cannot describe it — some editors will still read the audio, many players will not. At the 16-bit/44.1 kHz default that ceiling is about 6.8 hours; at 32-bit it is closer to three. Split long sources before uploading.

Are A-law and mu-law really lossy, even though they are called PCM?

Yes. G.711 A-law and mu-law are companded 8-bit encodings designed for telephone networks: they squeeze a wider dynamic range into eight bits using a logarithmic curve, which discards resolution permanently. They sit under the Audio Codec list because WAV can legitimately wrap them, and they are the right pick when you are feeding a telephony or IVR system that expects G.711 at 64 kbps. For anything musical or archival they are the wrong choice — stay on the linear PCM entries.

Should I extract at 24-bit if the MKV's audio is a lossy track?

There is no fidelity reason to. Extra bit depth cannot recover detail that AAC or AC-3 already threw away, so a 24-bit extraction of a lossy track is a bigger file holding the same information. The one legitimate case is workflow: if the WAV is going into a chain that will apply gain, EQ, or heavy processing, the extra headroom keeps intermediate rounding out of the audible range. Extract at 16-bit if the file is going straight to transcription or a simple edit.

Can I just take a section instead of the whole soundtrack?

Yes, two ways. Use the Trim control on this page to set a start time and duration, which extracts only that window. Or, if the source is a large film and you want to shorten the upload itself, cut the video first with the video cutter — note that the audio cutter takes audio files rather than video, so it is the tool for trimming the WAV afterwards, not the MKV beforehand.

How are my files handled, and how long are they kept?

Your MKV is uploaded over an encrypted connection, converted on our servers, and both the upload and the extracted WAV are deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public. Since PCM output is large, upload and download time is usually the slow part rather than the conversion — if you need a compact copy afterwards, WAV to MP3 handles that in one more step.