WAV to MKV

To convert WAV to MKV, pick your bitrate from the Bitrate dropdown (96k, 128k, 192k recommended, 256k, or 320k), then drag and drop your WAV files onto the drop area or click it to choose them. Conversion to MKV starts automatically, and each finished file appears in a row with a Download button. Set the bitrate before adding files, since it is read at the moment each file is converted. You can add several WAV files at once and they are processed one after another, entirely in your browser using a WebAssembly build of FFmpeg, so nothing is uploaded. Every finished row also shows the new filename, its size, and an inline preview player so you can listen before downloading.

Yes, some quality is lost. WAV is uncompressed lossless PCM, while the audio track written into the MKV is encoded with a lossy codec at the bitrate you select, so some data is discarded permanently and cannot be recovered by converting back to WAV later. Picking 256 or 320 kbps makes the difference much harder to hear. The upside is that the MKV will be far smaller than the original WAV.

People convert WAV to MKV when a tool or pipeline expects a Matroska container rather than a raw WAV file, and because the compressed audio inside an MKV is dramatically smaller than uncompressed PCM. MKV is an open container format, so an audio-only MKV is simply your audio track wrapped in Matroska. If you only need a smaller file and universal playback, MP3 or AAC is usually the more compatible choice.

It is completely free and completely private. There is no signup, no account, no watermark and nothing to install, and because the conversion happens inside your own browser with WebAssembly, your WAV files are never uploaded to any server. That makes it safe for confidential recordings such as interviews, client work or unreleased music, since the audio never leaves your device.

There is no size limit imposed by this site, because nothing is uploaded — the only real limit is your own device's memory. That matters with WAV in particular, since uncompressed audio runs to roughly 10 MB per minute for CD-quality stereo and long recordings get big fast. Files beyond a few hundred megabytes can be slow or run out of memory on a phone, so use a desktop browser for long sessions.

192 kbps is the default and a good balance of quality and size for most music and voice. Go up to 256 or 320 kbps when you want the result to stay as close as possible to the original WAV, and drop to 96 or 128 kbps for speech, podcasts or when file size matters more than fidelity. Higher bitrates mean bigger files but a smaller audible gap from the source.

Yes, it works in any modern browser on Windows, Mac, Linux, iPhone and Android — there is no app to install and no desktop software needed. The first conversion downloads the converter itself, a one-time file of about 32 MB, which your browser then caches so later conversions start instantly. On phones, stick to shorter WAV files, since large uncompressed recordings can exhaust mobile memory.