Your files stay on your Mac.
Convertessa reads the audio stream embedded in your Matroska MKV and decodes it to uncompressed PCM WAV — preserving the original sample rate and channel layout. No re-encoding, no quality loss. Everything runs locally on your Mac; your files never leave the machine.
Drag one MKV file or an entire folder onto Convertessa. Batch mode processes every MKV in the folder in one pass.
Pick WAV from the output format list. Convertessa decodes the audio track to uncompressed PCM — no lossy step involved.
Click Convert. Each MKV produces a matching WAV file alongside the original. The video track is left untouched.
Images, audio, video, documents, archives and eBooks — all converted natively, right on your Mac.
Pick a format you have — see everything Convertessa can turn it into.
Convert hundreds of files at once with per-type group defaults and individual overrides.
First-class support for HEIC, AVIF and WebP — encode and decode, both ways. Read JPEG XL and a dozen more modern formats too.
Drop files anywhere on the window. Native, instant, and exactly what you’d expect on a Mac.
Dial in compression, resolution and bitrate. Keep originals pristine or shrink for sharing.
Never overwrite a file by accident. Convertessa appends safe suffixes automatically.
Every job is logged locally. Re-run a previous conversion or revisit recent outputs in a click.
Bundle your converted files straight into a single ZIP, TAR or 7z — packaged and ready to share the moment a job finishes.
Right-click any file in Finder and choose Convert. A Quick Action handles it on the spot — no need to open the app first.
Shrink Convertessa to a tidy mini window that tucks into a corner — just a drop zone and a format picker for quick, one-off conversions.
No cloud. No account. No upload. Every conversion happens entirely on-device, using the power already in your Mac. What you convert is nobody’s business but yours.
Script conversions, wire them into your build, or batch a folder from the terminal. The same engine, no GUI required.
Read the full CLI documentation →Shrink Convertessa down to a small, focused window — drop, convert, done, with your recent conversions one click away.
macOS 14+ · Apple Silicon & Intel
New formats, new features, and fixes — every release, on the record.
No. WAV stores audio as uncompressed PCM, so there is no lossy encoding step. The audio is decoded from whatever codec the MKV uses and written out at the original sample rate and bit depth.
No. Convertessa runs entirely on your Mac. Your MKV files are never sent to a server or cloud service.
Yes. Drop a folder onto Convertessa or run convertessa ./folder/ --to wav in the terminal. Every MKV inside is converted in one pass.