Your files stay on your Mac.
WAV stores audio as raw, uncompressed PCM — great for editing, bulky for storage and sharing. Converting to Matroska (MKA) wraps your audio in a modern container with lossy compression, letting you set quality to balance file size against fidelity. The entire conversion runs locally on your Mac; your files are never uploaded.
Drag one WAV file or a whole folder into Convertessa. Batch mode reads every WAV in the folder and queues them in a single pass.
Choose Matroska from the output list. Set quality to dial in the trade-off between file size and audio fidelity.
Hit Convert. Convertessa encodes each WAV into the Matroska container and writes the MKA files alongside your originals, which are 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.
WAV holds raw, uncompressed audio samples, which is why the files are large. Matroska uses lossy compression — the quality setting you choose in Convertessa controls how aggressively the audio is compressed.
No. Convertessa runs entirely offline. Your WAV files are read and written on your Mac; nothing is sent to any server.
Yes. Drop the folder onto Convertessa or run convertessa /path/to/folder --to mka in the terminal to batch-convert every WAV file it contains.