Your files stay on your Mac.
Matroska (.mka) is a flexible container that wraps audio streams in a single file. Convertessa reads the audio track and writes it out as uncompressed PCM WAV — the format every DAW, editor, and audio tool accepts without a plugin. Conversion runs entirely on your Mac; nothing is uploaded.
Drag one or more .mka files — or an entire folder — onto Convertessa. The app queues every Matroska file it finds.
In the output format list, choose WAV as your target. Convertessa will write lossless, uncompressed PCM output for each file in the queue.
Click Convert. Convertessa processes every file locally and saves the .wav files alongside your originals. No upload, no wait for a server.
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 uncompressed PCM audio, so the output is a lossless representation of the audio stream inside the Matroska container. No quality is sacrificed in the process.
Yes. Drag a folder onto Convertessa and it queues every .mka file inside. From the command line, run convertessa folder/ --to wav to batch-convert in one pass.
Convertessa strips embedded metadata during conversion. The resulting .wav files contain audio data only, with no carried-over tags from the source Matroska container.