Your files stay on your Mac.
Convertessa unpacks the audio stream from your MKA container and re-encodes it to TTA (True Audio), a lossless format that retains every bit of the original audio. The output plays natively in players that require standalone audio files rather than Matroska containers. All processing happens on your Mac — no upload, no internet connection required.
Drag one MKA file or an entire folder into Convertessa. Every file is processed locally and never leaves your Mac.
Pick TTA from the output format list. Convertessa will decode the Matroska audio stream and encode it to True Audio losslessly, with no quality loss.
Click Convert. Convertessa writes TTA files to your chosen destination folder, preserving the original audio data exactly.
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. TTA is a lossless codec. Convertessa decodes the audio from the MKA container and re-encodes it to True Audio without discarding any audio data — the output is equivalent to the source.
Yes. Drop a folder onto Convertessa or run convertessa ./folder/ --to tta in the terminal. Every MKA file in the folder is converted in one pass.
No. Convertessa runs entirely on your Mac. Your audio files are never uploaded to any server — all conversion happens locally.