Your files stay on your Mac.
Convertessa reads your .mka Matroska audio files and rewrites them as Ogg Vorbis — an open, broadly supported lossy audio format. The conversion happens entirely on your Mac; nothing is uploaded to a server. Set quality to dial in the balance between file size and audio fidelity.
Drag one or more .mka files into Convertessa, or drop an entire folder to queue a batch conversion in one step.
Choose Ogg Vorbis from the output format list. Set quality to control how much the encoder compresses the audio stream.
Click Convert. Convertessa decodes and re-encodes every file locally — your Matroska audio never leaves your Mac.
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. Convertessa runs entirely offline. Every Matroska file is read and written on your Mac; nothing is sent to a server or cloud service.
Use the Quality slider in Convertessa before you click Convert. Higher quality produces larger files; lower quality produces smaller ones. The same --quality flag is available in the CLI.
Yes. Drop a folder onto Convertessa and every .mka file inside is queued for batch conversion. From the command line, point convertessa at the folder path with --to ogg and all files are processed in one run.