Your files stay on your Mac.
DVD VOB files bundle video, audio, and subtitle streams into a single disc container. Converting a VOB to MKA extracts the audio track and repackages it in the open Matroska Audio format, discarding the video and subtitle data you don't need. The result is a standard MKA file ready for any Matroska-capable player.
Drag one VOB file or an entire folder into Convertessa. Everything runs locally on your Mac — no files are uploaded to any server.
Pick Matroska (MKA) from the output format list. Because Matroska uses lossy compression, you can set quality here to balance file size against audio fidelity.
Click Convert. Convertessa extracts the audio stream from each VOB and writes an MKA file alongside the original.
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.
Convertessa extracts only the audio stream when converting to Matroska (MKA). The video frames and subtitle data contained in the VOB are not included in the output — MKA is an audio-only container.
Matroska (MKA) uses lossy compression, so the quality setting in Convertessa controls the trade-off between file size and audio fidelity. A higher quality value retains more detail from the source VOB audio track.
Yes. Drag the VIDEO_TS folder into Convertessa or run convertessa ./VIDEO_TS/ --to mka in the terminal. Convertessa processes every VOB in the folder and writes one MKA file per VOB.