Your files stay on your Mac.
Converting Ogg video to Matroska MKV rewraps your footage into one of the most capable open containers available — MKV supports multiple audio tracks, chapters, and subtitle streams in a single file. Convertessa re-encodes locally on your Mac, so your video data never touches a server. Set quality to fine-tune the output, or drop an entire folder to batch-convert every .ogv file at once.
Drag one .ogv file or an entire folder into Convertessa. The app queues everything automatically, ready for batch conversion.
Pick Matroska MKV from the output format list. Set quality to control how the video stream is encoded in the new container.
Click Convert. Convertessa processes every file locally on your Mac — nothing is uploaded, and your originals are never altered.
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 preserves the original resolution. Only the container and, when you set quality, the encoding parameters are affected.
Yes. Drop an entire folder onto Convertessa and it queues every .ogv file for batch conversion to Matroska MKV automatically — no extra setup required.
Never. Convertessa runs entirely on your Mac. Your files stay local throughout the entire conversion process.