Your files stay on your Mac.
Convertessa rewraps or re-encodes your Matroska MKV files into QuickTime MOV—the native container for iMovie, Final Cut Pro, and QuickTime Player. Every conversion runs entirely on your Mac; no file ever leaves your machine. Because MOV uses lossy codecs, you can set quality before converting.
Drag one file, multiple files, or an entire folder of MKV files onto Convertessa. Batch mode processes everything in one pass.
Pick QuickTime MOV from the output format list. Because MOV uses lossy codecs, you can set quality to balance file size and visual fidelity.
Click Convert. Convertessa processes every file locally—nothing is uploaded and your originals are never touched.
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.
It depends on the codec inside the MKV. When the video stream is already compatible with the MOV container, Convertessa can rewrap it without re-encoding. Otherwise it re-encodes the stream—you can set quality to control the result.
MOV uses lossy codecs, so some generation loss is possible during re-encoding. Use the quality control to push fidelity as high as you need. Original resolution is always preserved.
Yes. Drop the folder onto Convertessa or run convertessa /path/to/folder --to mov from the command line. Every MKV inside is converted in one pass.