Your files stay on your Mac.
Converting Matroska MKV to MPEG-TS rewraps your video and audio tracks into a transport stream container — the format expected by broadcast encoders, streaming hardware, and many set-top players. Convertessa handles the repackaging entirely on your Mac; your files never leave the machine. Convert a single file or an entire folder in one pass.
Drag one MKV file or a whole folder of them into Convertessa. Batch mode processes as many files as you have at once.
Pick MPEG-TS from the output list. Because MPEG-TS is a lossy format, you can set quality here to balance visual fidelity against file size.
Click Convert. Convertessa writes .ts files to your chosen output folder — no upload, no internet connection required.
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.
Yes. Pass a folder path to the CLI (convertessa /folder --to ts) or drag the folder onto Convertessa in the app. Every MKV inside is converted in one pass.
No. Convertessa runs entirely offline. Your MKV files are read and written locally — nothing is sent to a server or cloud service.
Yes. MPEG-TS is a lossy format, so Convertessa lets you set quality before converting. Higher quality produces larger files; lower quality produces smaller ones.