Your files stay on your Mac.
MPEG-TS packages video, audio, and subtitle tracks for broadcast and IP delivery. Converting to Matroska MKV preserves every track in a container built for local playback and long-term archiving. Convertessa handles the rewrap entirely on your Mac — no upload, no cloud processing.
Drag one .ts file or an entire folder of recordings into Convertessa. Batch mode processes every file in a single pass without re-encoding unless you want it.
Choose Matroska MKV from the output list. Set quality to control the encode if you need to re-compress, or leave it at lossless to do a straight container rewrap.
Click Convert. Convertessa rewraps each file locally — nothing leaves your Mac. Finished MKVs appear in the output folder with all original tracks intact.
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. Convertessa copies all streams — video, audio, subtitles, and chapter markers — from the MPEG-TS container into MKV without dropping any track.
Yes. Convertessa removes embedded metadata from the MKV output, so broadcast service information and transport-stream headers do not carry over to the finished file.
Yes. Run convertessa /path/to/folder --to mkv and every .ts file in the folder is converted in one batch without any extra steps.