Your files stay on your Mac.
MPEG-TS (MPEG Transport Stream) is the container format used for broadcast TV streams, over-the-air recordings, and Blu-ray captures — stored as .ts files on your Mac. Convertessa reads .ts files locally and converts them into 23 output formats, including MP4, MKV, MOV, and audio-only targets such as MP3, AAC, and FLAC. Every conversion runs on your machine; files are never uploaded.
Drag a .ts file into Convertessa or use File → Open to browse to it. Drag a folder to queue every .ts file inside it at once.
Choose MP4, MKV, MOV, MP3, or any of the 23 supported targets from the output list. Because most video targets are lossy, you can also set quality before you convert.
Click Convert. Convertessa processes every file locally on your Mac — no upload, no account, 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 the folder path to the CLI (convertessa /recordings/ --to mp4) or drag the folder onto the Convertessa window to queue every .ts file it contains.
Yes. Choose an audio-only output — MP3, AAC, FLAC, WAV, Opus, and others are all available — from the output list. Convertessa pulls the audio stream and writes it to the format you picked.
No. Convertessa runs entirely offline on your Mac. Your files are processed locally and never sent to any server or cloud service.