Your files stay on your Mac.
MPEG-TS is a transport-stream container used for broadcast video and device recordings. Converting to MP3 extracts the audio track and encodes it as a widely supported lossy file. Set the quality level to balance file size against fidelity before you export.
Drag one .ts file or an entire folder of recordings into Convertessa. Everything stays on your Mac — nothing is uploaded.
Choose MP3 from the output list. Set the quality level to control the trade-off between file size and audio fidelity.
Click Convert. Convertessa processes every file locally and saves the MP3s alongside your originals.
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 runs entirely offline on your Mac. Your .ts files never leave your machine.
Yes. Drop a folder onto Convertessa or pass a directory path in the CLI and every .ts file inside is converted in one go.
Choose MP3 from the output list, then set the quality slider before converting. Higher quality produces larger files; lower reduces size at the cost of some audio fidelity. Voice recordings need less quality than music.