Your files stay on your Mac.
MPEG-TS wraps broadcast and DVR video in a transport-stream container. Converting to AVI repacks those streams into the AVI container, producing a file that legacy editors and media players recognise without extra codecs. Convertessa does the whole job locally on your Mac—no upload, no cloud, no waiting.
Drag one .ts file or an entire folder of recordings into Convertessa. The queue populates instantly—no upload, because everything runs on your Mac.
Choose AVI from the output format list. Because AVI uses lossy encoding, you can also set quality before you start to control the trade-off between file size and fidelity.
Hit Convert. Convertessa processes every file in the queue, preserving the original resolution and stripping embedded metadata. Your AVI files land alongside the 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.
Yes. Point Convertessa at a folder and every MPEG-TS file inside is converted to AVI in one pass. Use convertessa /path/to/folder --to avi from the terminal, or drag the folder into the app.
No. Convertessa runs entirely offline. Your MPEG-TS recordings are never uploaded to any server—conversion happens locally on your Mac.
Yes. AVI uses lossy encoding, so Convertessa lets you set quality before conversion starts. A higher quality setting retains more detail at the cost of a larger file.