Your files stay on your Mac.
Convertessa extracts the audio stream from each QuickTime MOV file and rewraps it in Apple's Core Audio Format. The audio data is preserved without re-encoding — CAF is a lossless container. Your files are processed on your Mac and never uploaded.
Drag one file or an entire folder of MOV files into Convertessa. The app reads the embedded audio track from each clip without touching the video stream.
Choose Apple CAF from the output list. Because CAF is a lossless container, the audio is rewrapped as-is — no quality setting is needed.
Click Convert. Each MOV produces a matching .caf file beside the original. Audio fidelity is fully preserved throughout.
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. Files are read and written locally — nothing is uploaded at any point.
No. CAF is a lossless container, so Convertessa rewraps the audio stream without re-encoding it. The output file contains the same audio data as the source MOV.
Yes. Drop a folder onto Convertessa to batch-convert every MOV inside, or run convertessa /path/to/folder/ --to caf from the terminal.