Your files stay on your Mac.
Converting a QuickTime MOV to Apple M4A pulls the audio track out of the video container and wraps it in AAC — the native format for iPhones, iPads, and iTunes. The video stream is discarded; only the sound is written to the output file. Everything runs locally, so no file ever leaves your Mac.
Drag one MOV file or an entire folder into Convertessa. Batch mode processes every .mov in the folder in a single pass.
Pick Apple M4A from the output list. You can set quality to adjust the trade-off between fidelity and file size.
Click Convert. Convertessa extracts the audio and writes an .m4a file next to the original. No upload, no account 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.
The audio is re-encoded to AAC, which is lossy. Use the quality setting to choose the trade-off between fidelity and file size — higher quality produces a larger file.
Yes. Drop the folder onto Convertessa or run convertessa /path/to/folder --to m4a in the terminal. Every .mov in the folder is processed in a single pass.
No. Convertessa runs entirely on your Mac. Files are never sent to a server or cloud service.