Your files stay on your Mac.
iTunes M4V files bundle video and an AAC audio track together. Convertessa separates them, decodes the audio, and writes an uncompressed AIFF file — the format Logic Pro, GarageBand, and most professional DAWs read natively. The video stream is discarded; the output is audio only. Everything runs on your Mac; your files are never uploaded.
Drag a single M4V file or an entire folder into Convertessa. Batch mode processes every M4V in the folder in one pass — no upload, no cloud, no account required.
Pick AIFF from the output format list. Convertessa will decode the audio track from each M4V and write it as an uncompressed AIFF file, preserving the original sample rate and channel layout.
Click Convert. Convertessa writes one AIFF file per source M4V alongside the original, ready to import into your DAW or audio editor.
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 additional loss is introduced. The AAC audio in your M4V was already encoded with lossy compression; Convertessa decodes it and writes the result to an uncompressed AIFF container without any further processing. You get exactly what was in the source file.
Never. Convertessa runs entirely offline. Files are read from your disk, converted in memory, and written back to your disk — nothing is sent to a server or cloud service.
Yes. Drop a folder onto Convertessa and it converts every M4V file inside to AIFF in a single batch. From the command line: convertessa ./folder/ --to aiff