Your files stay on your Mac.
Convertessa reads Apple CAF containers and writes standard AIFF files that open in any audio application. Both formats are lossless, so every sample is carried through unchanged. Files never leave your Mac.
Drag one file or an entire folder onto Convertessa. Batch mode processes every CAF in the folder in a single pass.
Choose AIFF from the output format list. Convertessa will write one AIFF file for every CAF you dropped.
Click Convert. Your AIFF files appear alongside the originals, ready to open in any audio editor or player.
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. Both CAF and AIFF are lossless containers. Convertessa copies the audio data without re-encoding, so the output AIFF is bit-for-bit identical to the source.
Yes. Drop a folder onto Convertessa, or run convertessa *.caf --to aiff in the terminal. Every CAF in the selection is converted in a single pass.
Yes. Convertessa preserves the original resolution — sample rate, bit depth, and channel layout are carried through unchanged to the output AIFF.