Your files stay on your Mac.
Apple CAF (Core Audio Format) is Apple's native audio container for macOS and iOS, capable of holding high-fidelity audio with no file-size ceiling. Convertessa reads .caf files and converts them to 13 open formats — including MP3, FLAC, AAC, and WAV. Every conversion runs locally; no file is ever uploaded.
Drag a single .caf file or an entire folder onto Convertessa. Batch mode processes every CAF in the folder in one pass without any extra setup.
Pick a target format from the output list — AAC, MP3, FLAC, WAV, OGG, OPUS, and more. Convertessa never pre-selects or guesses your target.
Click Convert. Output files are saved next to the originals. Audio fidelity from the source CAF is carried through to the output.
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. Drag a folder onto Convertessa and it converts every .caf file inside in one pass. From the terminal, run convertessa *.caf --to flac to batch-convert in the current directory.
No. Convertessa runs entirely on your Mac — no internet connection is required and no audio data is sent anywhere. Files never leave your machine.
Convertessa converts Apple CAF to AAC, AC3, AIFF, AU, FLAC, M4A, MKA, MP3, OGG, OPUS, TTA, WAV, and WV. Choose your target from the output list before you convert.