Your files stay on your Mac.
Apple CAF is the native container format for Core Audio on macOS and iOS — it carries lossless PCM audio without re-encoding. Converting from FLAC wraps the same audio data in a CAF container, keeping every sample intact. Files never leave your Mac.
Drag one file or an entire folder into Convertessa. FLAC files are read locally — nothing is uploaded.
Pick Apple CAF from the output list. The lossless audio stream is rewrapped into a CAF container with no re-encoding.
Click Convert. Convertessa writes your CAF files alongside the originals and strips embedded metadata from 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.
No. Both FLAC and Apple CAF are lossless formats. Convertessa rewraps the audio stream without re-encoding, so every sample is preserved exactly.
Apple CAF (Core Audio Format) is the container Apple uses for audio in macOS and iOS frameworks. It is required by some Apple developer tools and system APIs that do not accept FLAC directly.
Yes. Pass the folder path on the command line (convertessa ./my-flacs/ --to caf) or drag the folder into the app window. Every FLAC file inside is converted in one pass.