Your files stay on your Mac.
Apple CAF is a flexible container tied to macOS and iOS audio workflows. Opus is an open, royalty-free codec with broad support across browsers, games, and streaming platforms. Converting CAF to Opus re-encodes the audio into the Opus format—letting you set quality to balance fidelity against file size—while keeping your files entirely on your Mac.
Drag one file or an entire folder of CAF files into Convertessa. No size limit, no internet connection required.
Pick Opus from the output list, then set quality to dial in the trade-off between file size and audio fidelity.
Click Convert. Convertessa processes every file locally and saves the Opus output alongside your originals—no waiting on uploads.
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. Convertessa runs entirely on your Mac. Your CAF files never leave your machine—conversion happens offline with no internet connection required.
Yes. Drop an entire folder onto Convertessa or use the CLI: convertessa /path/to/folder --to opus. Every CAF file in the folder is converted in one pass.
Opus at medium quality is transparent for most listening. Raise the quality setting for critical audio; lower settings work well for voice recordings and podcasts where smaller file size matters more.