Your files stay on your Mac.
Monkey's Audio (APE) stores audio without any loss, but almost no phones, speakers, or media apps can play it natively. Converting to MP3 produces a file that works everywhere. Because the source is lossless, you set the MP3 quality level yourself — Convertessa handles the encoding entirely on your Mac, with nothing uploaded.
Drag one APE file or an entire folder into Convertessa. The app reads Monkey's Audio tracks directly — no intermediate conversion needed.
Pick MP3 from the output format list. Because MP3 is lossy, you can also set the quality level to balance file size against audio fidelity before you convert.
Click Convert. Every file is processed locally on your Mac — nothing is uploaded, and your original APE files are never overwritten.
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.
MP3 is a lossy format, so some audio data is discarded during encoding. Convertessa lets you set the quality level — higher settings preserve more detail at the cost of a larger file. Because the source is lossless APE, you are starting from the best possible material before any encoding decisions are made.
Yes. Drop a folder of APE tracks onto Convertessa and it converts every file in one pass. The output MP3s are saved alongside the originals.
No. All conversion runs locally on your Mac. Your audio files never leave your machine.