Your files stay on your Mac.
Convertessa re-encodes your AAC audio into WavPack's lossless container, capturing every bit of audio data present in the source file. The resulting .wv files are ready for archiving or further editing without introducing any additional quality loss. Everything runs locally on your Mac — no upload, no internet required.
Drag one or more .aac files onto Convertessa, or use File → Open to browse your library. You can also drop an entire folder to queue it for batch conversion.
Choose WavPack from the output format list. Convertessa encodes each file to lossless .wv with no further quality loss beyond what the original AAC encoding already introduced.
Click Convert. Your .wv files are saved alongside the originals. A whole folder of AAC files converts in a single pass.
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. WavPack is lossless, so it preserves exactly the audio data present in your AAC file — it cannot recover information discarded during the original AAC encoding. The benefit is that any subsequent re-encoding or processing from the .wv file adds no further generation loss.
Yes. AAC uses lossy compression to achieve small file sizes; WavPack stores audio losslessly, so .wv files are typically several times larger than their AAC counterparts.
Yes. Drop a folder onto Convertessa or run convertessa /path/to/folder --to wv in Terminal to batch-convert all AAC files in one pass. Files never leave your Mac.