Your files stay on your Mac.
AAC is a compressed format optimised for small file sizes at the cost of encoding loss. Converting to WAV unpacks the audio into an uncompressed PCM stream — the format every DAW, audio editor, and broadcast tool reads natively. The conversion runs entirely on your Mac; files never leave your machine.
Drag one .aac file or an entire folder into Convertessa. Batch mode processes every AAC file in the folder in a single pass.
Pick WAV from the output format list. Convertessa writes standard PCM WAV, preserving the original sample rate and bit depth.
Click Convert. WAV files appear alongside the originals. No upload, no account, no internet connection needed.
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. WAV is uncompressed, but it cannot recover detail discarded when the AAC was originally encoded. The WAV contains exactly the audio decoded from the AAC — larger in size, not higher in quality than the source.
Yes. Convertessa decodes the AAC stream and writes WAV at the source sample rate and bit depth. No resampling or dithering is applied.
Yes. Drop a folder onto Convertessa or run convertessa /path/to/folder --to wav in the terminal. Every .aac file in the folder is converted in one pass.