Your files stay on your Mac.
WavPack compresses AU audio losslessly, shrinking raw PCM files while keeping every sample bit-for-bit intact. The resulting .wv files decode to the original audio exactly — nothing is discarded or approximated. Convertessa runs the entire conversion on your Mac; your files never leave the machine.
Drag one AU file or an entire folder of AU files onto Convertessa. Batch mode processes every file in the folder in a single pass.
Pick WavPack (.wv) from the output format list. Convertessa preserves the original sample rate, bit depth, and channel layout unchanged.
Click Convert. Output .wv files are written alongside the originals — or to a destination folder you specify — without uploading anything.
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.
Yes. WavPack's lossless mode encodes every sample from the AU source exactly. The .wv file decodes bit-for-bit to the original PCM data — no audio information is altered or removed.
No. Convertessa converts entirely on your Mac. Nothing is uploaded to any server at any point in the process.
Yes. Drop a folder onto Convertessa, choose WavPack, and every AU file inside is converted in one batch. From the command line: convertessa ./folder --to wv.