Your files stay on your Mac.
WMA stores audio in a compressed, proprietary container. Converting to AIFF unpacks that audio into uncompressed PCM — the format Logic Pro, DAWs, and professional audio tools read natively. Convertessa runs entirely on your Mac; your files never leave your machine.
Drag one WMA file or an entire folder into Convertessa. Batch mode processes every file in a single pass.
Select AIFF from the output format list. Convertessa preserves the original sample rate and bit depth from the source file.
Click Convert. Your AIFF files are written to disk immediately — no upload, no account, no waiting on a remote server.
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 additional loss is introduced. AIFF stores uncompressed PCM audio, so the output is a direct decode of whatever the WMA file contained. The conversion does not re-compress or further degrade the audio.
Yes. Drop the folder onto Convertessa or run convertessa ./folder --to aiff in the terminal. Every WMA file in the folder is converted in one pass.
No. Convertessa decodes and re-encodes audio entirely on your Mac. Your WMA files never leave your machine.