Your files stay on your Mac.
Convertessa converts WMA audio files to AAC entirely on your Mac — no internet connection required, no files sent to any server. Drop individual tracks or a whole folder, set your preferred quality level, and Convertessa writes standard .aac files ready for Apple devices, streaming tools, or any AAC-compatible player. The original WMA files are left untouched.
Drag one or more .wma files — or an entire folder — onto Convertessa. The app queues every WMA file it finds automatically.
Pick AAC from the output format list. Because AAC is a lossy format, you can set quality to dial in the balance between file size and audio fidelity before you convert.
Click Convert. Convertessa processes every file locally on your Mac and saves the AAC output alongside your originals. No upload, no waiting on a 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.
Both WMA and AAC are lossy formats, so transcoding introduces a small amount of generation loss. You can minimise the impact by raising the AAC quality setting in Convertessa before converting.
Yes. AAC is Apple's native audio codec and plays without any extra software on all Apple devices, as well as most modern streaming platforms and media players.
Yes. Drop a folder onto Convertessa and it will find and convert every WMA file inside. From the command line, point at the folder: convertessa /path/to/folder --to aac.