Your files stay on your Mac.
WMA is Microsoft's proprietary audio format; MP3 plays on every phone, car stereo, speaker, and audio app on the market. Convertessa decodes your WMA files and re-encodes them as MP3 directly on your Mac — no internet connection, no uploads. Set the output quality before you convert, and strip embedded metadata in the same pass.
Drag one WMA file or an entire folder onto Convertessa. The app reads every WMA file it finds, including files inside subfolders.
Pick MP3 from the output format list. Because MP3 is a lossy format, you can set the quality level before converting — higher quality means larger files and better fidelity.
Click Convert. Convertessa re-encodes every file on your Mac and saves the MP3s alongside the originals. Nothing leaves your machine.
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 MP3 are lossy formats, so transcoding can introduce a small quality loss. You can minimise this by choosing a higher quality level in Convertessa before you convert.
Yes. Drop a folder onto Convertessa and it converts every WMA file inside, including files in nested subfolders. From the command line, run convertessa ./folder --to mp3.
No. Convertessa runs entirely on your Mac. Your audio files are never uploaded or transmitted to any server.