Your files stay on your Mac.
Converting WMA to Opus re-encodes each file using the open Opus codec, which sustains excellent audio fidelity at compact file sizes. The entire process runs locally — no file ever leaves your Mac. Set quality to suit your use case, or batch-convert a whole folder in one pass.
Drag a single WMA file or an entire folder into Convertessa to queue everything for conversion.
Choose Opus from the output format list. Set quality to match your target — higher values preserve more detail, lower values reduce file size.
Click Convert. Convertessa decodes each WMA file and writes Opus output alongside the originals, preserving resolution and stripping embedded metadata.
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.
Opus is a lossy codec, so re-encoding from WMA introduces a second lossy pass. Use the quality slider to set the Opus encoding level high enough to keep the result transparent for your ears. Files are never touched by a remote server, so nothing is re-compressed in transit.
No. Convertessa runs entirely offline. WMA files are decoded and Opus files are written on your Mac — no network connection is used and no data leaves your machine.
Yes. Drop a folder onto Convertessa or run convertessa ./folder --to opus in the terminal. Every WMA file inside is queued and converted in one pass.