Your files stay on your Mac.
Convertessa reads the audio track embedded in your Windows Media files and writes it out as AU — the uncompressed audio format native to Unix and macOS environments. Processing happens entirely on your Mac: files never leave your drive and no internet connection is required. Convert a single clip or an entire folder in one pass.
Drag one or more .wmv files into Convertessa, or point it at a folder to queue every Windows Media file inside.
Pick AU from the output list. Convertessa will extract each file's audio track and write it as a .au file, preserving the original sample rate and bit depth.
Click Convert. Each .au file lands next to its source. EXIF and embedded metadata are stripped from the output automatically.
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. Every file is processed locally on your Mac. Nothing is uploaded and no network connection is used at any point.
AU is an audio-only format, so Convertessa extracts the audio track and discards the video stream. The resulting .au file contains only audio.
Yes. Pass the folder path on the command line — convertessa /path/to/folder --to au — and Convertessa will convert every Windows Media file it finds inside.