Your files stay on your Mac.
WAV stores audio as raw, uncompressed PCM — accurate but large. Converting to MP3 applies lossy compression, shrinking each file dramatically while keeping the audio usable. Convertessa handles the encoding entirely on your Mac; nothing is uploaded.
Drag one WAV file or an entire folder into Convertessa. Batch mode queues every WAV file it finds.
Choose MP3 from the output format list, then set quality to dial in the trade-off between file size and audio fidelity.
Click Convert. Convertessa encodes every file locally — no internet required — and saves the MP3s alongside your originals.
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.
MP3 is a lossy format, so some audio data is discarded during encoding. You control the trade-off: a higher quality setting preserves more detail at the cost of a larger file, while a lower setting shrinks the file further.
No. Convertessa runs entirely offline on your Mac. Your files never leave your machine — no upload, no cloud processing, no account required.
Yes. Drop a folder onto Convertessa and it converts every WAV file inside. From the command line, point it at a directory: convertessa ./folder/ --to mp3.