Your files stay on your Mac.
WAV stores audio as raw, uncompressed PCM — lossless but large. Converting to Opus produces a compact lossy file with broad support across browsers, apps, and streaming pipelines. Convertessa does the entire encode locally on your Mac; your audio never leaves the device.
Drag a single WAV file or an entire folder into Convertessa. Batch mode picks up every WAV in the folder and queues them in one pass.
Choose Opus from the output format list. Because Opus is a lossy format, you can also set quality to dial in the trade-off between file size and fidelity before converting.
Click Convert. Convertessa encodes each file on-device and writes the Opus output alongside the originals. No internet connection required.
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 format, so some audio data is discarded. At higher quality settings the difference is inaudible to most listeners. Use Convertessa's quality control to find the right balance for your content.
No. Convertessa runs entirely offline on your Mac. Your files are never sent to a server or cloud service — conversion happens on-device.
Yes. Drop a folder onto Convertessa, or run convertessa ./folder --to opus from the command line to convert every WAV file in the folder in one batch.