Your files stay on your Mac.
MP3 stores audio as lossy compressed data; WAV holds every sample as raw, uncompressed PCM. Convertessa decodes each MP3 frame and writes the full audio stream to a standard WAV file. No upload, no cloud processing — everything runs on your Mac.
Drag one file or an entire folder of MP3s into Convertessa. Batch mode processes every file in the folder without extra clicks.
Pick WAV from the output format list. Convertessa decodes the MP3 and writes the audio as uncompressed PCM — ready for DAWs, game engines, or any tool that requires WAV.
Hit Convert. Files are decoded and written locally — nothing leaves your Mac. The WAV files land alongside the 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.
No. WAV is an uncompressed container, but the audio data inside it can only be as good as the original MP3. Converting removes the encoding layer and gives you a PCM file, but frequency information lost during MP3 compression is not recovered.
Many DAWs, game engines, and broadcast tools require uncompressed WAV rather than MP3. Converting lets you import audio into software that does not accept MP3, and eliminates repeated decode overhead when the same file is played back many times.
Yes. Drag a folder into Convertessa or run convertessa ./folder/ --to wav in the terminal. Every MP3 in the folder is converted in one pass.