Your files stay on your Mac.
WAV stores raw PCM audio with no compression. TTA (True Audio) encodes the same audio losslessly, reducing file size without discarding a single bit. Converting WAV to TTA gives you smaller files that decode back to bit-for-bit identical audio.
Drag one WAV file or an entire folder into Convertessa. The app reads everything locally — nothing leaves your Mac.
Choose TTA from the output format list. Convertessa keeps your original WAV files untouched and encodes the new files losslessly.
Click Convert. Convertessa writes the TTA files at the original sample rate and bit depth — resolution is preserved exactly.
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. TTA is a lossless codec. The encoded file decodes back to bit-for-bit identical PCM audio — no data is discarded during conversion.
Yes. Drop a folder onto Convertessa in the app, or pass a folder path to the CLI: convertessa ./folder --to tta. Every WAV inside is converted in one pass.
Yes. Convertessa runs entirely offline — your audio is never uploaded to a server. Conversion happens on-device, with no account required.