Your files stay on your Mac.
TTA (True Audio) is an open lossless codec that compresses PCM audio without discarding any samples. Converting your AIFF files to TTA produces smaller archives that decode bit-for-bit identically to the source. Convertessa runs entirely on your Mac — no file is ever uploaded.
Drag one AIFF file or an entire folder into Convertessa. Every track appears in the queue, ready to process.
Choose TTA from the output format list. Because TTA is a lossless codec, every sample from the original AIFF is preserved exactly in the output file.
Click Convert. Convertessa writes .tta files to the destination you pick without sending anything off your machine.
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. Both AIFF and TTA are lossless formats. The output TTA file decodes sample-for-sample identically to the original AIFF — no audio data is discarded during conversion.
Yes. Drop a folder onto Convertessa or run convertessa ./folder --to tta in the terminal to batch-convert every AIFF file in that directory in one pass.
No. Convertessa converts files locally on your Mac. Nothing is sent to a server — the conversion runs entirely offline.