Your files stay on your Mac.
Converting Apple M4A to TTA re-encodes your audio as lossless True Audio files, preserving every sample without discarding data. TTA is widely supported by audiophile players and archiving tools that expect an open lossless container. The entire process runs on your Mac—files never leave your machine.
Drag individual M4A files or an entire folder onto Convertessa. Batch mode queues every file at once so you don't have to add them one by one.
Choose TTA from the output format list. Convertessa will encode each file to True Audio lossless and strip embedded metadata before writing the output.
Click Convert. Convertessa processes every file locally at full resolution and saves the TTA files to your chosen destination folder.
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.
Yes. TTA (True Audio) is a lossless codec—every sample from the source M4A is preserved exactly. No audio data is discarded during encoding.
Yes. Drop a folder onto Convertessa or run convertessa /path/to/folder --to tta in the terminal and every M4A inside is converted in one pass.
Yes. Convertessa strips embedded metadata (tags, cover art, and other fields) from the audio files during conversion. The resulting TTA files contain audio data only.