Your files stay on your Mac.
TTA (True Audio) is a lossless codec with limited native support outside dedicated audio software. Converting to Apple M4A produces an AAC file that plays on iPhones, Macs, iPads, and nearly all media players. Set quality to control the trade-off between file size and audio fidelity.
Drag one TTA file or an entire folder into Convertessa. Every file is processed locally — nothing is uploaded.
Choose Apple M4A from the output list. Set quality to control the trade-off between file size and audio fidelity.
Click Convert. Convertessa encodes each file to AAC M4A and saves the results 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.
Yes. TTA is lossless and Apple M4A (AAC) is lossy, so some audio data is discarded during encoding. Use the quality setting in Convertessa to choose a higher value and minimise the audible difference.
Yes. M4A with AAC encoding is Apple's native audio format and plays without any additional app on iPhones, iPads, Macs, and Apple TV.
Yes. Drop an entire folder into Convertessa and every TTA file inside is converted to M4A in one pass — no need to add files one by one.