Your files stay on your Mac.
Convertessa reads DTS audio tracks—whether extracted from a disc or saved as standalone files—and re-encodes them as Apple M4A (AAC inside an MPEG-4 container). The result plays natively in Music.app, QuickTime, and on every iPhone or iPad. Because the conversion runs entirely on your Mac, your audio files never touch a server.
Drag one DTS file or an entire folder of them onto Convertessa. You can mix files from different sources in a single batch.
Choose Apple M4A from the output format list, then set quality to balance file size against audio fidelity. Higher quality preserves more detail from the original DTS source.
Click Convert. Convertessa processes every file locally and saves the M4A files alongside the originals—no upload, no wait.
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. Apple M4A uses AAC, a lossy codec, so some audio data is discarded during encoding. You control how much by adjusting the quality setting before converting—higher quality means larger files but less perceptible loss from the original DTS source.
Yes, as long as the DTS audio has been extracted into a standalone .dts file. Convertessa converts the file you drop on it; you handle the extraction with your ripping tool separately.
No. Convertessa runs entirely offline on your Mac. Your DTS files are never uploaded anywhere.