Your files stay on your Mac.
Convertessa re-encodes DTS audio into Opus, a modern lossy codec built for web, mobile, and streaming playback. Multichannel channel layouts from the DTS source are preserved in the output. Everything runs on your Mac — files never leave your machine.
Drag one DTS file or an entire folder into Convertessa. Batch conversion queues every file in one pass.
Pick Opus from the output list and set quality to balance file size against fidelity — higher values retain more of the original DTS audio detail.
Click Convert. Convertessa encodes each file locally and saves the Opus output alongside your 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.
Opus is a lossy codec, so some data is discarded during encoding. At moderate-to-high quality settings the difference is inaudible to most listeners. Use the quality setting in Convertessa to choose the trade-off between file size and fidelity.
Yes. Convertessa preserves the multichannel layout of your DTS source — including 5.1 and 7.1 configurations — in the resulting Opus file.
Yes. Drop the folder onto Convertessa and every DTS file inside is queued for conversion. From the command line, run convertessa *.dts --to opus in your target directory.