Your files stay on your Mac.
DTS is a lossy surround audio codec found on Blu-rays and DVDs. Converting to FLAC decodes the DTS stream to lossless PCM and wraps it in an open FLAC container. The output plays in any FLAC-compatible player without requiring a DTS decoder.
Drag one DTS file or an entire folder into Convertessa. The app reads your files locally — nothing is uploaded.
Pick FLAC from the output format list. Convertessa decodes each DTS stream to lossless PCM and encodes it as FLAC.
Click Convert. Convertessa processes every file in parallel and saves the FLAC files 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.
FLAC is a lossless container, so the decoded PCM audio is stored without further degradation. Because DTS itself is a lossy codec, the FLAC captures exactly what the DTS stream contained — no better, no worse.
Yes. Drop an entire folder onto Convertessa or run convertessa ./folder --to flac in the terminal. Every DTS file in the folder is converted in a single pass.
Yes. Convertessa strips embedded metadata during conversion, so the output FLAC files contain no residual tags or identifiers from the source.