Your files stay on your Mac.
Convertessa re-encodes your Ogg Vorbis files into FLAC, a lossless audio format, directly on your Mac. Every file stays on your machine — nothing is uploaded to a server or cloud service. Drag in a single track or an entire folder and convert the batch in one pass.
Drag one .ogg file or an entire folder onto Convertessa. The app reads every track and queues them for conversion.
Choose FLAC from the output format list. Convertessa targets the lossless FLAC format for every queued track.
Click Convert. Convertessa processes each file locally — nothing leaves your Mac. FLAC files land beside 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.
No. Convertessa runs entirely on your Mac. Your files never leave your machine, and no account or internet connection is required.
Yes. Drag a folder onto Convertessa or run convertessa /path/to/folder --to flac in the terminal. Every .ogg file in the folder is converted in a single pass.
Yes. FLAC is a lossless format, so the output files are typically larger than the compressed Ogg Vorbis source. The FLAC file captures exactly what is encoded in the original .ogg track.