Your files stay on your Mac.
FLAC stores every audio sample without loss — faithful to the source, but large on disk. Ogg Vorbis re-encodes that audio as an open, compressed stream at the quality level you set. Convertessa runs the whole process locally on your Mac; your files never leave your disk.
Drag a single track or an entire folder of FLAC files into Convertessa. Batch mode processes every file in one pass.
Choose Ogg Vorbis from the output list, then set the quality level that fits your needs — higher quality produces a larger file.
Click Convert. Convertessa re-encodes each FLAC file to Ogg Vorbis offline, with no upload and no waiting on a remote server.
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 — Ogg Vorbis is a lossy format, so the conversion re-encodes the audio at the quality level you set. Choose a higher quality setting to minimise the audible difference from the original FLAC.
Yes. Point Convertessa at a folder and it converts every FLAC file inside — including sub-folders — to Ogg Vorbis in one pass. From the CLI: convertessa ./library/ --to ogg.
Ogg Vorbis is a fully open, patent-free codec with broad support on Linux, Android, and open-source media players. If your target playback environment supports it, it is a compact alternative to FLAC without licensing concerns.