Your files stay on your Mac.
AIFF stores uncompressed PCM audio, which gives you faithful playback but large files. Ogg Vorbis encodes that same audio as a lossy compressed stream, cutting file size dramatically while keeping the listening experience intact. Convertessa runs the conversion entirely on your Mac — nothing is uploaded.
Drag one file or a whole folder of .aiff files onto Convertessa. Batch conversion processes every file in a single pass.
Choose Ogg Vorbis from the output list, then set quality to control the trade-off between file size and audio fidelity.
Click Convert. Your Ogg Vorbis files land in the output folder instantly — no account, no internet connection required.
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.
Ogg Vorbis is a lossy format, so some audio data is discarded during encoding. Use a higher quality setting in Convertessa to minimize the difference. For archiving, keep the original AIFF.
Yes. Drop a folder onto Convertessa or pass a directory to the CLI — convertessa /path/to/folder --to ogg — and every AIFF file inside is converted in one batch.
No. Convertessa runs entirely on your Mac. Your AIFF files are read and written locally — nothing ever leaves your machine.