Your files stay on your Mac.
Ogg Vorbis is an open audio format with limited support on Apple devices, consumer hardware, and most streaming platforms. Converting to AAC gives your audio files broad compatibility — iPhones, iPads, Apple Music, and the majority of modern players handle AAC natively. Convertessa runs the conversion entirely on your Mac; your files never leave your machine.
Drag a single .ogg file or an entire folder into Convertessa. There is no upload step — everything stays on your Mac.
Choose AAC from the output format list. Set the quality level to balance audio fidelity and file size before you convert.
Click Convert. Convertessa processes every file locally and saves the .aac output to the folder you choose.
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. Because AAC is a lossy format, Convertessa lets you set the quality level before converting. A higher setting preserves more detail; a lower setting produces smaller files.
No. Convertessa runs entirely on your Mac. Your audio files are never sent to a server or any external service.
Yes — drop an entire folder into Convertessa, or use the CLI with a wildcard (convertessa /folder/*.ogg --to aac) to batch-convert all files in one pass.