Your files stay on your Mac.
Convertessa re-encodes your MP3 audio into the Ogg Vorbis format entirely on your Mac — no upload, no server. Because both formats are lossy, you can set the output quality before converting to control the trade-off between file size and fidelity. Batch mode lets you point at a whole folder and convert every MP3 inside in one pass.
Drag one MP3 or an entire folder onto Convertessa. Files never leave your Mac.
Pick Ogg Vorbis from the output format list. Set the quality level to tune the balance between file size and audio fidelity.
Click Convert. Convertessa re-encodes each file locally and saves the Ogg Vorbis output 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.
Both MP3 and Ogg Vorbis are lossy formats, so re-encoding introduces a second generation of compression. To minimise the loss, set a high quality level before converting. Convertessa lets you choose that level in the output options.
Yes. Drop a folder onto Convertessa or run convertessa ./folder/ --to ogg in the terminal. Every MP3 inside is converted in one pass.
No. Convertessa runs entirely offline on your Mac. Files are read and written locally — nothing is sent to a server.