Your files stay on your Mac.
Converting Ogg to Apple M4A re-encodes your audio as AAC inside an MPEG-4 container — the native format for Apple Music, iTunes, and iOS devices. Convertessa does the work locally; no file ever leaves your Mac. Because M4A uses a lossy codec, you can set quality to balance file size and fidelity before you convert.
Drag one file or an entire folder of .ogv files onto Convertessa. Batch conversion processes every file in one pass.
Choose Apple M4A from the output format list. Set quality if you want to tune the AAC encoding for size or fidelity.
Click Convert. Convertessa encodes each file locally and saves the .m4a files alongside the originals. Nothing is uploaded.
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.
M4A uses AAC, a lossy codec, so each encode involves some quality trade-off. Convertessa lets you set quality before converting so you control the balance between file size and fidelity.
Yes — drop a folder onto Convertessa or run convertessa *.ogv --to m4a from the command line. Every .ogv file is converted in a single pass.
No. Convertessa runs entirely offline on your Mac. Your files are never sent to a server or cloud service.