Your files stay on your Mac.
Converting AVI to AAC pulls the audio track out of your video and saves it as an AAC file — the format used by Apple Music, iTunes, and most streaming services. You choose the output quality before converting. Everything runs on your Mac; no file is ever uploaded.
Drag one AVI file or an entire folder into Convertessa. Batch mode processes every AVI in the folder in one pass.
Choose AAC from the output list, then set the quality level that suits your use case — AAC is a lossy format, so a higher setting means a larger file with better fidelity.
Click Convert. Convertessa extracts the audio track from each AVI and writes an AAC file alongside it. Files never leave your Mac.
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. AAC is an audio-only format. Convertessa extracts the audio track from the AVI and writes it to an AAC file; the video stream is not included in the output.
Yes. Because AAC is a lossy format, Convertessa lets you set the quality level before converting. A higher setting produces a larger file with closer-to-lossless fidelity.
Yes — drop the folder into Convertessa or run convertessa /path/to/folder --to aac from the terminal. Every AVI in the folder is converted to AAC in one pass.