Your files stay on your Mac.
Converting AVI to FLAC pulls the audio track out of the AVI container and writes it as a lossless FLAC file. The audio is preserved at full fidelity — no re-encoding artifacts, no quality loss. Everything runs locally on your Mac; your files never leave your machine.
Drag one AVI file or an entire folder of them onto Convertessa. Batch mode processes every file in one pass.
Choose FLAC from the output format list. Convertessa will extract and write lossless audio for every file in your selection.
Click Convert. Convertessa extracts the audio track from each AVI and saves a matching FLAC file alongside the original.
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.
No. FLAC is a lossless format, so the audio data is preserved bit-for-bit from the original AVI. There are no re-encoding artifacts or quality loss.
Yes. Drop the folder onto Convertessa or run convertessa /path/to/folder --to flac in the terminal. Every AVI in the folder is processed in one pass.
Yes — audio and document conversions strip embedded metadata by default, so the output FLAC contains only the audio data.