Your files stay on your Mac.
Converting MPEG to AIFF extracts the audio stream and decodes it to uncompressed PCM samples stored in Apple's AIFF container. The resulting file is lossless and compatible with Logic Pro, Final Cut Pro, and any DAW that reads AIFF. Everything runs on your Mac — no file ever leaves the machine.
Drag one or more MPEG files — or an entire folder — onto Convertessa. You can also pass files directly on the command line.
Choose AIFF from the output format list. Because AIFF is lossless, there are no quality trade-offs to configure.
Click Convert. Convertessa decodes each MPEG audio stream to raw PCM and writes AIFF files beside the originals. No internet connection required.
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.
AIFF stores uncompressed PCM audio, so the conversion is a decode — not a re-encode to another lossy format. You get the full PCM audio that was encoded in the MPEG stream with no additional generation loss.
Yes. Drag a folder onto Convertessa or run convertessa /folder --to aiff to batch-convert every MPEG file in one pass.