Your files stay on your Mac.
AMR is a compressed voice codec built for mobile calls and memos—playback support outside Android is patchy. Converting to Apple M4A wraps those recordings in an AAC container that plays natively on iPhone, Mac, and every Apple app. Every conversion runs locally; your audio never leaves the machine.
Drag one AMR file or an entire folder of recordings onto Convertessa. Batch mode queues every file in one pass—no re-adding needed.
Choose Apple M4A from the output list. Because M4A uses lossy encoding, you can set quality to balance audio fidelity against file size before converting.
Click Convert. Convertessa processes everything on-device—files never leave your Mac. Finished M4A files are saved 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.
Yes. Apple M4A is the native AAC container across the Apple ecosystem. Converted files open directly in Finder, play in Apple Music, and import into GarageBand or iMovie without extra steps.
AMR is already a lossy, voice-optimised codec, so converting to M4A applies a second lossy stage. Set quality as high as your file-size budget allows to minimise generation loss. The source AMR file is never modified.
Yes. Drop the folder onto Convertessa and every AMR file inside is queued automatically. From the command line, run convertessa /path/to/folder --to m4a to batch-convert in one shot.