Your files stay on your Mac.
Convertessa pulls the audio track out of your 3GP file and writes it as uncompressed PCM AIFF — the format DAWs, audio editors, and Final Cut Pro expect. No upload, no cloud: everything runs on your Mac. Batch mode converts a whole folder of mobile recordings in one pass.
Drag one 3GP file or an entire folder of recordings into Convertessa. All processing happens locally — nothing is uploaded anywhere.
Pick AIFF from the output format list. Convertessa will extract the audio stream and write it as uncompressed PCM AIFF, preserving the original audio resolution.
Click Convert. AIFF files appear alongside your originals. Metadata is stripped from every output file automatically.
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. AIFF stores audio as uncompressed PCM, so the conversion preserves the audio exactly as it was encoded in the 3GP container. The original resolution is kept intact.
Yes. Drop the folder into Convertessa or run convertessa /path/to/folder --to aiff to batch-convert every 3GP file in one pass.
No. Convertessa runs entirely offline on your Mac. Your files never leave your device.