Your files stay on your Mac.
3GP is a compact container built for 3G mobile devices, wrapping AAC or AMR audio alongside video. Convertessa reads the audio track from each file and re-encodes it as WavPack — a lossless format that reduces file size without discarding a single sample. Every conversion runs entirely on your Mac; no file is ever uploaded.
Drag one .3gp file or an entire folder onto the Convertessa window. Batch mode picks up every file in the folder automatically.
Select WavPack from the output format list. Convertessa will extract the audio track from each 3GP file and encode it as a lossless .wv file, preserving the original sample rate and bit depth.
Click Convert. Your WavPack files appear alongside the originals. No upload, no account — the conversion runs offline on 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. WavPack in lossless mode preserves every audio sample from the source 3GP file — no data is discarded during the conversion.
Yes. Convertessa strips embedded EXIF and container metadata from the source file during conversion, so the WavPack output contains only the audio data.
Yes. Drop a folder onto the Convertessa window or run convertessa ./folder/ --to wv in the terminal. Every .3gp file in the folder is converted in a single batch.