Your files stay on your Mac.
3GP is a compact video container built for 3G mobile networks. Converting to iTunes M4V wraps the video in Apple's native playback container, making your files compatible with iTunes, Apple TV, and iOS. Convertessa runs entirely on your Mac — no upload, no internet required.
Drag one file or an entire folder of 3GP videos onto Convertessa. Batch conversion processes every file in one pass.
Choose iTunes M4V from the output list. You can also set quality to balance file size against visual fidelity.
Click Convert. Convertessa processes everything locally — files never leave your Mac. Resolution is preserved from the source.
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. Convertessa runs entirely offline on your Mac. Your 3GP files are never uploaded or transmitted anywhere.
Yes. Drop a folder onto Convertessa or run convertessa /path/to/folder/ --to m4v to batch-convert every 3GP file in one pass.
The original resolution is preserved. Because M4V uses lossy compression, you can set quality before converting to control the trade-off between file size and visual fidelity.