Your files stay on your Mac.
3GP is the compact video container developed for 3G mobile networks, found on older Android handsets, feature phones, and carrier-recorded clips. Convertessa reads 3GP files and converts them to modern video containers like MP4, MOV, MKV, or WebM, or extracts the audio track to AAC, MP3, FLAC, and more. Every conversion runs locally on your Mac — nothing is uploaded.
Drag a single 3GP file into Convertessa, or drop an entire folder to queue a batch conversion.
Pick a target from the output list — MP4, MOV, MKV, WebM, MP3, AAC, FLAC, and 16 more. Set quality to balance file size and fidelity when the target format is lossy.
Click Convert. Convertessa processes the file on your Mac and saves the result next to the original.
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. Drop a folder onto Convertessa and every 3GP file inside converts in one pass. From the terminal: convertessa *.3gp --to mp4.
Convertessa supports 23 output formats for 3GP: AAC, AC3, AIFF, AU, AVI, CAF, FLAC, GIF, M4A, M4V, MKA, MKV, MOV, MP3, MP4, MPEG, OGG, Opus, TS, TTA, WAV, WebM, and WV.
No. Convertessa runs entirely offline. Your 3GP files are processed locally on your Mac and never sent to any server.