Your files stay on your Mac.
Convertessa reads every frame in your GIF and encodes them into an AVI video container, producing a file that plays in any standard media player. Because AVI uses lossy compression, you can set quality before exporting to balance visual fidelity against file size. Everything runs locally — files never leave your Mac.
Drag one GIF or an entire folder into Convertessa. Batch mode queues every GIF it finds automatically.
Choose AVI from the output format list, then set quality to control how the frames are compressed.
Click Convert. Convertessa encodes each GIF's frames into AVI and saves the files alongside the originals — no upload, no server.
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.
GIF files contain no audio track, so the resulting AVI will be silent. If you need audio, add it in a video editor after conversion.
Yes. Drop a folder onto Convertessa or run convertessa folder/ --to avi in the terminal. Every GIF in the folder is queued and converted in one pass.
Higher quality preserves more detail but produces larger files. For most uses, start at 80–90 % and lower it only if file size is a concern.