Your files stay on your Mac.
Convertessa rewraps Windows Media Video into the AVI container, keeping the original resolution intact. The encode runs entirely on your Mac — no file upload, no internet required. Dial in quality to balance file size against fidelity.
Drag one .wmv file or an entire folder into Convertessa. Batch mode processes every file in one pass without extra setup.
Select AVI from the output list. You can set quality to control the encode — leave it at the default or adjust it per batch.
Click Convert. Convertessa rewraps the video locally; files never leave your Mac and the original resolution is preserved exactly.
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 preserves the original resolution exactly — it rewraps the video without any rescaling.
Never. Convertessa runs entirely offline on your Mac. Your files never leave the machine.
Yes. Drop a folder onto Convertessa or use the CLI: convertessa /path/to/folder --to avi converts every WMV inside in one batch.