Your files stay on your Mac.
Windows Media Video is a Windows-native format that iTunes, Apple TV, and iOS devices cannot play directly. Converting to M4V rewraps the video in a container that Apple software recognises natively. Convertessa runs the entire conversion on your Mac — nothing is uploaded and no account is needed.
Drag one WMV file or an entire folder into Convertessa. Batch mode queues every file in the folder and converts them in a single pass.
Choose iTunes M4V from the output format list. Set quality to balance file size and playback fidelity before you convert.
Click Convert. Convertessa works fully offline — your files never leave your Mac, and metadata is stripped from every output file automatically.
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. M4V is the container format iTunes and Apple TV expect. Once converted, you can add the files to your iTunes library or copy them to any Apple device without further steps.
Completely. Convertessa converts files locally on your Mac. No file, frame, or fragment is sent to a server at any point during or after conversion.
Yes — drag the folder onto Convertessa and it will process every WMV file inside in one batch. You can also use the CLI: convertessa ./videos/ --to m4v.