Your files stay on your Mac.
Convertessa reads your WMV files and writes standard MP4 output directly on your Mac—no file ever leaves your machine. Drop a single clip or an entire folder and convert everything in one pass. Set quality before you export, and your original resolution is preserved throughout.
Drag one or more WMV files—or a whole folder—into Convertessa. Everything stays on your Mac and is never uploaded anywhere.
Choose MP4 from the output format list. Set quality to control the balance between file size and visual fidelity.
Click Convert. Convertessa batch-processes all your files and writes MP4 output alongside the originals, preserving resolution in every file.
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 files never leave your machine—conversion happens locally with no internet connection required.
Yes. Drop an entire folder into Convertessa and it batch-converts every WMV file inside it to MP4 in one pass. You can also run convertessa /path/to/folder --to mp4 from the command line.
Yes. Convertessa preserves the original resolution of your WMV files in the MP4 output. Use the quality setting to reduce file size without affecting resolution.