Your files stay on your Mac.
Windows Media Video (.wmv) is Microsoft's proprietary container format, widely used on Windows PCs but poorly supported on Mac, iPhone, and modern streaming platforms. Convertessa reads your .wmv files locally and writes them to any format you choose — MP4, MKV, WebM, audio-only outputs, and more. Nothing is uploaded; every conversion runs entirely on your Mac.
Drag a single .wmv file into Convertessa, or point it at a folder to process every Windows Media file inside at once.
Pick a target from the output list — MP4, MKV, MOV, WebM, MP3, AAC, FLAC, WAV, and 19 more. Set quality to tune the trade-off between file size and fidelity.
Click Convert. Convertessa writes the output file next to the original. No account, no internet connection, no waiting on a remote 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.
Yes. Choose any audio target — MP3, AAC, FLAC, WAV, AIFF, OGG, Opus, WavPack, and more — and Convertessa pulls the audio track from your .wmv file and writes it to that format.
Entirely. Convertessa runs offline; your .wmv files never leave your Mac. Conversion speed is limited only by your CPU, not your network.
Drag the folder into Convertessa, or run convertessa ./folder/ --to mp4 in Terminal. Every .wmv file in the folder is converted in one pass.