Your files stay on your Mac.
Convertessa reads the audio stream inside your MP4 and writes it as an uncompressed WAV file. Conversion runs entirely on your Mac — nothing is sent to a server. Drag in a single file or a whole folder to process many videos at once.
Drag one MP4 or an entire folder onto Convertessa. Files never leave your Mac.
Choose WAV from the output format list. WAV is uncompressed, so the full audio track is written without any lossy encoding.
Click Convert. Convertessa extracts the audio stream from each MP4 and saves a matching WAV file alongside it.
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. WAV is an uncompressed format. Convertessa writes the audio track exactly as it exists in the MP4 — no re-encoding losses are introduced.
Yes. Drop a whole folder onto Convertessa, or use convertessa /path/to/videos/ --to wav from the command line to process every MP4 in a directory at once.
No. Convertessa reads the MP4 and writes a new WAV file alongside it. Your original video is never modified or deleted.