Your files stay on your Mac.
VOB is the container format burned onto DVD discs, carrying MPEG-2 video and AC3 audio. WebM wraps VP9 video and Opus audio in an open, royalty-free format that plays natively in every modern browser and media player. Convertessa re-encodes your VOB footage to WebM entirely on your Mac — no upload, no cloud, files never leave your machine.
Drag one or more .vob files into Convertessa, or drop an entire DVD VIDEO_TS folder to queue all titles at once.
Pick WebM from the output format list. Set quality to control the VP9 encode level — higher values mean sharper detail at a larger file size.
Hit Convert. Convertessa re-encodes each VOB to WebM locally. Original resolution is preserved throughout.
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 on your Mac. Your VOB files are never uploaded — conversion happens offline and nothing leaves your machine.
Yes. Drop the entire VIDEO_TS folder (or any directory of .vob files) onto Convertessa and it will batch-convert every file to WebM in one pass.
WebM uses lossy VP9 encoding, so quality is a trade-off between sharpness and file size. A mid-range setting works well for most web delivery; raise it for archival use where file size is less of a concern.