Your files stay on your Mac.
Convertessa reads each TAR archive on your Mac and writes a new ZIP — no upload, no cloud, no network required. ZIP is natively supported on every major OS and browser, making it the most portable format for sharing archives. Drop a whole folder of TARs to convert them all in a single pass.
Drag one TAR or an entire folder of TARs onto Convertessa. Your files stay on your Mac throughout.
Pick ZIP from the output list. Convertessa will repack every TAR you dropped into its own ZIP file.
Click Convert. Convertessa reads each TAR locally and writes the ZIP alongside it — no upload, no waiting.
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 repacks the same files and folder structure into ZIP format — the contents are unchanged.
Yes. Drop a folder onto Convertessa or run convertessa *.tar --to zip in your terminal and every TAR in that directory is converted in one pass.
No. Convertessa runs entirely on your Mac. Your files are never uploaded anywhere.