Your files stay on your Mac.
ZIP archives bundle files with built-in compression. TAR bundles files into a single stream without altering them, preserving Unix permissions and timestamps. Convertessa extracts each ZIP locally and repackages the contents into a .tar archive — no upload, no cloud, everything stays on your Mac.
Drag one ZIP or an entire folder of ZIPs onto Convertessa. The app reads each archive locally — your files never leave the Mac.
Choose TAR from the output format list. Convertessa will extract the ZIP contents and repack them into a plain TAR archive.
Click Convert. Each ZIP produces a matching .tar file alongside the original. Batch jobs run in parallel so large collections finish fast.
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. TAR is an uncompressed archive format — it bundles files into a single stream without reducing their size. If you also need compression, consider converting to TAR.GZ or TAR.BZ2 instead.
Yes. Drop a folder onto Convertessa or run convertessa *.zip --to tar in the terminal. Each ZIP becomes its own .tar file.
TAR supports Unix permissions and modification timestamps. Convertessa repackages the ZIP contents into TAR format, carrying those attributes through where they were present in the source archive.