Your files stay on your Mac.
Convertessa unpacks each .7z archive and writes its contents into a .tar.gz bundle — no files leave your Mac. The internal directory tree and file contents are preserved; only the container format changes. Convert a single archive or point it at a folder to process every .7z file in one pass.
Drag one or more .7z archives onto Convertessa, or select a folder to queue every archive inside it for batch conversion.
Choose TAR + Gzip from the output format list. Convertessa will produce a .tar.gz file for each source archive, keeping the original filenames.
Click Convert. Convertessa unpacks each .7z archive and repacks its contents as .tar.gz. Everything runs locally — nothing is uploaded.
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. Convertessa reads the directory tree stored in the .7z file and recreates it exactly inside the .tar.gz output — no paths are flattened or renamed.
Yes. Convertessa strips embedded metadata from the archive during conversion, so the resulting .tar.gz contains only the file and folder contents.
Yes. Drop a folder onto the app or run convertessa ./folder/ --to tar.gz from the command line to convert every .7z file inside it in a single pass.