Your files stay on your Mac.
Convertessa reads your Mamiya MEF RAW files and writes standard JPG images — no camera software required. You control the output quality, and every converted image keeps the original pixel resolution. Nothing leaves your Mac: the entire process runs offline.
Drag one MEF file or an entire shoot folder into Convertessa. The app reads Mamiya's proprietary RAW data directly — no import step, no sidecar files needed.
Choose JPG from the output list, then set the quality level that fits your use case — high for archiving, lower for faster web delivery.
Click Convert. Convertessa processes every file locally, preserves the original resolution, strips EXIF metadata from the output, and saves the JPGs alongside your originals.
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.
JPG is a lossy format, so some data is discarded during encoding. Convertessa lets you set the quality level before conversion — choose a higher value to minimize visible loss and a lower value to reduce file size for web delivery.
Yes. Drop a folder of MEF files onto Convertessa and it batch-converts every image in one pass. You can also run convertessa ./shoot/ --to jpg from the terminal to process an entire directory.
No. Convertessa runs entirely on your Mac — MEF files are read and written locally and never leave your machine.