Your files stay on your Mac.
Converting MEF to TIFF unpacks Mamiya's proprietary RAW container into a lossless, universally-readable image file. The full sensor resolution is preserved — no compression artifacts, no data loss. The output TIFF drops embedded EXIF metadata, giving you a clean file ready for archiving, retouching, or print.
Drag individual MEF files or an entire shoot folder into Convertessa. Files never leave your Mac — no upload, no cloud.
Choose TIFF from the output format list. Because TIFF is lossless, no quality setting is needed — Convertessa preserves the full resolution of every frame.
Click Convert. Convertessa processes each MEF in parallel and writes a TIFF alongside the original. Batch jobs across whole folders finish in the same step.
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. TIFF is a lossless format, so Convertessa writes every pixel from the MEF sensor data without compression artifacts or quality degradation. What the camera captured is what you get.
Never. Convertessa runs entirely offline on your Mac. The MEF files are read and written locally — no network connection is required or used at any point.
Yes. Pass a folder path with convertessa ./folder --to tiff and Convertessa converts every MEF it finds, preserving your directory structure alongside the output files.