Your files stay on your Mac.
Hasselblad 3FR files store unprocessed sensor data captured by Hasselblad medium-format cameras. Converting to JPG renders that raw data into a universally compatible image ready for sharing, printing, or upload. Convertessa decodes each 3FR file entirely on your Mac — no internet connection required.
Drag individual .3fr files or an entire folder into Convertessa. All files queue for conversion in one pass — no limit on batch size.
Choose JPG from the output format list. Because JPG is a lossy format, you can set quality to balance file size against image fidelity before converting.
Click Convert. Convertessa processes every file locally on your Mac — your 3FR originals never leave your machine. EXIF metadata is stripped from each output JPG.
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 decodes the full sensor resolution of each 3FR file and writes it into the JPG output. No pixels are dropped during conversion.
Yes. Because JPG is a lossy format, Convertessa lets you set quality before converting. A higher quality value retains more image detail; a lower value produces smaller files.
No. Convertessa runs entirely offline on your Mac. Your 3FR files are read and written locally — they never leave your machine.