Your files stay on your Mac.
Convertessa reads your Nikon RAW (NRW) files and writes standard JPG images your Mac can open anywhere — no upload, no internet required. You control the quality level and can strip embedded EXIF metadata before the file is written to disk. Batch mode converts an entire folder in one pass.
Drag one NRW file or a whole folder into Convertessa. Conversion runs entirely offline — nothing leaves your Mac.
Pick JPG from the output format list, then set the quality level. Higher quality produces a larger file; lower quality produces a smaller one.
Click Convert. Convertessa writes JPG files at full resolution, optionally stripping EXIF metadata from each output file.
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. Convertessa preserves the full resolution of your NRW file when writing JPG. Only the format and, optionally, the quality level change.
Yes. Convertessa can strip embedded EXIF data — GPS coordinates, camera model, lens info — from every JPG it writes, leaving a clean output file.
Drop a folder onto Convertessa or run convertessa ./folder/ --to jpg in the terminal. Every NRW file in the folder is converted in one pass.