Your files stay on your Mac.
Convertessa reads JPEG 2000 files and writes standard JPG images that every app, browser, and device already understands. Set the quality level to balance file size against sharpness, then convert a single file or a whole folder in one pass. Everything runs locally — no upload, no account, nothing leaves your Mac.
Drag one JP2 file or an entire folder into Convertessa. The app queues every file and shows a preview list before you convert.
Choose JPG from the output list. Set quality to dial in how sharp the exported images look versus how compact the files get.
Click Convert. Convertessa writes JPG files alongside the originals, strips EXIF metadata, and never uploads anything — all processing stays on your Mac.
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 detail is re-encoded on export. Convertessa's quality setting lets you keep sharpness high — a value of 85–95 is typically indistinguishable from the JP2 source at a much smaller file size.
Yes. Drop a folder onto Convertessa and every JPEG 2000 file inside is queued for conversion to JPG in one click. You can also use the CLI: convertessa ./folder/ --to jpg.
Yes. Convertessa strips EXIF and other embedded metadata from the output JPG files, so location, device, and author data are not carried over from the original JP2.