Your files stay on your Mac.
JPEG XL is a next-generation image format built for efficient encoding, but many professional tools — print pipelines, archiving systems, and image editors — expect TIFF. Convertessa decodes each .jxl file and writes a full-resolution TIFF, preserving every pixel without lossy re-encoding. Embedded metadata is stripped in the process, producing clean files ready to import wherever TIFF is accepted.
Drag one .jxl file or an entire folder into Convertessa. All files stay on your Mac — nothing is uploaded.
Pick TIFF from the output format list. Convertessa decodes each JPEG XL image and writes a full-resolution TIFF.
Click Convert. Your TIFF files appear alongside the originals in seconds, ready for print, archiving, or any tool that expects TIFF.
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. TIFF is a lossless format, so Convertessa decodes your JPEG XL image fully and writes every pixel intact — no image data is discarded during the conversion.
Yes. Drop a folder onto Convertessa or run convertessa ./photos --to tiff in your terminal. Every .jxl file in the folder is converted in one pass.
No. Convertessa strips embedded metadata from the output TIFF, keeping files clean for archiving or distribution without exposing camera or location data.