Your files stay on your Mac.
OpenEXR stores high dynamic range image data as floating-point pixels—ideal for VFX pipelines but oversized for web or review. Convertessa reads those values and writes a standard 8-bit JPG, preserving the original resolution. Your files never leave the Mac.
Drag a single .exr file or an entire render folder onto Convertessa. The app reads all OpenEXR variants locally—no upload, no account required.
Choose JPG from the output list and set the quality slider to balance file size against image detail.
Convertessa maps the floating-point HDR data to 8-bit, strips metadata, and writes each JPG alongside your originals. Resolution is preserved.
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 runs entirely on your Mac. Your .exr files are read and written locally—nothing is sent to a server or the cloud.
Yes. Drop the render folder onto Convertessa or run convertessa renders/ --to jpg in the terminal to convert every OpenEXR in the folder in one pass.
No. Convertessa strips metadata during conversion, so the output JPG contains no embedded channel data, custom attributes, or other EXR-specific fields.