Your files stay on your Mac.
OpenEXR stores scene-linear HDR image data used in VFX and film pipelines. Convertessa reads each .exr file and encodes it as an AVIF you can share on the web or view on any modern device. The entire process runs locally on your Mac — nothing is uploaded.
Drag one .exr file or an entire folder of renders into Convertessa. Batch mode processes every OpenEXR in the folder in a single pass.
Pick AVIF from the output list. Because AVIF is lossy, you can set quality before converting to balance detail against file size.
Click Convert. Convertessa encodes each file on your Mac and strips embedded metadata from the output. Finished .avif files land next to your originals.
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. Because AVIF is a lossy format, Convertessa lets you set quality before encoding. Higher values preserve more detail; lower values produce smaller files.
Yes. Convertessa strips embedded metadata from every AVIF it produces, so deliverables do not carry internal production information from the source EXR.
Yes. Drop the folder into Convertessa or run convertessa ./renders/ --to avif in Terminal. Every .exr file in the folder is converted in one batch — no upload required.