Your files stay on your Mac.
Convertessa re-encodes your JPG files into HEIC — Apple's High Efficiency Image Container format — at the same resolution and colour depth. HEIC packs more detail into fewer bytes than JPG at comparable quality settings. Everything runs locally on your Mac; no file ever leaves the machine.
Drag one JPG or an entire folder onto Convertessa. Every JPG in the folder is queued automatically — no manual selection required.
Choose HEIC from the output format list. Optionally set quality to balance file size against image fidelity before conversion starts.
Click Convert. Convertessa writes HEIC files to your chosen destination, preserving the original resolution and stripping EXIF metadata from every 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.
Usually yes. HEIC's compression is more efficient than JPG, so a HEIC file at the same visual quality is typically 30–50% smaller. Use the quality setting to dial in your preferred size-versus-fidelity trade-off.
Yes. Convertessa strips all EXIF and embedded metadata from every HEIC file it produces. Your original JPGs are left untouched.
Yes. Drop a folder onto Convertessa and every JPG inside is queued for batch conversion. From the terminal: convertessa ./photos/ --to heic.