Your files stay on your Mac.
GIMP XCF is a working-project format that stores layers, channels, and paths — it is not suited for sharing or the web. Converting to AVIF merges all layers into a single composite image and encodes it in a modern format with strong compression at high visual quality. The conversion runs entirely on your Mac; no files are uploaded anywhere.
Drag individual XCF files or an entire folder into Convertessa. Batch mode processes every XCF file in the folder in one pass.
Choose AVIF from the output format list. Optionally set quality to control the trade-off between file size and visual fidelity. EXIF and embedded metadata are stripped automatically.
Click Convert. Your AVIF files are saved alongside the originals — or to a destination folder you choose. The originals are never modified.
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.
AVIF is a flat image format. Convertessa flattens all XCF layers into a single composite image before encoding. Layer data, paths, and channels from the original XCF are not carried over to the output file.
Yes. Because AVIF is a lossy format, you can set quality before converting. Higher quality values preserve more detail; lower values produce smaller files. The default setting targets a good balance between size and fidelity.
No. Convertessa runs entirely offline. XCF files are processed locally on your Mac and are never uploaded to any server.