Your files stay on your Mac.
Convertessa reads your AVIF files and writes WebP images at the same resolution, using the quality level you set. WebP has near-universal browser and app support, so the output works wherever AVIF doesn't. Every file stays on your Mac—nothing is uploaded.
Drag one AVIF file or an entire folder onto Convertessa. Batch mode processes every AVIF in the folder in a single pass.
Pick WebP from the output format list. Use the quality slider to balance file size against visual fidelity—the default produces sharp, web-ready images.
Click Convert. Convertessa writes WebP files next to your originals and strips EXIF and embedded 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.
Both AVIF and WebP are lossy formats, so re-encoding introduces a small quality cost. Use the quality slider to set the WebP output level explicitly—higher values preserve more detail at the cost of a larger file.
Yes. Drop the folder onto Convertessa or run convertessa ./folder/ --to webp in your terminal. Every AVIF file in the folder is converted in one pass.
Yes. Convertessa strips EXIF and other embedded metadata from every WebP file it produces, keeping output clean for web publishing.