Your files stay on your Mac.
Convertessa reads each GIF frame-by-frame and packages the animation into a Matroska MKV video container. Every frame is written out at its original resolution. Because MKV is a lossy target you can set the output quality before the conversion runs.
Drag one GIF or an entire folder onto Convertessa. All files stay on your Mac — nothing is uploaded to any server.
Pick Matroska MKV from the output list. Set the quality level that fits your needs before moving on.
Click Convert. Convertessa processes every GIF and writes the resulting MKV files to your chosen output folder.
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. Convertessa reads every frame in the GIF and writes them all into the MKV container, preserving the full animation at its original resolution.
Yes. Before converting, set the quality level in Convertessa. Higher quality produces a larger file; lower quality produces a smaller one.
Yes — drag a folder onto Convertessa or pass the folder path on the command line: convertessa /path/to/folder --to mkv. Every GIF in the folder is converted in one run.