Your files stay on your Mac.
Convertessa reads each MKV container and renders its frames as a looping animated GIF. The result plays in every browser, messaging app, and image viewer that supports GIF—no video codec required on the receiving end. Everything runs locally; your footage never leaves the machine.
Drag one or more MKV files into Convertessa, or drop an entire folder to queue a batch at once.
Select GIF as the target format. Convertessa will render each clip's frames into a looping animated GIF ready for browsers and messaging apps.
Click Convert. Convertessa processes every file on-device and saves the GIFs alongside the originals—no upload, no server round-trip.
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 sets the GIF loop count to infinite, so the animation repeats in browsers, messaging apps, and image viewers that honour the loop flag.
Yes. Pass a folder path on the command line—convertessa /path/to/folder --to gif—or drop the folder onto Convertessa to queue every MKV inside it.
No. Convertessa converts MKV to GIF entirely on-device. No file is uploaded to any server at any point.