Your files stay on your Mac.
Convertessa reads the video and audio streams inside your Matroska MKV container and re-encodes them into an MPEG file compatible with TVs, media players, and editing tools. Output quality is yours to set — MPEG is a lossy format, so the slider lets you balance file size against visual fidelity. Every file stays on your Mac; nothing is uploaded or sent to a server.
Drag one MKV file or an entire folder onto the Convertessa window. Batch mode processes every file in a single pass without any extra steps.
Choose MPEG from the output format list, then set the quality level to control the trade-off between file size and visual fidelity.
Click Convert. Convertessa encodes each MKV locally, preserves the original resolution, and writes the MPEG files alongside your source files.
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.
MPEG is a lossy format, so some re-encoding happens. Convertessa exposes a quality setting before the conversion runs — choose a higher value to minimise visible degradation at the cost of a larger output file.
No. Convertessa preserves the original resolution of every MKV file when writing the MPEG output.
Yes. Drop a folder onto Convertessa or run the CLI batch command — every MKV file in the folder is converted to MPEG in one pass, with no per-file configuration needed.