Your files stay on your Mac.
MP4 stores video in a modern container; converting to MPEG rewraps the stream into the MPEG-1/MPEG-2 format expected by legacy players, broadcast encoders, and older authoring pipelines. Convertessa runs the entire conversion on your Mac — no file is ever uploaded. Because MPEG uses lossy compression, you can set quality before exporting to balance file size against visual fidelity.
Drag one MP4 file or an entire folder of MP4 files onto Convertessa. Batch mode processes every file in the folder in a single pass.
Choose MPEG from the output format list. Set quality to control how aggressively the encoder compresses each frame.
Click Convert. Convertessa writes the MPEG files to your chosen output folder — all on-device, nothing uploaded, resolution preserved.
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.
No. Convertessa runs entirely on your Mac. MP4 files are read and written locally — nothing is sent to a server or the internet at any point.
Yes. Drop the folder onto Convertessa, or use the CLI: convertessa ./folder/ --to mpeg. Every MP4 in the folder is converted in one pass.
Yes. MPEG is a lossy format, so Convertessa lets you set quality before converting. A higher setting preserves more detail; a lower setting produces a smaller file.