Your files stay on your Mac.
Converting MPEG to MP4 rewraps your video into the MPEG-4 container, the format expected by most modern players, devices, and streaming platforms. Convertessa runs every conversion locally on your Mac — no file is ever uploaded. Because MP4 is a lossy format, you can set output quality to tune the balance between file size and visual fidelity.
Drag one MPEG file or an entire folder onto Convertessa. The app queues .mpeg and .mpg files for conversion without uploading anything.
Choose MP4 from the output format list. Set quality if you want to control the trade-off between file size and visual fidelity.
Click Convert. Convertessa processes every queued file on your Mac and writes the finished MP4 files to your chosen destination 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 re-encodes the video stream into the MP4 container. Because MP4 is a lossy format you can set the quality level before converting — higher quality preserves more detail at the cost of a larger file.
Yes. Drop a folder onto Convertessa or run convertessa ./folder/ --to mp4 in the terminal to batch-convert every MPEG file inside it in one pass.
No. Convertessa runs entirely offline on your Mac. Your MPEG files are never sent to any server — conversion happens locally and the output stays on your machine.